Poor Xen Performance
Nov 7, 2009
I have been working with Xen over the last week or so and I can't figure out why the performance is downgraded so much when booting into Xen. There are certain things that seem just as fast but other things just don't seem normal.
I have tried this on two different quad-core systems, one new generation (York) with CentOS5 and one old (Kent) with Debian Lenny but neither seem to produce good speeds.
For example, when I use the default kernels I can usually get about ~600 score out of unixbench-wht and things such as top and core systems show up as 0% cpu when running top.
When I boot into Xen kernel however, whether it been from Dom0 or the guest OS, top uses about 3% CPU and unixbench-wht produces scores under 250.
I have set vcpus to 4 and have even tried vcpu-pin 0 0, 1 1, 2 2, 3 3 but nothing seems to be changing anything. The disk speeds seem about the same (hdparm). I'm assuming it is something with the CPU,
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Nov 20, 2007
I have two netscreen 25 firewalls linked together via an ethernet cable.
If I connect the ethernet cable to switches I get around 90Mbps. However, if I connect the firewalls together I barely get more than 30Mbps (25Mbps average using iperf). All rules are set to talk to each other and the setup works, but I don't understand where the speed has gone.
The firewall ports and firewall performance per port is rated at 100Mbps and there is little traffic on the other network ports. I have both interfaces set to auto neg duplex as if set to 100 full I get even worse performance.
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Jan 4, 2008
I have read on this forums and google CSF seem to be the best firewall out there, so i installed it configure and run it. After the installation i found that i received a lot time out error on web service. Page take a lot longer to load. I think it's my configuration.
Can someone take a look at my configuration if possible please share your configuration. I really like to have CSF run without poor performance on web service.
TESTING = "0"
TESTING_INTERVAL = "5"
AUTO_UPDATES = "1"
ETH_DEVICE = "eth1"
ETH_DEVICE_SKIP = ""
TCP_IN = "20,21,22,25,53,80,110,143,443,465,953,993,995,2077,2078,2082,2083,2086,2087,2095,2096,8184"
TCP_OUT = "20,21,22,25,37,43,53,80,110,113,443,587,873,953,2087,2089,2703"
UDP_IN = "20,21,53,953"
UDP_OUT = "20,21,53,113,123,873,953,6277"
ICMP_IN = "1"
ICMP_OUT = "0"
SMTP_BLOCK = "1"
SMTP_ALLOWLOCAL = "0"
MONOLITHIC_KERNEL = "0"
DROP = "DROP"
DROP_LOGGING = "1"
DROP_IP_LOGGING = "1"
DROP_ONLYRES = "0"
DROP_NOLOG = "67,68,111,113,135:139,445,513,520"
PACKET_FILTER = "1"
DROP_PF_LOGGING = "0"
VERBOSE = "1"
SYSLOG = "0"
DYNDNS = "0"
RELAYHOSTS = "1"
DENY_IP_LIMIT = "100"
GLOBAL_ALLOW = ""
GLOBAL_DENY = ""
GLOBAL_IGNORE = ""
LF_GLOBAL = ""
LF_DAEMON = "1"
LF_TRIGGER = "0"
LF_TRIGGER_PERM = "1"
LF_SELECT = "1"
LF_SSHD = "3"
LF_SSHD_PERM = "1"
LF_FTPD = "3"
LF_FTPD_PERM = "1"
LF_SMTPAUTH = "3"
LF_SMTPAUTH_PERM = "1"
LF_POP3D = "5"
LF_POP3D_PERM = "1"
LF_IMAPD = "5"
LF_IMAPD_PERM = "1"
LF_HTACCESS = "5"
LF_HTACCESS_PERM = "300"
LF_MODSEC = "0"
LF_MODSEC_PERM = "1"
LF_CPANEL = "3"
LF_CPANEL_PERM = "3600"
LF_CSF = "1"
LF_SSH_EMAIL_ALERT = "1"
LF_SU_EMAIL_ALERT = "1"
LF_SCRIPT_ALERT = "1"
LF_SCRIPT_LIMIT = "100"
