SAN - Fail Over / High Availability
Sep 24, 2009
we are currently planning to implement SAN to our enviroment - VPS hosting.
Al VPS should be placed on the SAN - iSCSI connected to be able live motion etc.
Currently we are fighting with idea of Failover/High avalability.
There has been rumors that dual controller SAN from HP/DELL are much more problematic than single controller versions.
We are also thinking about running some opensource like OpenFiler/FreeNAS/OpenSolaris or NexentaStore on supermicro boxes with SATA or single RAID controller.
But in that case - how make the iSCSI target highly available? Mirroring of the data/space is pretty easy with DRBD or ZFS but when one SAN box goes down, there should be no interruption in iSCSI targe service - no IP change etc..
View 10 Replies
ADVERTISEMENT
Mar 21, 2008
I am having a new mission to achieve and I really need some pro-Windows system to help me with their advices.
I have a server which requires high availability of data and service. Basically the server run a server/client service and all clients makes their operation over this server. The server is a simple Windows 2003 Web Edition server.
My goal is to have one server running (let’s say Tom with IP 192.168.0.1) and one running as stand-by (let’s say Jerry with IP 192.168.0.2) ready to take over if the first server crashes (this would remind pro-Linux some kind of DRBD and Heartbeat server).
So, the the first server run without problem, all transactions are going to be written in the directory “D:/Transactions”. This directory must be saved in real-time to the second server which stands in case of failure...
The first server also run a Windows service, which has to be stopped on the stand-by server and started ONLY if the first server is not working anymore.
I would like also the two servers (Tom and Jerry) to share a virtual IP address on the one which is having the service running, let’s say this IP would be 192.168.0.3.
When the first server goes offline hung or whatever, the second server take over, start the service and does the job of the first - when the first come back online, I re-sync the data from the second to the first and then, I switch it back (or all this fully automated if possible).
NOTE: the service that I need to run is special and is not one of the normal basic Microsoft service, it’s an in-house written service.
My question are :
- What software(s) do I need to do this ?
- Is there anything that I should be aware of ?
- Is there some provider (on both east and west) cost which can provide me help for the hardware part of this project ?
View 9 Replies
View Related
Jun 17, 2008
This is clearly the next logical step in hosting. Consider what RAID1 did for hard drive availability. Worried about your disk failing? No problem - throw in a duplicate. From a user/admin perspective the mirrored disks appear as one, highly reliable disk. Every modern OS supports this, even cheap motherboards support it, with a minimal amount of configuration.
The perfect high availability cluster should be completely transparent. Think about it... What if clustered hardware allowed you to manage a single instance of your chosen server OS with no worries about hardware/network/power failure?
The closest you can get to this finding a host that will give you a dual power supply server connected to different power feeds, dual network cards connected to different switches, and hot-swappable mirrored hard drives. This solution still doesn't give you any protection from CPU, memory, or motherboard failure.
I want a solution that is as simple to configure and manage as simple RAID1 mirroring.
View 14 Replies
View Related
Jan 16, 2008
I'm trying to determine what type of hosting setup (and hardware) I'd need for a web-site that expects 50,000 page views daily with peaks around 500,000.
the idea is to have it stable and serving content (almost all of which will be static).
Are there any hosting organizations or hardware configs that people would recommend?
View 4 Replies
View Related
Jan 5, 2007
We are trying to develop a design for a cluster of web servers at a single data center which will ensure that the cluster, as a whole, has very, very high availability.
Each of the servers is basically identical. They all serve web pages, and each can act relatively independently of the other.
Our initial thought was to put the servers behind a redundant, hardware-based, load balancing solution. The load balancers would be able to detect if any single webserver went down, and would redirect traffic to the other servers in that case.
An alternative -- less expensive -- solution that has been suggested to us is to use EtherChannel. We're concerned, however, that it might not be as robust an approach as the load balancer solution.
how we can best assure the high availability of our cluster?
Cost is an important consideration for us.
In addition, we'd prefer a solution that allowed for session maintenance. That is, once a user starts interacting with a particular server in our cluster, it would be nice if they could continue interacting with that particular physical server.
As an aside, I'll mention that we intend to implement this approach at two different data centers in different geographic regions, and use round robin DNS to further ensure high availability of the overall set of servers.
