Identical Mirror/Mirroring Servers Vs. RAID5 NAS
Nov 16, 2006
We are expanding our photo sharing business and are revising our Unix-based server architecture. We're looking to develop a standard server configuration so that we can easily add servers when necessary.
Our ISP has recommended a configuration with mirrored web servers and mirrored RAID5 NAS boxes. I've read about Google's server architecture which consists of identical mirrored servers; when a drive or part from one of those servers goes down, data is served from the mirrored servers and the bad machine is repaired or replaced.
Comparing the two architectures with similar storage sizes, the overall cost of the hardware itself is about the same, with the identical mirrored machines being slightly cheaper. The monthly co-location fees (rack, power, etc.) are higher for the NAS solution.
I'm interested to hear your thoughts and experiences with similar solutions. I know the web/NAS solution is popular, and it's probably the one we'll go with, initially at least. Has anyone here implemented a Google-like identical mirrored server solution?
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Dec 18, 2005
i am new to this and am in need of some help.. i have vbulletin 3.5.0 installed with photopost gallery and phpprobid auction...
I am hosted with fasthosts on a linux dedicated server, it is crap! it has been down 3 times in 1 month, the support is terrrible.. I have already movedit from pipex hosting due to lack of support for mysql. i canot keep moving my site, my brain will melt out of my ears ...
Can i link to my original install.. so if the fasthost server goes down,, could i have it directed to the old server? and can i keep the 2 databases current?
Hope i have explained it well enough... basically need a backup server setup for my vbulletin so, i dont lose potential new members..
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Sep 12, 2007
I have two dedicated servers on two different countries. My idea is having one of them fully active and the other as a backup server so that in case the first crashes or something I only have to redirect the domains to the second server.
Can you help me on how this can be done?
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Mar 28, 2009
Does anyone run a setup where 2 or more cPanel servers (perhaps in a shared hosting environment) are dynamically mirrored for high availability?
How have you configured this? Does cPanel play nicely?
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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 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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Apr 14, 2008
2 servers in 2 different continent. One will be primary and the other is redundant. It will be controlled by DNS fail over service.
Question:
1. What is the things that i need to consider before setting it up?
2. What is the best way to sync the data and databases?
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Jan 10, 2008
I have a DB server, running mysql 64bit. I would like to add another server to the mix to build some kind of redundancy if the 1st one were to go down.
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Dec 20, 2005
There are some Download Manager Programs that have a option like Find alternate URLs through mirror list file when giving a file for downloading. Where can I insert such a file in my site so that download programs can add other mirrors to it from my list of mirrors?
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Feb 24, 2009
I was wondering if anyone knows of any provider that provides RAID VPS Mirrored Hosting.
So if one drive goes down, the site will immediately switch over to the next one in the cluster.
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Dec 17, 2008
Keeping mirrored backups...anything better than rsync?
I'm keeping mirrored backups of my servers. Does anyone know of any solution better than rsync to update the files on the backup server?
I've noticed that when running rsync it can cause a lot of disk i/o, which can slow down a running server.
Does anyone have any suggestions on how to decrease disk i/o or another solution to keeping mirrored backups on a secondary server?
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Aug 10, 2005
I currently have a mirror site set-up on a seperate server (with a seperate web hosting company) for risk management purposes.
For zero downtime dependability, a load balancer cluster checking both servers in real time, and directing traffic at only servers that were online has been suggested.
However this option is rather expensive. Does anyone know of any other options?
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May 20, 2009
I was asked earlier today by one of the tech people at the university that I go to if I knew of any hosts that would offer some space/bw/access for a website that already exists. From what I was told, the host would not be the primary server for the website, so it would not require very much bandwidth, and the entirety of the website is only 300MB, so space isn't really an issue either (As most hosts now a days offer 1GB+). The catch is that they were planning on using rsync to update the mirror host, with the latest content from the live website, every 3 hours or so. Preferably, they want to spend as little money as possible on this and not buy a dedicated server or VPS somewhere, as that would be very costly.
So, does anyone here know of a host that would offer such a thing and allow SSH access to setup the rsync?
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Mar 19, 2008
I am trying to find a piece of software that will allow me to mirror the online files of my companies domain. There are a number of contributers to the domain, so files are not stored offline in one location. I want to create an exact mirror of the contents that perhaps I schedule to mirror once every week.
I cant seem to find anything that would allow me to do this.... can anyone point me in the right direction?
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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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Apr 2, 2009
On a CentOS5 VPS I have access to "yum update" barely working due to the base mirror "styx.biochem.wfubmc.edu" being tremendously slow.
