ISCSI As Centralized Hosting - Performance
Feb 2, 2008
Iīm thinking about using a centralized hosting solution, in order to achieve better redundance and performance while having more room to expand if necessary. In order to achieve this, I was thinking about implementing a storage server, and use a software to provide iSCSI target capabilities.
As storage server, I was thinking about using HP DL320s ( URL ), loaded with 12 147GB SAS HDīs 15K RPM. I will make some tests to understand the real difference between RAID5 and RAID10, concerning write speed. Also, Iīm not sure if the controller provided with this server is good enough to provide a reliable operation.
For switching, I will use HP 2824 or 2848 Gigabit switch, and use port trunk in order to join both NIC controllers of the storage server.
As iSCSI target software, I still donīt know wich one to use. I think FalconStor would be a good bet, however it seems to be a bit expensive. Any good alternative?
This storage server would be used to provide storage for about 10 "regular" hosting servers, that have, at the moment, regular dual 10K SATA Drives (Raptor) in RAID1. I'm afraid the 2x Gigabit ports arenīt enough, even considering that I will not have intensive sequential reads / writes, but random acceses.
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Apr 29, 2008
I am using Cpanel version 11 with Centos4.
Is there any address book option in existing email system like exim.there is any centralized address book facility which is globally accessible.
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May 21, 2007
I have almost 300 sites on one of my server, and its a pain in the *** to get every statistics on each cpanel admin... so what I need.. is a centralized webalizer/analog utily/addon/module to get all stats on one page... i meant stats from all the 300 domains in only that page... so that way i will avoid jumping between cpanels admins to watch the stats...
Does anyone know something like that for a cPanel server with RHEL 4
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Jun 14, 2008
I'd like to get your recommendations on how I should approach this problem. I posted this in another part of the forum, but I feel that this is a more appropriate place for it.
Problem:
How to handle large amounts of traffic with for a social network website? If a user uploads a photo or video, how does it become accessible on all of the server? If traffic is expected to be about 500,000 visitors a day, how many machines do you think I should use?
Possible Solution:
I've come up with the following possible infrastructure.
One load balancer. The load balancer has 3 PHP/Apache servers behind it. Behind each of the PHP/Apache servers is a (slave) MySQL server, from which data is read. Behind the slave MySQL servers, there is 1 master MySQL server, which handles all of the database writes. The master MySQL and slave MySQL servers are synced up, so data is up to date.
The actual photo and video files are not stored in the database, only the links to them is stored in the database (to keep the database small). The photo and video reside in a central location (like a SAN or NAS), which is accessible by all of the 3 PHP/Apache webservers.
Questions:
1. How many machines do you think will be able to handle photo and video uploads for 500,000 visitors a day?
2. Is having a SAN with Terabytes of RAIDED disk space an available option?
3. If a SAN or NAS is not an option, does anyone have any ideas on how to make sure all of the web servers have access to the same photos and videos? Is rsync a viable solution?
4. Which hosting provider do you think I should go with?
5. Is clustering what I need? What is clustering and how will it address my concerns?
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Jun 14, 2008
I'd like to get your recommendations on how I should approach this problem.
Problem:
How to handle large amounts of traffic with for a social network website? If a user uploads a photo or video, how does it become accessible on all of the server? If traffic is expected to be about 500,000 visitors a day, how many machines do you think I should use?
Possible Solution:
I've come up with the following possible infrastructure.
One load balancer. The load balancer has 3 PHP/Apache servers behind it. Behind each of the PHP/Apache servers is a (slave) MySQL server, from which data is read. Behind the slave MySQL servers, there is 1 master MySQL server, which handles all of the database writes. The master MySQL and slave MySQL servers are synced up, so data is up to date.
The actual photo and video files are not stored in the database, only the links to them is stored in the database (to keep the database small). The photo and video reside in a central location (like a SAN or NAS), which is accessible by all of the 3 PHP/Apache webservers.
Questions:
1. How many machines do you think will be able to handle photo and video uploads for 500,000 visitors a day?
2. Is having a SAN with Terabytes of RAIDED disk space an available option?
3. If a SAN or NAS is not an option, does anyone have any ideas on how to make sure all of the web servers have access to the same photos and videos? Is rsync a viable solution?
4. Which hosting provider do you think I should go with?
5. Is clustering what I need? What is clustering and how will it address my concerns?
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Jun 7, 2008
I'm going to be rolling out a php/mysql driven site soon and I'm pretty much resigned to the fact that the mysql performance dreamhost has given me isn't going to cut it, its probably too oversold. Simple one table one column selects can take 30 seconds or time out depending on how badly the server is being hammered. HTTP requests are usually snappy, but the mysql performance is bogus.
What is a good host for me to launch this site with? Storage wouldn't need to be too terribly high, at least initially. I'm tempted by MediaTemple's slick marketing, but I've seen on here that some people have had poor sql performance (contrary to what some personal friends have experienced, so I'm torn). I was reading about downtownhost on here, but their load times seemed slow when I hit a couple domains listed on here that are hosted by them.