View 10 Replies
View Related
Aug 10, 2007
I already have a VPS with Knownhost but since i'm hosting a critical application i really need High Availability.
Could anyone recommend a company that can provide me this?
I rent a VPS with them + pay additional tax and they conf a VPS Cluster.
The application is PHP + Mysql based. Everything is stored on MySQL and the PHP is only changed when there is a upgrade. Also, PHP is compiled with Ioncube ( doesn't know if this matters ).
View 10 Replies
View Related
Jun 28, 2008
We have created an ASP.NET (so solution needs to be windows) web service which other website will access to draw data.
I have been testing GoGrid, whilst the concept is great the uptime is not quite there at the moment, but its only Beta so this is to be expected.
I ideally want a load balanced system, but one that can detect failure and stop directing traffic to the failed server.
Can anyone recommend a company with an option for load balancing with failure detection?
View 6 Replies
View Related
Aug 1, 2008
has anyone had experience in building high availability systems?
View 0 Replies
View Related
Jun 11, 2009
am having 1.8 load average on a new dedicated Core2Quad q8200 2.33GHz server with only 4 accounts on it i think that's weird, the most busy process using more than 98% of the cpu is:
/usr/local/cpanel/3rdparty/bin/php-cgi -c /usr/local/cpanel/3rdparty/etc/roundcube /usr/local/cpanel/base/3rdparty/roundcube/index.php
top command shows the most busy process is:
5418 cpanelro 25 0 21460 11m 4116 R 99.0 0.6 527:01.65 php-cgi
View 8 Replies
View Related
Jan 11, 2007
Is anyone aware of the current availability of colocation space at Equinix in Ashburn, VA? We are currently trying to obtain some space with them but getting my dedicated sales contact to respond is like pulling teeth! Are they so full (and thus full of themselves) that we will have to operate on THEIR terms (if at all)? At this point we are soliciting quotes from other datacenters of known lesser quality just so we can get this deployment live...
View 14 Replies
View Related
Apr 18, 2008
where I can now ip is availble or not? and how i buy it?
View 10 Replies
View Related
Nov 3, 2009
Has anyone been able to find any compatible RAM in 2G DIMMs for the SuperMicro X8SIL motherboard running either Corei7 or X34** LGA1156 processors? And what about reasonably priced 4G modules? I just want to make sure to purchase the right RAM before moving to a setup with this board / processor. Unless the RAM for this is crazy priced, I really don't want to go the Core2 Quad route when for about the same I can go with the newer LGA1156 stuff. But I have seen where people are having issues with RAM compatability and availability.
View 5 Replies
View Related
Jan 6, 2009
any recommendations for a website availability monitoring service? That is, I'd like a service that checks my site regularly, say every 5 minutes, and then calls my cellphone /txts-me if it ever goes down.
Googling around turns up a sizable number of places that do this. But, I'd like to make I'm going with somebody who's reasonably good.
View 14 Replies
View Related
Feb 20, 2008
I have a cPanel server with 4GB RAM
My server hangs time to time, once or twice a day. This is the last status when it happens.
Server Load 75.90 (2 cpus)
Memory Used 92 %
Swap Used 65.78 %
When I was still inside SSH when it happens, the processes I can see inside "top" are a lot of httpd processes.
So I "killall -9 httpd", I had to do it 30~40 times
#killall -9 httpd
#killall -9 httpd
#killall -9 httpd
x 30~40 times until no pid process found & the server load is back to normal.
Before that, I check httpd fullstatus, they look very normal, same goes to what I see inside WHM Apache status & cpu usage status.
At first I thought it was a memory problem after consulting with a server admin, so I replaced all 4GB new ram stick (such a waste)
View 12 Replies
View Related
Nov 14, 2014
This is my free -m
total used free shared buffers cached
Mem: 1998 1903 95 0 45 542
-/+ buffers/cache: 1315 683
Swap: 2662 36 2625
Not good ....
I got 5 wordpress and 5 statics website on this server and 100 visitors by 24H00 each day.
Question 1 : Why the memory is so low and the swap so high ?
Question 2 : Why i don't find high usage process in top command ?
Question 3 How can i resolve this problem ?
View 2 Replies
View Related
Oct 31, 2009
My server is very slow, High CPU, High Apache load....
I got a new server and i had setup a script on it.
No server tweaks has been done.
I run a filehosting site so it gets very slow when traffic is high.