LF_SCRIPT_PERM = "0"
LF_DIRWATCH = "60"
LF_DIRWATCH_DISABLE = "1"
LF_DIRWATCH_FILE = "1"
LF_INTEGRITY = "3600"
LF_INTERVAL = "300"
LF_PARSE = "5"
LF_EMAIL_ALERT = "1"
LT_EMAIL_ALERT = "1"
LT_POP3D = "60"
LT_IMAPD = "0"
RT_RELAY_ALERT = "1"
RT_RELAY_LIMIT = "100"
RT_RELAY_BLOCK = "0"
RT_AUTHRELAY_ALERT = "1"
RT_AUTHRELAY_LIMIT = "100"
RT_AUTHRELAY_BLOCK = "0"
RT_POPRELAY_ALERT = "1"
RT_POPRELAY_LIMIT = "100"
RT_POPRELAY_BLOCK = "0"
RT_LOCALRELAY_ALERT = "1"
RT_LOCALRELAY_LIMIT = "100"
RT_LOCALRELAY_BLOCK = "0"
LF_DSHIELD = "86400"
LF_DSHIELD_URL = [url]
LF_SPAMHAUS = "86400"
LF_SPAMHAUS_URL = [url]
LF_BOGON = "86400"
LF_BOGON_URL = [url]
CT_LIMIT = "300"
CT_INTERVAL = "60"
CT_EMAIL_ALERT = "1"
CT_PERMANENT = "1"
CT_BLOCK_TIME = "1800"
CT_SKIP_TIME_WAIT = "0"
CT_STATES = ""
PT_LIMIT = "30"
PT_INTERVAL = "60"
PT_SKIP_HTTP = "0"
PT_USERPROC = "8"
PT_USERMEM = "100"
PT_USERTIME = "1800"
PT_USERKILL = "0"
PT_LOAD = "30"
PT_LOAD_AVG = "5"
PT_LOAD_LEVEL = "6"
PT_LOAD_SKIP = "3600"
PT_SMTP = "0"
IPTABLES = "/sbin/iptables"
MODPROBE = "/sbin/modprobe"
IFCONFIG = "/sbin/ifconfig"
SENDMAIL = "/usr/sbin/sendmail"
NETSTAT = "/bin/netstat"
PS = "/bin/ps"
FUSER = "/sbin/fuser"
VMSTAT = "/usr/bin/vmstat"
LS = "/bin/ls"
MD5SUM = "/usr/bin/md5sum"
TAR = "/bin/tar"
CHATTR = "/usr/bin/chattr"
HTACCESS_LOG = "/usr/local/apache/logs/error_log"
MODSEC_LOG = "/usr/local/apache/logs/error_log"
SSHD_LOG = "/var/log/secure"
SU_LOG = "/var/log/secure"
FTPD_LOG = "/var/log/messages"
SMTPAUTH_LOG = "/var/log/exim_mainlog"
SMTPRELAY_LOG = "/var/log/exim_mainlog"
POP3D_LOG = "/var/log/maillog"
IMAPD_LOG = "/var/log/maillog"
CPANEL_LOG = "/usr/local/cpanel/logs/login_log"
SCRIPT_LOG = "/var/log/exim_mainlog"
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Jan 4, 2007
I've got some hardware based on SuperMicro PDSMi and trying to run CentOS 4.4 on it.
It all installs fine however Disk Performance is extremely poor:
hdparm -t /dev/hda
/dev/hda:
Timing buffered disk reads: 12 MB in 3.30 seconds = 3.64 MB/sec
hdparm shows the hard drive is running in funny mode:
/dev/hda:
multcount = 16 (on)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 0 (off)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 20023/255/63, sectors = 164696555520, start = 0
And strange thing DMA can't be enabled:
hdparm -d1 /dev/hda
/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
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Jul 13, 2007
I am using dreamhost host 3 of my web sites and 1 blog. Dreamhost is great, offers alot space and bandwidth.
but I think they are oversellling their space, sometimes it gets really slow. (overselling ? ok, I dont really know, but sometimes its really slow, and most my asian readers said need to refresh to load the page. I am wondering if theres a way to check if they are overselling or not.)
I am thinking about buying vps, even tho, I still got 5 month left with dreamhost.
I found 2 vps companies are highly recommanded on this forum, JaguarPC and LiquidWeb.
theres already a post compared both companies in terms of price and service. I say I will pick JagarPc, cuz, its basic plan just 20 USD, and htey got promotion now, its even cheaper. and basic Liquidweb vps plan is 60 bucks.
I am wondering why Jagarpc is so cheap , are they overselling? how can we check if they are overselling.
