Mirroring/Imaging Drive From One Server To A New One?
Jun 22, 2009
I currently have a dedicated server with a single hard drive in it with about 800 cPanel accounts. I am purchasing a new server with identical specs but will have 2 hard drives in RAID1 from the same data center.
Is it possible to make an exact image of the first server to avoid any configuration loss on the new server? I have already spoke to the data center about moving the current IPs to the new server and I know moving the cPanel accounts can be done in WHM but I would like to preserve all of the server settings, configurations, and background scripts that I have running.
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Mar 22, 2008
I would like to create an exact copy of my live drive on a daily basis via cron. Is there a good mechanism for doing this *without* taking the main drive offline? It seems like the two common backup solutions: dd and rsync both have issues in this area. I don’t think Rsync can create an exact mirror (including partitions) and dd looks like you need to unmount the drive(s) first.
Both drives are of identical size and installed via the ide controller.
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Jun 11, 2008
We are setting up 5 instances of Windows 2003 server on all the same server hardware. I want to spend the time setting up 1 instance, so installing windows updates, drivers, settings, configuration, then have the ability to mirror/image that perfect setup 4 other times.
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Jun 22, 2008
I've decided I want cPanel installed on my iWeb dedicated box. They informed me it will require a reinstall. Before they do this I wanted to image the disk and download the image to my PC. Is this possible to do via SSH? I'd prefer an open-source free solution.
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Mar 22, 2007
We are considering buying rackspace at a datacenter, and setting up two servers. The first would be the primary, lets call it Stewie. The second is called Peter.
Is it possible to setup some sort of either software or hardware solution that automatically mirrors all data from Stewie to Peter automatically?
Basically we want a redundant setup, where if either one of the server fails, the other can take over without any interruption and loss of data.
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Apr 9, 2008
I was wondering how I can mirror another server, I have a client website and they want redundant DNS so if one of their servers goes offline, the other will keep it up. Any ideas how I can set this up? Is it difficult to do?
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Jan 30, 2007
First of all appologies if this is posted in the wrong forum, was unsure of where to ask the following questions.
We have a web server running a web application accessed by a large number of users during a working day. On an evening the web server is set to back up the database to another web server at a different location.
The server is running SQL 2000 ( although we are just upgrading to SQL 2005)
My question is how easy would it be to setup our server so it "mirrors" to our back up server. What I mean by this is that at periods during a working day the database is transfered to our back up server at periodic intervals, say every 15 mins, so that in event we suffer a problem with our main server could re direct our users to our back up server, with little or no data loss?
If this is possible does it also put extra strain on our server that is being accessed, i.e. would users notice a slow down of server as data is moved about?
If all the above is possible, is there any easy way of pointing our domain name at the back up server within say 15mins or so of main server failure? if our main server went down we could not redirect users form main server to back up, so is there any method of making this happen in event of failure of main server?
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Sep 4, 2006
I'm a web designer - not an IT guy, as such I'm not 100% on setting up servers/dev environments etc...
I'm freelance and currently working in-house for a client that has set up a dev server that supposedly mirrors their live site - its a catalogue site with loads of dynamic elements.
The dev site they've set up displays only the html, no images or stylesheets link up when i preview them in dreamweaver as they don't logically link to the page as the pages are templates drawn from various folders.
What I want to know is is it possible to mirror a dev server exactly like the live website so the scripts etc all work as they do on the live site. I'm pretty sure it is as I've worked on dev servers before but not one like this bloody mess. The IT bods here seem to think the dev server is the best that is achievable - are they right? am I missing something???
I can't really answer any technical questions apart from i think the dev server is an apache server - what do i need to explain to the IT bods to get my point across?
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May 21, 2008
Well I am looking to learn to manage a server (so I won't need to hire others to do what I can do). However I have some basic questions.
1) So lets say you have a server with two identical HDD's and raid 1?? or a SATA controller so that the second HDD is just a mirror of the first HDD when/if the first HDD dies does the SATA controller or RAID card see that the first HDD died and switch to the second HDD so the site that is hosted on the server stays online?? I am thinking yes as that would seem to be the point of having a raid or sata controller and setup ??
Part twoto the question is is their software that you need to install that will make the server email you when/if a HDD dies (so you can do pull the dead one out and replace it with a new one). Or is it just that you would watch some type of server log(s) to stay ontop of if the server is running all good??