Here is some info:
Code:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4135 filedip 19 0 12812 8892 2212 R 18.9 0.4 0:00.74 index.cgi
3140 apache 15 0 22624 9604 2768 S 17.3 0.5 1:54.45 httpd
3556 apache 15 0 22792 9592 2768 S 17.3 0.5 0:43.53 httpd
3739 apache 15 0 22672 9556 2744 S 17.3 0.5 1:09.67 httpd
3884 apache 15 0 22664 9560 2744 S 17.3 0.5 0:23.98 httpd
3474 apache 15 0 22672 9572 2756 R 16.1 0.5 1:34.09 httpd
3548 apache 15 0 22792 9560 2740 S 16.1 0.5 1:33.67 httpd
3991 apache 15 0 22640 9588 2756 S 15.1 0.5 0:22.44 httpd
3475 apache 15 0 22672 9580 2756 S 13.2 0.5 1:31.42 httpd
3493 apache 15 0 22664 9592 2768 S 12.9 0.5 1:15.52 httpd
3769 apache 15 0 22664 9580 2756 S 12.9 0.5 0:45.19 httpd
3638 apache 15 0 22664 9576 2756 S 12.3 0.5 0:32.82 httpd
3724 apache 16 0 22664 9580 2756 R 12.3 0.5 0:34.25 httpd
3626 apache 15 0 22672 9580 2756 S 11.7 0.5 0:52.54 httpd
4023 apache 16 0 22792 9560 2740 R 11.3 0.5 0:13.16 httpd
3882 apache 15 0 22664 9576 2756 S 10.1 0.5 0:38.56 httpd
3005 apache 15 0 22672 9588 2768 R 9.1 0.5 2:06.61 httpd
I dont know much about server managment...
how to fix this so server doesnt go slow?
View 6 Replies
View Related
Jul 2, 2009
I have a site that is eating up my server resources and need to know what the best solution for this is. I'm thinking of getting another server just for mysql but do not know what specs the server should be to handle the current traffic/database load and have the site run smoothly without slowing down to a snail's pace.
An alternative is to get another server just for the videos being served and leave the database and html on the current server. This is where I'm stuck and don't know what route to take with this.
My current server stats:
Dual Xeon 5130
4GB RAM
250GB
50 Mbit/sec
CentOS 3.9
Website traffic stats:
15,000 visitors/day
150,000 pageviews/day
Serving videos
I've attached screenshots of top and bandwidth usage per day. Hopefully with this information you could tell me if I need another server or if there are any things I can do to the current server to help things move faster.
View 13 Replies
View Related
Jun 13, 2008
My messages log is full of such type of messages:
... smartd[2493]: Device: /dev/sda, 5 Currently unreadable (pending) sectors
... smartd[2493]: Device: /dev/sda, 5 Offline uncorrectable sectors
... smartd[2493]: Device: /dev/sda, 5 Currently unreadable (pending) sectors
... smartd[2493]: Device: /dev/sda, 5 Offline uncorrectable sectors
I run: smartctl --all -d ata /dev/sda2
and got this table:
Code:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 118 093 006 Pre-fail Always - 195271338
3 Spin_Up_Time 0x0003 094 094 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 48
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 0
7 Seek_Error_Rate 0x000f 084 060 030 Pre-fail Always - 259244139
9 Power_On_Hours 0x0032 090 090 000 Old_age Always - 9516
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 51
187 Unknown_Attribute 0x0032 087 087 000 Old_age Always - 13
189 Unknown_Attribute 0x003a 100 100 000 Old_age Always - 0
190 Unknown_Attribute 0x0022 056 044 045 Old_age Always In_the_past 740163628
194 Temperature_Celsius 0x0022 044 056 000 Old_age Always - 44 (Lifetime Min/Max 0/14)
195 Hardware_ECC_Recovered 0x001a 067 049 000 Old_age Always - 145805438
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 5
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 5
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0000 100 253 000 Old_age Offline - 0
202 TA_Increase_Count 0x0032 100 253 000 Old_age Always - 0
Machine freezes several times a day.
I have this machine with FDCservers. They kindly replaced power supply but I'm worrying that it's not caused by power supply but HDD.
take a look at table and let me know your opinion.. Is this HDD ok or will it fail soon ?
View 3 Replies
View Related
Oct 22, 2007
way to get a complete DNS Fail-Over solution for my website.