I found a few posts saying how good jaguarPc is. and they are not overselling, but those members just signed up this month, and only have 1-3 posts. I cannot really trust those new members.
Can someone share their experience with JaguarPC? compare JaguarPc performance and liquidweb performance. antoher question is switch from dreamhost to JaguarPC basic vPS plan, will performance gets better?
last question: VPS account allows 3 IP, 3ip = 3 domains? if not, how many domains can I have?
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Aug 4, 2009
I signed up for a VPS at UltraVPS using their promotional coupon and special offer posted on WHT.
First- it took them 7 hours to activate my account, after bugging them.
Second- it takes them nearly 7 hours to respond to a support ticket.
Third- I am unable to login into the VPS control panel nor the FTP using the login information they have provided. I am not a newbie in hosting, I have several different VPS accounts.
It seems like this is a one-man operation.....
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Jun 3, 2008
I met these guys through this website and they promised me exactly what I was looking for... a fast, responsive web host with PHP5, MySQL and 5GB - 10GB of storage. I was previously with HostDepartment and they obviously oversell... my site load times were counted in minutes. Anyways, things started great for the first two weeks... the site was always up and clients were amazed at the speed and performance of the site. I considered bringing over 7 other "business" websites because the performance was so great.
Then about 3 weeks ago... the site went offline. It's the internet, stuff happens...
DDoS attacks, DNS conflicts, Server Upgrades, someone trips on the power cord, whatever. I file a ticket and the site is back up in about an hour or two. So, i forget about it. Few days later, its down again... for a LONG period of time... multiple hours.
I file another ticket and I'm told they are in the process of mitigating a DDoS attack.
The outage then starts showing a pattern.. my site will be up late in the evening and early in the morning... but from 11amCST to about 11pmCST.. its unavailable. After another day, I contact them and they say they are still being assaulted by DDoS but they have put measures in place to correct it... that was at the end of May. My site has been down for 2 days straight.. since around 11am CST on June 1st. I came online briefly during the morning of June 2nd... but went back offline around 11am on the second and has never returned. The previously quick responses to my tickets have been non-existant now... I have yet to hear a response to my ticket from June 1st.. I did add a note to it once a day at 11am for the purpose of tracking that the site was still down. I understand that may move it to the end of the queue... but it has been updated once a day, so there was plenty of time between updates to see it.
I highly advise to avoid these guys... I wasn't going to write this until I could access to my site again for fear of losing my database info... but at this point, it seems like my sites are already lost.
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Mar 30, 2008
I had read a lot of good things on these forums about ASmallOrange. So I finally decided to sign up with them for my friend's website which I manage & design.
Unfortunately my experience was anything but good. The issue was that I am based in India & I design my friend's website who is based in the US. Since my friend is a non tech savvy person he gave me his credit card number and asked me to manage everything from signing up for a new web host to designing the site.
Since ASmallOrange's billing department found that the address is registered based in USA but the IP address of the person signing up was not from USA, they marked the account as fraud.
I must say that I very well appreciate this system of fraud detection followed by them & am very much impressed by it. What I was not impressed with was the fact that they didn't bother to inform me about the same nor did they try to verify the authenticity of the account. Unaware of this, me & my friend kept waiting for more than 24 hours for my account to get activated. It was only when I raised a support ticket that they informed me that my account has been marked as fraud.
Subsequent to this I informed them about the circumstances under which this account was signed up & asked them to carry out whatever verifications they need to do with the end client or through the credit card company.
To my surprise again there was no reply from their end & this morning I find that my support thread was closed without reverting on the issue.
I guess its time for me to move on and host somewhere else. My own websites are hosted with Dotable and am very happy with them.
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Dec 20, 2008
Does any one know what's up with solidhost?
I have a VPS plan with them that includes 6 dedicated IP's. they have only issused me 2 so I have asked them to issues 2 more. I have sent about 10 emails to their billing department (which handles this) and no one has responded. The technical department is replying to me but only in regards to technical prblems.
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Jun 3, 2008
I would like to start off by saying M8 has always maintained an excellent uptime, HOWEVER, support has been a nightmare to work with and responses take forever. What prompted me to send this was our sites have been down for over 3 hours so far and you cannot contact anyone by phone and when you email there is no response.
After realizing that a response was going to take a while we decided to try a few things on our own and It appears as though we have been blocked by their firewall or something because we can access the sites via a anonymous proxy. We are still waiting for this issue to be fixed.