Second is how common (these days) is it for a server that would be new and brand name have a HDD die or have some other hardware failure?
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Jan 29, 2009
A great insight to alot of my research and thank you in advance for any advice given.
I have a server based in HK(with WHMCS) and host several websites. The speed and availability serves the Asia Pacific market/viewers well; but we have several new websites that also targets the European and North American viewers.
I have been researching on getting a dedicated server based in US to mirror our server. Therefore allowing the US/European market to access the website faster. Although we have a few problems (and very little budget to solve it too ;p)
1. We need to sync the two servers in real time ; rsync seems to be the best but is there any other reccomendations?
2. We will make the IP address in each servers the same, so our clients need not change their dns. Do we need IPcast/anycast?
3. Is there anything else that I may have oversight?
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Oct 17, 2006
This is my first post and had a question about dns and mirroring.
Here is the scenerio :
I have my main website on server1 and it is a whm cpanel server. The website is dynamic and database oriented website.
I have another server - server2 with whm installed on it and I wish to configure both the servers such a way that the data is synchronised on both the servers in particular intervals.
Also I would like to configure dns redundancy in such a way that if one server goes offline for some reason, the website should be immediately resolving from the other server.
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Oct 29, 2007
My company requires a Mirrored Server setup. I hope someone can direct me to the right solution which guarantees the least downtime.
- We have 20+ php/mysql websites.
- We need two dedicated servers hosted in 2 different datacentres.
- Users are directed to the first server.
- If the first server is down the users are automatically directed to the 2nd server @ the 2nd datacentre.
- The software/hardware which redirects the users need to be fail proof or have an instant backup which takes over incase that goes down too.
- Data (databases and files) needs to be synced correctly to avoid data not being mirrored correctly.
I've done some reading and there is alot of mention of the DNS round and load balancers.
However, it seems these two options are also not fail proof.
Would appreciate if someone could simply outlining what system would be best for us for 100% uptime incase of server failure.
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Nov 4, 2009
If anyone can help me in doing this, I'd appreciate it. I searched to see if anyone had already done this, but I didn't find anything so my apologies if this has been answered before.
Here's what I have: 1 dedicated server with a static ip of course and currently, I run all my sites off of this machine as well as my few clients. The server is running CentOS and Apache.
What I want to do is build a new server at my house/office and create a secondary webserver that mirrors my current setup. I've heard about using Rsync to do this, but I want to know if it'll allow for the balancing effect I'm looking for.
Rather than use this 2nd server as a backup only, I want also use it for dns resolution. Right now, all my sites are using two nameservers (NS1.2D.NET and NS2.2D.NET), but they both point to the same IP address at the same location. I want NS2.2D.NET to point to this 2nd server for redundancy (in case the other location goes down) and also for balancing (to spread traffic over two servers instead of just one).
Eventually what I'm going to do is move all my clients and websites to one location again, but my own location so I can save the expenses of dedicated hosting off-site. However, I want to use this setup as a test to see if my own location will be able to handle the traffic and such.
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Jul 7, 2009
I have a LAMP server running and would like to have the exact mirror running on another location. I would like to sync the web files and database in either real time (upon any update) or in delayed mode (x minutes after the update).
For MySQL, I believe replication can do the job unless anybody has better recommendation. What would you guys suggest for web files? Can I use different Linux flavor but maintain back the same LAMP version?
Is there any "online" 3rd party load balancing service that I could use to load balance the traffic to both servers?
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Jan 8, 2007
We damaged a file on a windows server 2003 system which caused us to get a grey screen where the login windows should be (it was setup as a domain controller)
We tried booting it in safe mode and all the other modes etc etc.... but to no avail... we couldn't get it to work.
So we wanted to replace the file manually using another pc (by inserting one of the harddrives into the pc, and copying the file to it).
We used a windows XP machine.... imported the harddrive using disk management..... we had to un mirror the drive to be able to access it.
Once the mirror was broken i gave it a drive letter, copied the the new file to it, and, removed the drive letter i assigned it, and tried booting with *just* that drive in the windows 2003 server.
Now it wont boot, it just reboots everytime i tries to start up, probably because we broke the mirror on a different machine.
It still boots from the other untouched drive... that was in the mirror, but we have no way to edit the files on there.
So is there any way to actually get this, once mirrored drive, to boot now its a single disc?