Currently I'm hosted at one Hosting Facility in NY, and I'm thinking on getting a backup location either in TX or CA but my biggest problem is visitors as even If I will get the secondary location and set the TTL to 10-20min some ISPs are caching the ip address for 24hrs, so even If I will change the IPs from the old range to the new, some ISP's around the world will still cache the old IP and the visitors will get nowhere in case the main location has an issue.
And I was wondering if there’s a way to send people to one direct IP let’s say 1.2.3.4 and from there to load the pages / db or mask there connection under the domain name to a different location without them noticing it so the SSL certificate wont produce error messages.
As I'm sure that Yahoo, CNN and other major websites don’t use one web server for accept connections all over the world to their websites.
View 7 Replies
View Related
Nov 19, 2007
My server getting huge number of anonymous user.
Even I had disabled anonymous login at the WHM.
When the max user reach it will make the ftp fail and restart.
It usually reach max user within a 5 to 10 minute.
How to block this?
View 10 Replies
View Related
Oct 7, 2006
what happens when I have 2 DNS servers on my domain and 1 fails?
around 50% of the access fails... or they detect DNS timeout and try the other one, so 50% of the access would just take more time?
View 2 Replies
View Related
Apr 12, 2009
cpanel tech staff say my server
---------------
in a broken state halfway upgraded from centos 4 to centos 5. You'll need to either complete the update to centos 5 or revert to centos 4. Easyapache and some other cPanel functions require that yum be working, but "yum update" on your server currently fails due to the mix of centos 4 and 5 rpm's you have installed
---------------
i want to ask how can i fix the issue?
because i run "yum update",it fail.
View 4 Replies
View Related
Jan 27, 2008
i try to install packages using yum, but at the end yum always say nothing to do
Reading repository metadata in from local files
Parsing package install arguments
Nothing to do
OS centos 5
View 5 Replies
View Related
Aug 29, 2008
So speakeasy decided to jump on the dedicated server business, and I tried them. My recommendation: Do not sign up for a dedicated server with them - that is unless you want to wait more than a month on your server (took them 35 days) in which they will lie to you and make up excuses for why they take so long. Then once they set up your server, expect it to get piss poor bandwidth and not function properly. The customer service takes 72+ hours to respond 10% of the time. The other 90% they don't respond at all. My sales rep apologized more than 15 times to me in the 35 day period I waited on my server claiming they are "new to the managed services business." This was more than obvious - I basically handed them $600 and got a worthless piece of junk which sat idle for 30 days in return.
View 3 Replies
View Related
Dec 26, 2007
I have APF and Brute Force install on the server how can i set so if the same IP try to login ssh 5 consecutive time and it fail it will be ban.
View 4 Replies
View Related
Oct 8, 2009
I am only writing this post here because I used webhosting talk to research my recent purchase of a dedicated server with liquidweb.
I have been a happy liquidweb VPS customer for the last year and have grown my business with them. Last week I decided to upgrade from a VPS to a dedicated server and that is where things went wrong.
Stefan in sales was nice in taking my order and had my new server setup in very little time. I got an email that everything had been migrated and they would do the cut over Friday morning.
Friday morning I awoke to phone calls from my clients saying they were not getting emails, their site was down, etc.
I do some initial research and find out that liquidweb sold me a new dedicated server with old used dirty ip addressees that were blocked by ATT / sbcglobal / pacbell. To compound this problem a week later and three ip changes all of which were blocked I am still being blocked and on their blacklist. See below for list of other problems.
I was transferred to Bret my account manager who has done nothing for me and hung up on me through web today while pleading with him to get someone to help me.
I can only talk to a support supervisor and no one will let me talk to a real manager. I went on vacation to Boston this week and have been dealing with these issues the entire time.
I feel like I have been pawned off and shuffled around from person to person and can not get my issues resolved.
And to throw salt on the wound they billed $209 for a $159 server and then charged me a seperate $10 for 2 days from last month. Stefan assured me this transfer would be done at the end of the month so there would be no additional charges. Another lie.
Below is the short list of all the issues I have had with liquid web over that last since my migration.
Mysql databases were copied over
Email forwarders were not copied over
Email was being blocked by ATT/SBC/Pacbell
SPF records were not copied over
A records were not copied over
They sold me a new server with old drity blacklisted ip addresses.