Why were we blocked ? Read on
We asked them about a week ago to update our instance of Sugar CRM and we told them that shortly we will be moving another domain to them and when we do this we will want to move our version of sugar.
They did the upgrade (again, response time was horrible), when it was done we went to our URL and found that it had never been updated. I asked them about this and I found out that they moved it to a new service and that the url we were using would not work with all the scripts I had running.
I accepted that and said fine, no problem, we will get our new domain over there and everything will be good. The only problem I had with this is now we are forced to move this stuff right away because our request was not done the way it should have been. Please note, we paid them $100 to update our Sugar version which is no problem…
I started to get ready to move our data and could not connect via FTP, I entered a ticket and a LONG wait later I get the reply, to login to your control panel do this. Needless to say that is NOT what I needed. I needed to know how to login via ftp because all attempts would not work. Keep in mind, that we also upgraded our plan with them.
Anyway, it appears that because we tried to FTP in so many times we have been blocked, however, this would not have been the case if they had answered our support question in a reasonable amount of time… My one contact there when you send him emails comes back with
Hi. This is the qmail-send program at m8solutions.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
<REMOVED FOR PRIVACY>
user is over quota
--- Enclosed are the original headers of the message.
Can anyone please help with hsphere and how to FTP because apparently they are not going to help and now my entire office is unable to do any work because we cannot access our stuff…
Please note, I am a very patient person, but when it takes days to get an answer to a simple question and we are spending more money with them I lose my patience. I do not like to bash any company because we all have our problems, but this is crazy…
We let them know that we were going to do a post on WHT and still no response back. I feel horrible about posting this and will update you once this has been resolved..
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Jun 11, 2008
About a month ago I transferred a live site from a host to siteground as they supported all the functions I needed. I could have transferred the site myself, but to help convince to move to siteground promised me a free no downtime guaranteed transfer (which apparently is company policy) So I let them do it. There was downtime during the transfer but not a big deal I was ok with that But then a few days later my site went down big time. Someone called me to tell me it was down and I didn't have access to a computer so I called siteground. The operator (besides having trouble understanding english) wouldn't even report that my site was down to support!! Finally I get back to the computer and report it myself. Their 15 min or less turned out to be about 45 Then when I ask if I am going to be compensated for the extreme amount of downtime like the promise but I get turned down at every turn the excuse being technically it was downtime because it loaded a blank page STILL downtime in my book since it was siteground's fault I hadn't touched it. To add injury upon insult my site that ran perfectly smooth before has numerous problems. Every time I submitted a ticket they either tried to make it sound like it was my fault (again I hadn't touched it) or gave me the "normally this is a paid service but we made an exception for you" line as if I would need the service if they hadn't messed up the transfer. My overall experience with their service left me disgusted. Not to mention when I cancelled the "guaranteed money back" withholds nearly 4 months worth of the year I paid in advance. I have since transferred the SAME site MYSELF to atechosting and now have had it running for a few days there and had no downtime during transfer or a single problem since.
I will say performance wise they were fine even though their was some 169 on my server.
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Apr 14, 2007
I finally ditched Site5 at a host. So _anything_ should be better, right?
After only a week or so with ServInt I'm wondering if I made the wrong decision.
Now I thought a few hours resolution time with Site5 was frusterating, try waiting 6 hours, or 18 (my current ticket, still not resolved, with no reply after asking for an update several hours ago).
And having a tech answer the phone doesn't help much either if they don't have a clue how to troubleshoot.
First the tech insists that MX records need to be pointed to my host for OUTGOING smtp to work!
Then after sending him the necessary log files twice, he still insists I'm not giving him enough information to fix the problem and that MX records must be setup. When I call and ask if he read the log file snippets I had sent him, "no" was the answer! AAAAAARGH!
And then being told many times, that the problems been fixed. And then finding out it's not and that they never even TESTED IT before saying so!
Is it time to pack up and leave before I migrate all my customers there?
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Jun 29, 2009
Im getting the following error:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
email@shaw.ca
SMTP error from remote mail server after initial connection:
host idcmail.shaw.ca [24.71.223.11]: 554-idcmail.shaw.ca
554 Your connection from IP has been rejected due to poor reputation
.....
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May 10, 2009
I have been lurker for long time already but now decided to ask this question I have been wondering about past few months.