This host needs to be located in the US. Honestly, I like dreamhost and their panel, save for the sql sluggishness I'm getting.
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Jan 10, 2009
im running a few blogs on a shared hosting account (steadfast) and i noticed the 18 sql queries being generated by a fresh install of wordpress 2.7 are taking 0.246 seconds to execute.
<!-- 18 queries. 0.246 seconds. -->
considering this is a shared hosting server with over 800+ more domains on it, is the performance better or worse when compared to other shared hosting providers ?
archim3des
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Aug 12, 2008
It should support jsp/jdk6.0/tomcat6.0/mysql5.0 or higher, and SSH is prefered.
Your advice will be highly appreciated.
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Mar 3, 2007
I am trying to learn more about storage solutions over Ethernet. There are iSCSI (internet SCSI) and AoE (ATA over Ethernet). Certainly the AoE is a cheaper solution. Besides pricing, what are the advantages (and disadvantages) of each?
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Aug 10, 2009
we are setting up a couple of servers for a clients application which will have 2 x 1U application servers running XenServer 5.5 and one NFS or iSCSI server (Dell 2950, Raid 10) running ether just Linux with NFS or Openfiler with iSCSI.
Would there be any benefit in running iSCSI vs. NFS considering their is no iSCSI accelerator and this is just a regular Server ?
NFS is simple but is it's performance really that much different than iSCSI in this scenario?
The network will be used by up to 12 user.
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May 23, 2008
I'm colo'ing, so this wouldn't be shared with anyone else.
I'm looking at using iscsi with Virtuozzo Containers, and while the setup for the hardware nodes seems fairly straightforward, can anyone comment on their own experiences using iscsi with VZ?
Did you find your experience reliable? Slow? Any information will be useful.
Also, did you have a hard time setting things up? Or did VZ just manage everything as if it was still on a single server?
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Jul 27, 2007
Thinking of putting together a ISCSI box with 14 sata II 750's, 3Ware sata controller (raid 6) and Intel quad port gigabit card ganged together for 4 gig transfer and tieing it all together with Open-E ISCSi or DSS module.
Anyone done something similar with good (or bad) results? Thing of using this for hosting web sites primarily as well as some storage for mail server and some databases. Servers running raid 1 and using MS iscsi initiator. Have a vlan setup just for iscsi traffic in my 48 port gigabit switch.
Are the TOE cards better to have or is the MS Initiator good enough. Plan on using the second NIC on the servers solely for ISCSI transfer.
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Mar 23, 2008
Has anyone here tried the Dell/EqualLogic PS5000 series iSCSI SANs? Any opinions on them? I'm looking to use two in a VMWare ESX cluster.
Also, does anyone have any more specific pricing than the 'starting at $19,000' that's been banded around the internet? I have an EqualLogic sales person visiting my offices in a week but would ideally like to get some rough pricing before then (eg: the price difference between SAS and SATA). Trying to get prices out of Dell hasn't been easy so far.
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Feb 6, 2008
I setup an iSCSI target and two iSCSI initiators but I am having some trouble sharing the storage.
I partitioned the drive when I used the first initiator, a 1TB partition, I mounted it without any issues, it showed up in df -h.
Now I went to mount the iSCSI target on the second initiator, I mounted it fine, the partition I made on the first initiator was recognized on this one, however when I add files to either or, the changes aren't recognized on the other initiator. Any ideas why this might be?
I put 1GB of files in one initiator and I ran the df -h command on the other, and it still had the same amount of free space.
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Feb 15, 2008
if anyone had any good recommendations for iSCSI products, either software or appliances for the small business market. We need good low cost SAN storage. I am looking at Nimbus and Open-E.
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May 18, 2008
I own a server running Helm 3 with about 300 domains.
Im looking for a backup solution to backup my whole server (MSSQL, MySQL, DNS, IIS, Registry, Mail etc...)
What's the best soltutions ? Evault or ISCSI of [url]
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Oct 5, 2008
I'm currently connecting one of my servers to an iSCSI SAN but would like to hook up another server to that target as well. However, this doesn't work with NTFS filesystem and I couldn't really find any windows solutions for that. Does anyone have experience with this?
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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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May 15, 2009
Iīm running a Dell Powerconnect 6224 with firmware 2.2.0.3 for a customer.
After upgrade to firmware 2.2.0.3 from the version 2.0.0.12, and starting to use ISCSI with link aggregation groups, the switch began to reboot every 2-3 days.
Now, i have disabled LAG and this issue also happen.
It could be a firmware problem? Really, with firmware 2.0.0.12 it was solid as rock but without a advanced usage such as vlan, link aggregation, IP routing...
Iīm not sure if my customer would like pay more and choose a more stable switch such as Cisco Catalyst...
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Mar 27, 2008
Does anyone have experience comparing the two? Any comments on why one would be better over the other?
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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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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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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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