After three sets of ip addresses I am still being blocked.
I was billed for both my old VPS and my new server when stefan the sales agent told me it would be a seamless migration and I would be billed for the server starting next month.
Can never talk to the same person twice. Have talked to about 20 people total over the talk week no one will take responsibility to get my issues resolved.
Can anyone recommend a fully managed dedicated server that will handle my migration with care and take responsibility when issues arise.
View 14 Replies
View Related
Apr 5, 2008
I know I have seen a command line you can use which will activate :fail: in all the accounts on the server simultaneously so that you don't have to do each account separately, but I can't find that command.
Does anyone here know what that command is? I'm assuming it would involve /etc/valiases/?
View 4 Replies
View Related
Feb 23, 2008
I have OS fail , now im install new OS on new HDD, how can i mount and get data from fail hdd ?
Here is info:
[root@server-210-245-124-170 ~]# fdisk -l
Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 1971 15727635 83 Linux
/dev/sda3 1972 3929 15727635 83 Linux
/dev/sda4 3930 30401 212636340 5 Extended
/dev/sda5 3930 9151 41945683+ 83 Linux
/dev/sda6 9152 13067 31455238+ 83 Linux
/dev/sda7 13068 14111 8385898+ 82 Linux swap / Solaris
/dev/sda8 14112 14372 2096451 83 Linux
/dev/sda9 14373 30401 128752911 83 Linux
Disk /dev/sdb: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 30401 244196001 8e Linux LVM
Disk /dev/sdc: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 * 1 13 104391 83 Linux
/dev/sdc2 14 30401 244091610 8e Linux LVM
[root@server-210-245-124-170 ~]#
/dev/sdc is old HDD with OS failed. I wanna mount is and all data to /oldroot folder for copy and restore data.
View 10 Replies
View Related
Oct 6, 2007
I wanted to upgrade proftpd and dit this.
I followed an how-to on directadminforums:
Code:
cd /usr/local/directadmin/customapache/
wget ftp://ftp.proftpd.org/distrib/source....3.1rc2.tar.gz
tar xzf proftpd-1.3.1rc2.tar.gz
rm -rf proftpd-1.3.1rc2.tar.gz
cd proftpd-1.3.1rc2
./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var/run --with-modules=mod_ratio:mod_readme:mod_tls
make
make install
perl -pi -e "s/^AuthPAM on/#AuthPAM on/g" /etc/proftpd.conf
/etc/rc.d/init.d/proftpd restart
I changed the proftpd-1.3.1rc2 version to the newest version of proftpd.org
When I run /etc/init.d/proftpd start, I get the following:
Code:
Starting proftpd: - mod_tls/2.1.2: compiled using OpenSSL version 'OpenSSL 0.9.7k 05 Sep 2006' headers, but linked to OpenSSL version 'OpenSSL 0.9.7a Feb 19 2003' library
- Fatal: unable to load module 'mod_tls.c': Operation not permitted
[FAILED]
View 4 Replies
View Related
Aug 4, 2007
I'm using this script (I think I got it off of WHT) to restart httpd whenever a file failed to download on my server.
Code:
#!/bin/bash
FILE=[url]
rm -f test.file
wget -q $FILE -O test.file
if [ ! -f test.file ]
then
/etc/init.d/httpd restart
echo 'ALERT - HTTPD restarted on:' `date` | mail -s "Alert: HTTPD Restarted" user@domain.tld
fi
exit $?
I have it on crontab
Code:
*/5 * * * * /bin/nfup > /dev/null 2>&1
but it didn't seem to restart httpd, I got no e-mail and our site was down for several hours.
Is there anything wrong with the script?
View 10 Replies
View Related
Mar 16, 2007
I have this server with no control panel and dnsreport could not connect to mailservers on all my domains. But the server can send out emails because I'm receiving logwatch emails, etc. I'm also using dnsmadeeasy for my nameservers.
Quote:
ERROR: I could not complete a connection to any of your mailservers!
mail.mydomain.com: Timed out [Last data sent: [Did not connect]]
If this is a timeout problem, note that the DNS report only waits about 40 seconds for responses, so your mail *may* work fine in this case but you will need to use testing tools specifically designed for such situations to be certain.
I tried adding the domains on /etc/mail/local-host-names and restart sendmail but the error is still there.
View 0 Replies
View Related