I rent an dedicated server from KeyWeb, with dedicated 100mbps link. The server itself isn't that good & fast, but it's just perfect for my gaming server (E4500, 2GB DDR-2 ram and 2 x 320GB sata 2 drives)
Now to the problem. Always when I download some big files with this server from ftp or html server, and if I only open one connection, speed is very poor... Like 1MB/s or so, but if I use some download manager or torrent client which opens more than just one connection, +10 or so... Then the speed is very good, sometimes it goes up to 15MB/s. The server is actually connected to 1gbps switch but I think the port is limited to 100mbps.
At speedtest (dot) net, I get results like 17mbps down and 8mbps down.
So... Is that normal or is there something wrong? I've not contacted them yet, but if this isn't normal. I will Ofcourse I'll try to solve this on my own.
and before someone asks if this ftp I'm downloading from is not fast enough... I can tell you, it's. I downloaded one big file from it at school and at max speed was about 9MB/s
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Jun 30, 2008
Today we have been very badly handled by iweb night support team.
The server went down and still down,
They did not answered phone and also did not update us for problem status. They kept saying the admin is working on the issue.
They asked root password and who knows what they are doing with it.
We are moving our accounts from their data center as we speak.
They employ irresponsible and incapable people and not trusted any longer.
Netelligent.ca is highly recommended for the ones looking for canadian dedicated server at the moment
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Feb 7, 2007
I have had major problems with connecting to my shared hosting space from my home. Sometimes I can only view one page before it times out and other times I can not view any pages.
I have tried tracert, which seemed fine and there is no problem accessing the IP from any other location, only my house.
Has anyone got any ideas of what I could do? If I can not figure it out I am either going to have to get another ISP or move all my web sites.
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Jul 15, 2006
I don't have a problem with Bluehost, but after getting this email tonight I would have thought that it's not that hard to have enough fuel and a big enough generator to last more than five minutes after a power outage. It seems like pretty poor redundancy planning if a major host can't last more then five minutes with no power. Hospitals and other places don't have any problem doing it with similar or bigger power demands.
Dear Bluehost Customer,
This evening (July 14th) from about 5:25pm-6:55pm many of our servers
were offline causing significant downtime for many of our users. The
outage was due to a severe power outage in the north end of Orem, Utah
where our servers are located. We do have UPS backup as well as diesel
generators, but at about 5:30 they finally gave out. The power outage
was for much longer than that period of time, but the reserve power
was eventually consumed in its entirety. When it rains it pours.
For users on box65-box145 there have been periodic problems with the
Redhat linux kernel that we were using that was causing problems with
the filesystem that your data is stored on. This issue has been causing
periodic problems for users on those boxes. In the last few days we have
resolved that issue which also caused those boxes to require a reboot.
The downtime is extremely regretable. We apologize profusely for the
inconvenience to our customers and in turn to those who were trying to visit
your sites during the outage. With the fixes we have put in place in the
last few days coupled with other upgrades you should experience MUCH
better uptime in the future.
Thanks for you patience,
Matt Heaton / President Bluehost.com
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Feb 2, 2009
Why has Ipower turned into a such a poor hosting service? I have been with them for years and now they are leaving me little choice, but to find a new provider. For years they were able to provide me with a smooth service. Over the last year I have experienced tons of down time, long wait time for customer service, and recently downed email service for way toooo long.
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Nov 24, 2006
I'll second what is said about Lunarpages. They are an absmal McHost whose priority is to lure in as many customers as possible without bothering about the quality of their service. I challenge anybody to ring their telephone support line and see if somebody picks it up. I have tried to call ten times in the last six months and never been able to get through once, despite hanging on for ages.
Just today my entire website was down because Lunarpages moved it to a new server (without asking me) and screwed up. The website, Azam.biz has over 17,000 references to it in Google and is critical to my business. I sat drowing in sweat for hours. I couldn't get hold of anybody at Lunarpages by telephone or live chat and the one support response I received ws addressing an unrelated issue.
Worse thing of the lot is Lunarpages censors criticism them on their forums more so than any webhost I have ever know. Every time I post a comment about downtime or not being able to get hold of anybody on the telephone, they delete the post saying it is "incorrect". I have never met a company with such a Stalinesque censorship policy.