I'm trying to find out how to disable that mirror possibly via a mirror exclude setting in yum.conf or some other way. I've been searching but I've not found any documentation on this so hopefully somebody out there will know how to make this change.
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Jan 29, 2009
I'm having an issue with a client site and I am not sure what to do at this point. Conversations with the host (GoDaddy) haven't led to a solution and to be honest, I'm not sure it's their issue to handle although I will be firing off an email to their domain dispute department shortly. I spoke with a couple of supervisors there and they were as baffled as I am.
Here's the situation:
When people Google the name of the client's business, it returns their site but on a different domain. The entire site is there, nothing is changed but the URL. It's like having an unintentional mirror site except that none of the forms work which is what tipped off the users that something was wrong but of course, they don't notice that they're not actually on 'www.clientsite.com' so they think it's just a form error when in actuality, they're not even at the right domain.
There is really no way for this other domain to profit from mirroring the client's site; it's just a business profile type of thing with a few forms for contact, employment applications and vendor applications. No secure info is transmitted other than perhaps the occasional email address but we're not talking a heavy volume site, it's a niche market and really not something that would be a typical target. There's no eCommerce, no subscriptions, no financial info.
I'm at a total loss. Could this happen if this other site is hosted on the same server as my client's site? Could it be an actual error of some sort or would it have to be intentional?
The whois for this bogus site leads to DomainsbyProxy.com and I'll be sending them a letter as well but I'd really appreciate any input you all might have on HOW this could happen. Should I also contact Google?
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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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Mar 10, 2005
If you receive the following errors while trying to install a Perl Module through the WHM ...
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Nov 5, 2009
We recently began to mirror a large number of open source projects with a dedicated mirror server on our network and I was surprised not only with how popular the mirror server has become, is, but also of the ability of the hardware we're using to keep up with the load.
At an given time, the mirror seems to be pushing at least 50 Megabits of trafficthe server is also an IRC server (irc.igsobe.com) for customers and internal staff communications.
The hardware is a low end Dell Pentium 4 @ 2.66 GHZ server, running with 512MB of RAM and a 400 GB ATA hard drive. CentOS v5.3 is the operating system.
If you're interested, you can view the HTML logfile analysis here but that doesn't tell the full story as FTP users make up a good portion of the traffic. We've received over a quarter million hits in the first few days of November alone.
18:14:15 up 65 days, 9:04, 5 users, load average: 0.31, 0.69, 0.56
The only change that I made to the default configuration was lowering the maximum number of Apache servers to 128.
Just thought I'd share this information as I wouldn't have thought a server with such a small amount of RAM would be able to serve up so much data, even though we are talking strictly static HTML files.
I'll definitely keep this in mind when clients ask me for those "what type of dedicated server should I use for XXX" type discussions that are had all too often with clients.
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Jul 21, 2009
i use Adaptec 2200s with three scsi HD to do raid,
it is install centos with cpanel.
after rebooting,it can not load into the raid5 well,
and shows no logical drivers... and no operation system found.
i try to add new hd,but it still do not build and run.
i think it may the raid5 configuation on the three HDs are missing are ger problem or it will not work at all.
i want to ask,if a use another three hds with the Adaptec 2200s to set another raid5.
and build another one server.
and i mount the old first one HD from the old raid5 and mount the new first one HD from the new raid5,
and copy the files from old ones to the new ones.
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Jun 20, 2007
I run a small company and we have a web based application accessed by our customers, this application lets our customers run their business, tracking working, producing parts orders, job cards, invoicing etc.
The database we use is SQL 2005, what we are trying to achieve is have another server, either alongside the existing one, or if it would work at another location where the data from one server is written to the other server, so in the event one server went down we could quickly switch to the second server, my questions -
1, Is this possible?
2, If it is what impact does it have on the performance of server one?
3, Do both servers have to be in the same location?
4, How easy is it to configure assuming its possible.
5, Is there anything else I should be aware of?
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Nov 21, 2007
We have a webportal that has a lot of data... and we have different versions of this portal in different languages (russian, italian, chinese).
Now for better performance in china we took a web hosting there and made a copy of the portal there...
It is working as expected but it is really hard to mantain different versions of portals on different servers with separated databases and all other important scripts...
Now we are making a rewrite of our system and this rewrite will use a central database and unified data (so a user of the local (eg chinese) portal will be a user of the global portal too!
Now the portal is based on cakePHP and mySQL... so the business logic scripts and the database are only one for all the portal versions. The only thing that changes for each portal are the config files (one per portal).
Now, making it work on one server is easy but we would like to make mirror servers in russia, china and italy. Lets call them B, C and D and the main server: A.
Obviously all the servers should be in synchronisation between themselves. I've read mySQL has a replication function that would deal with the DB synch. What about other files? The portal allows users to upload their photos, avatars, attach documents and video content. We would like this files to be synchronised too...