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Jan 26, 2007
1- i did Os Reload with new Hard drive for "home"
2- data "backups" drive lost
3- replaced the old home drive as "/old drive"
4- " /old drive " is now the secondry drive in my server and it has the all sites usres and evry thing
5- what i need , to trasfer, copy this sites from " /old drive " to "home"
but data center said
The /olddrive/home directory contains the contents that were previously in the /home directory. You can copy files from this directory to any other directory on your server.
The command to copy files in the UNIX environment is the "cp" command.
The user directories in /olddrive/home directory contain the web page files for the users. However, simply copying the contents over will not recreate the users or domain entries in DNS/httpd. If you wish these back you will need to recreate them manually or restore them from backups.
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Feb 16, 2007
Primary drive (centos/cpanel) is corrupt
The server is displaying these errors when I tried to do an FSCK:
Bad inode IO
ext3-fs error (device(8,3)) IO Failure
I am having a new primary installed and old primary set as 2nd drive. I need to recover the cpanel domain accounts from this 2nd drive after I mount it with the method below:
mkdir /backup
mount /dev/sdb1 /backup
However, how do I actually recover these accounts in an automated process via whm? I've done this before with the same matter (corrupt primary drive, mount as 2nd, etc) but cannot exactly remember the proper steps.
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Dec 28, 2007
I just purchased a brand new 10K 150GB drive. How can I take an exact copy of my current drive and transfer everything over to the new drive? I think I need to create a snapshop, or mirror it somehow.
What software will do this? I was told trueimage, but its very pricy, is there anything else?
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Jul 9, 2007
I have a dedicated box and I started getting Input/output errors today.
I tried:
# fsck
fsck 1.40-WIP (14-Nov-2006)
e2fsck 1.40-WIP (14-Nov-2006)
/dev/hda2: recovering journal
fsck.ext3: unable to set superblock flags on /dev/hda2
then I tried:
# fsck -a -t ext3 /dev/hda2
fsck 1.40-WIP (14-Nov-2006)
/dev/hda2: recovering journal
fsck.ext3: unable to set superblock flags on /dev/hda2
My data is backed up, so was going to ask for a reimage, but is this an indication of bad hardware? Should I ask for a replacement drive? Is there anything else I should try on my own before going to the host?
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Mar 21, 2007
I am in the process of moving my dedicated server from one location to another. I have requested second drive to be installed on server. How do I access in through SSH? I am using Linux, FC4.
Also, what is the command to compress all data in certain directory, so that I can simply wget the large compressed file from the new server?
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Oct 21, 2009
I just got this email today, don't know how to remove unused space in that drive or what to do exacly, please help in advice.
Code:
Drive Warning: /dev/sda2 (/usr) is 81% full
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May 3, 2008
After adding a second drive mounted as /home2 for backups I attempted to use the cPanel "Configure Backup" and I get the following message.
Quotas cannot be built!
Your cpbackup destination is on a filesystem which has quotas enabled.
Please move it to a filesystem which does not have quotas turned on
or a separate partition/disk slice mounted at /backup.Backup has been
disabled to prevent quota problems...
All searches on how to resolve this really reveal no solutions.
I did a google search on "disable filesystem quota" among others and could
find nothing.
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Apr 21, 2008
We have a powerful server for our databases, 8 cores, 4gb ram etc because we have a huge amount of MySQL data. We store the data on a standard SATAII 500GB drive, would we notice a dramatic performance improvement if we stored the data on a SA-SCSI 10/15k drive?
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Feb 28, 2008
it looks like dell sell sas mainly without scsi now, with high load server,scsi and sas will better than sata, but the price of sas is higher a lot, i want to ask if you use sas hdd to run your hosting server? and if it is worth to use sas now?
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Apr 20, 2007
What is the best way to setup my server hard drives for shared hosting? I have yet to purchase the hard drives. I was thinking of using two 250GB HD's or maybe a single 500GB HD. What is your experience with this in the past? Should I aim to use SATA or IDE? My thoughts are its better to have two drives for redundancy and performance.
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Apr 9, 2007
any idea if this is possible? basically what i'd like to do is make a "virtual folder" in my linux box that is actually a connection to an ftp account on another server.
so for e.g. if i say cd /myftp it'll show the contents of that directory as though it was a standard folder, however it is actually connecting to some other machine via ftp?