I have feared posting anything negative about Lunarpages on other forums because I've been worried about them closing down my account. But, after having suffered so much stress because of them today, I don't care any more.
I am going to back up by entire site now, because I'm worried they will close down my account after reading this. They are not the type of company to take on board criticism and use it to improve their offerings; their obsession is to stifle any criticism.
I am now suffering pain in my heart for the first time in my life because of how badly Lunarpages have treated me today. Their arrogance shows no bounds - they are smug, full of hype and don't give a damn about ruining customers' businesses.
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Oct 7, 2009
I have seen number of web host with poor performance gain allot of sales.
number of ppl complaining on wht about such host.
I wonder how come customer go there, and how come they have such large sales, on other hand I saw some quality web host with fewer clients?
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Feb 2, 2009
I had 2 annual accounts with joeusa.com for my website hosting (2 websites). I was a 3-year customer, somewhat disatisfied with tech support service but without time to change hosting servers. My email quit receiving on one website/account about 2 weeks ago. Joe told me they had changed out a hosting server & that was likely the issue. I continued to have no email with Joe being evasive & nonhelpful. Upon logging into the control panel, I noted I was blocked out. I finally got him to agree to check on it, & he stated that the host spam blockers were not activated, & there was too much spam. I had made no changes, so the spam blockers had to be deactivated when they changed servers with no notification to me.
Joe shut down both of my accounts refusing me a prorated refund. I had paid one on Sept. 6 through PayPal for 1 year & the other on Nov. 6 through PayPal, also for a year. I was told by PayPal that they do not cover services, so FYI on PayPal, buyer beware. Joe gave me 24 hours to take my websites down. He also wiped out all of my email that was on the server that I had not been able to receive for the last 2 weeks & I lost all of it with no access to it.
I have email proof of what transpired & only want a prorated refund, what is fair, because I have not received near the full year service purchased for both accounts. He has refused, and I am considering filing fraud charges. My email documentation shows how a simple tech support issue turned into his cheating me out of my money when he cancelled both services & refused any prorated refund.
I have no idea why he has acted so vindictively, including wiping all non-spam email off the server that I was never able to receive, but, based on some of his comments, I believe that he either did not like our Judeo-Christian website or that he had been reading some of my personal email with political comments in the recent election. He was not even aware of my 2nd account until I made him aware that there were two, but he was aware of the ministry website/account, where the email issues were. The other account had no issues, but he cancelled both. Also, the Judeo-Christian ministry website had been hacked on his server by someone alleging to be Islamic about a year ago.
I am not making this report in vengeance. I am only trying to keep the same thing from happening to other consumers. This is a low-bid hosting company, and, once again the old adage, "You get what you pay for," is proven true.
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Sep 7, 2008
We run a very busy web application written in .net . The backend is SQL 2005. The server running SQL for this web app is slammed constantly. CPU is red lined, and the disks are queuing up because they cant keep up with the demand. What I am wondering is what do the big websites do to gain performance? What direction should we start moving in to get ahead of the curve. We are using an HP DL 580 with 4 x quad core xeons and the fastest SAS drives we could get.
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May 12, 2008
Any rumors known already?
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Dec 10, 2007
Does anyone have experience using LVM2? We'd rely on hardware RAID mirroring for the underlying physical redundancy, but we're very interested in LVM2's storage virtualization features.
If anyone can share their experiences with LVM2 with regards to performance and possibly use in a SAN environment,
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Apr 20, 2007
Hypothetical Scenario:
Let's say I've got a single website built in Drupal (using PHP and MySQL). It gets less than a 1,000 visits per day and needs very little storage or bandwidth. The site is currently on a shared host and it runs okay, but often has very slow page loads due to sluggish MySQL calls and other traffic on the server. Sometimes the homepage loads in 2s but other times it takes 20-30s depending on time of day. The client is sick of this performance on such a low traffic site and wants to improve the situation.
Question: Will a VPS really provide that much better performance than a shared host?
Remember I'm talking ONLY about page load time under minimal load. No need to take into account scaling or Digg/Slashdot effects.
I know dedicated is the best option but it seems crazy for such a low traffic site. A lot of the VPS offers are very attractive in theory (managed and affordable) but in practice I'm concerned that even a 512MB VPS with 1GB burst won't make much of a performance difference.
Mainly I don't want to go to the hassle and extra monthly expense of moving everything to a VPS for only a minimal gain.