B<=>A
C<=>A
D<=>A
and not B<=>C
or B<=>D
How do we achive this?
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Apr 3, 2006
We’ve been asked to offer a technical proposal for a new established TV station, and the IT manager of the station has a long list of requirements, we covered it all, only one issues lift as we never done it before:
They want about 20-100 GB server for hosting and they want to have a mirror server, incase the 1st server was down, so it would redirect the visitors to the mirror server, I'm thinking of getting them a dedicated or semi-dedicated server, but how do you do the mirror issue.
Some one said to get two dedicated servers, but::
1. How we make it that when one is down, it automatically directed to the other, I believe there is software’s for that, so were do we install this software: the original server or the mirror server.
2. Should they be from two different companies and to different countries?
3. The web site will be with CMS and DB, how do you make sure that the mirror server have all the new data that was updated in the 1st server’s DB, do they have like shared DB or something, and how..
Any other information, links, or suggested hosting sites for reliable dedicated server (with big bandwidth) would be greatly appreciated.. thanx
P.S. We use PHP/ MySql technology.
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Jul 30, 2009
Hello, we have a few web servers that run Windows 2003 Server and IIS for web page hosting. We develop custom applications and don't do "web hosting" per se.
What is the best way to do this in a load balanced environment? We have a Cisco load balancer out in front of these servers, but I'm curious about the following:
1) Is there a way to replicate IIS entries instead of having to configure the site on each server?
2) How does everyone handle file replication (hopefully in real time) across all servers?
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Sep 4, 2008
I have a dedicated Centos 5 server that is a live production server.
Now I need to have a server for testing things like new kernels, updated packages or changed settings to check if the web applications still run after these updates or changes before I update the live production server.
For this purpose I think the best way would be to have local virtual machines under vmware, also putting Centos 5 onto the virtual machine and even creating snapshots of it, before an update in case the update breaks too many things, I could just revert back.
My question is how can I make sure that I install the exact same packages and same versions of everything onto the development server that I have on the production server now?
How do I create an exact duplicate of my production server before I start to test updates?
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Sep 12, 2013
I moved a tomatocart website with its database, www-root. + keeping all its file and folder permissions.The username on the new server is the same, same id same name same permissions ect. The database name is the same the passwords are the same, location of www-root server same.
The website works it fetches and stores in the mysql database.At the old server with the same tomatocart website you could browse to example domain. ex/1-catagory-bananas and you would see a nice grid of bananas you can order. But there is no folder 1-catagory-bananas on the old or new server you just stay on the index.php but the url goes exampledomain.ex/1-catagory-bananas and the viewed website reloads
On the new server with the same URL i get a "NOT FOUND /1-catagory-bananas ect."so the website works perfeclty on the new server?
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Mar 1, 2007
Now I'm a little new to RAID5, I've always used RAID10 or RAID1, but I am looking into RAID5 for my new server.
Tell me which you think would be more beneficial, I know RAID10 is faster for writing and copying which is what is needed for SWAP but I also know that RAM is a lot faster than SWAP.
8GB RAM
2GB SWAP Partition
4x250GB RAID5
7GB RAM
3GB SWAP Partition
6x250GB RAID10
or
8GB RAM
2GB SWAP Partition
3x400GB RAID5
Is 3 drives or 4 drives faster in a RAID5? I know 4 drives would probably read faster but would copying and writing be slower?
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Mar 22, 2007
I am trying to configure a 2.6.18 kernel and I cannot get it to read the raid5 module since my system is utilizing a software RAID5.
Whenever I build I receive the following error:
[root@localhost linux-2.6.18.8]# make install
sh /root/kernel/linux-2.6.18.8/arch/x86_64/boot/install.sh 2.6.18 arch/x86_64/boot/bzImage System.map "/boot"
WARNING: No module raid5 found for kernel 2.6.18, continuing anyway
I have tried versions 2.6.18 and 2.6.18.8 and both give me the same issue.
I have CONFIG_MD_RAID456=m in my .config so the module should be getting configured.
I tried ignoring the warning but when I boot up my system in 2.6.18 I get a kernel panic error, could not sync. (I'm guessing because it doesn't have the RAID module). Everything works fine when I boot up in the 2.6.9 CentOS kernel.
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Jul 30, 2008
What do you feel is better for a typical shared/reseller hosting server?
RAID 1 or RAID 5 (with three drives)?
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Oct 19, 2007
How long it takes to rebuild RAID5 if one of failed disks was replaced? How long it takes to assume full performance again?
Our support changed disk in our server 2h ago, but it's still extremely slow
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