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May 22, 2007
I know this isn't really hosting related, but WHT has always given the best answers to questions.
Right here goes...
I have a new 1U server, which I ordered with no CD drive, as I have a little USB external DVD/CD which I would normally load the OS on.
However I have LOST IT !!!!
So I have been crawling the net for ways to install Windows XP (im just using XP for a very short time for testing!) from either a USB stick or by taking the hard drive out of the server, and copying the CD content onto it from a working windows computer.
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Sep 13, 2007
I look after a Dell PE2800 server, it has a pair of 5.25 bays on the front, the top most of the two contains a Dell PowerVault 100T DAT72 tape backup drive. I have a second identical drive that i now wish to install into the bay beneath in a similar manner.
Problem is this - my colleague tell me that Dell are no longer selling the mounting brackets / rails needed to install the drive. I have had a fruitless look through the internet for a number of weeks now and hope that someone in the forum may be able to suggest a solution to the problem... anybody know a source for the brackets? Is there a parts site somewhere ive missed? Anyone happen to have what im after? Or any alternative suggestions?
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Feb 8, 2008
I'm about to purchase a 2nd server to be used as a database/app server alongside my current server (of which will be the web server).
I wish to use 2 x 146GB 10K SCSI hard disks (in RAID 1) on the database server, but will be keeping 2 x 320GB SATAII 16M in RAID 1 on the web server. Will the SATA hard disks affect the performance / effectiveness of the SCSI disks or will I benefit from SCSI even though they're only in the database server?
Also, I'm going for 10K hard disks over 15K because they $20 per month cheaper and it's already expensive ($150 p/m for the two 10K or $170 p/m for 2 x 15k). Taking into account the already hefty price, is it worth the extra for 15K?
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Mar 4, 2007
I get the following message in my email:
"S.M.A.R.T Errors on /dev/hda
From Command: /usr/sbin/smartctl -q errorsonly -H -l
selftest -l error /dev/hda
ATA Error Count: 1
Error 1 occurred at disk power-on lifetime: 7712 hours (321 days + 8
hours)
----END /dev/hda--"
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May 30, 2008
As I have never used cPanel neither have whatsoever experience with control panels, in the process of ordering a couple of new server I am wondering what's the average recovery time after a server failure which involves data (ie. disk failure).
I am interested to understand this, because I need to choose between hardware raid or backup disk.
For example, at LiquidWeb (this is just one of the many managed providers i am evaluating) you can pay the same server 264$ with 2x250 hardware raid 1, and 219$ with 2x250 simple hard drives, where the second one is supposed to be a backup drive.
I am yet to ask, but on this servers most likely (at this prices) they do not have hot swappable disk drives where they can rebuild the array "live", so also if i choose raid hardware, in case of a disk failure, i face a downtime to bring down the server, rebuild the array, bring on the server, which I guess is something not less than 30-60 minutes downtime.
The advantage of this solution is that a disk failure keeps the system running, so you can schedule a maintenance window to replace the disk and rebuild the array, I guess.
On the other side, relying on a backup disk (and of course rsyncing data to an offsite server, i would do this anyway) you save 45$ each month, and disks after all do not fail every month.
If the main disk fails, they need to replace the disk, install again the server with what I suppose being a standard image (so let's figure a couple of hours, as they have a 30min hardware replacement sla), then you need to restore backups (which in my case are something like 20gigs). So I guess, on an average, it would take something like 4 hours downtime.
Am I correct ?
What would you reccomend as a solution with cpanel, taking into account the huge price difference ? Backup drive or Hardware raid ?
This would be for a single big website, not a hosting-company with resellers and customers environment, so I would value more the monthly saving, rather than the high availability, but of course I am interested to know what is the average time to recover a cpanel server after a drive failure.
Besides I have also another question, as I have never had a colocated server with raid hardware, so i do not know anything about this.
When a drive fails in a raid1 hardware environment, how the hosting provider gets notified ? I suppose it's not a led on the server to blink, as no one would see it.
So if you have software raid (like my computer at home) you get an email from mdadm with "warning, array degraded", so you know it quick and you can check it anytime doing a ' cat /proc/mdstat '. What about hardware raid?
My fear is that nobody notices my raid1 drive failure, the server keeps going on just a drive, then maybe the other drive fails, and it would be unpleasant: while a single drive failure would be obviously very easy to spot for me.
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