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May 2, 2007
We shifted one website based on Article Dashboard (its an article directory script coded in Zend) to a Godaddy VPS ($35 per month) from a shared hosting account with hostgator.
This VPS is really slow compared to hostgator account.
Can anyone tell what we should do?
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Sep 30, 2009
Im planning on buying a NAS from my provider for using as a backend to my VPSes (around 15). The plan is to put the server images on the NAS so the VPSes can be moved without interruption between different nodes.
The server i have looked on so far is the following:
CPU: Xeon 3330 2,67Ghz
RAM: 4GB DDR2
HDD: 8*Barracuda 7200.12 1000GB, 7200rpm, 32MB, SATA-II
RAID: 3Ware 9650SE
Network: Intel 2*1Gbit
Would it be enough to fill the Gbit-line?
The budget is pretty tight so if it's possible to do this with SATA drives it would be great, otherwise it could be a possibilty to go down in diskspace and switch the SATA drives to SCSI/SAS drives.
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Apr 12, 2009
We are getting into VPS hosting and wanted to get some opinions and feedback as we're quite unsure on what to expect as for performance and how many clients we can generally keep on a box.
For now we've bought 3 dell R710 with dual Xeon L5520, 72GB ram and 8 x 2.5" SAS drives.
We are thinking of a base offering of 512 megabytes of ram and
was hoping to get about 40-50 onto a server.
With 40 there should be -plenty- free ram and plenty drivecache.
Then a next offering of 1 gig ram and next one of 2 gigs.
Even if we do the biggest 2 gig offering with 25 on a server we should have free ram to spare.
The software would be virtuozzo.
Any thoughts on this, am I expecting too much, or am I being fairly realistic?
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Feb 7, 2009
I have to leave the Supermicro servers and use only Dell. I have this question.
There is a big difference in performance between these two RAID configurations?
Dell - 2 x 1TB RAID1 PERC6
Supermicro - 4 x 500GB RAID10 3ware 4 port
It is for use with webhosting.
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Nov 6, 2009
I need some advice on my situaton at my host, and possibly some frame of reference as to what can/should be expected from a VPS setup like mine and what I can expect it to manage.
I have a site that sees some traffic of about 150k pageviews per day. On any given day, it peaks for roughly a timespan of 4 hours per day where there may be about 5 req/s.
I use a standard setup (LAMP) running mod_php in Apache, not fast cgi. I have a VPS on Virtuozzos Power Panel that has 1,5 GB RAM and really an unkonwn amount of CPU. I haven't been able to ascertain that information but probably could if I asked my host.
The problem is that during these hours it gets a bit slow from time to time. Running TOP shows sometimes a staggering amount of waiting processes i.e. the load is quite high (15 - 25).
So, I'm now really at a fork in the road where I either start looking into going with a different setup, say Nginx + PHP-FPM (FCGI) and try to see if that makes a difference. I'm not really an admin so I would be kind of lost on that. I could also start looking into my code to see if I can cache more or do smarter stuff etc.
However, before doing any of the above, I'd like to ask this crowd here if you think that I've sort of hit the roof on what can be expected from a VPS of the size I just told you about. That my situation is quite normal and that the real solution is actually just to upgrade my VPS. Is it?
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Apr 14, 2009
Lets assume that we (me and the people I'm working with) were to launch a really powerful website. Then all of a sudden there is more demand for the website than the backend infrastructure can handle.
What do we do?
- 1000 users (ok so one powerful server should be enough).
- 2000 users (lets setup an additional server to work as the HTTP while the powerful server acts as the database only).
- 3000 users (lets eliminate all the commercial linux programs and install a fresh version of linux on both boxes and compile only the programs we need).
- 5000 (lets setup another server that handles the sessions).
- 6000 (lets setup a static-only server to deliver the non-dynamic content).
- 7000 (lets do some caching ... ugh maybe it won't be enough).
Any greater and what? We've run out of ideas on how to separate the code logic and how to optimize every byte of data on the website! What do we do? We can buy more servers, but how do we balance the load?
This is where I'm stuck at. In the past I've separated the load in a modular sense (one server does this and one server does that), but eventually I'll come across a wall.
how clustering works? What I wanna know is how is the information, whether it be the server-side code or the static information, is shared across machines. Is it worth it anymore to learn these things, or is it worth it just to host with a scalable hosting solution like AWS?
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