LinuxQuestions.org
Help answer threads with 0 replies.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - General
User Name
Password
Linux - General This Linux forum is for general Linux questions and discussion.
If it is Linux Related and doesn't seem to fit in any other forum then this is the place.

Notices



Reply
 
Search this Thread
Old 05-01-2007, 07:16 PM   #1
BrianK
Senior Member
 
Registered: Mar 2002
Location: Los Angeles, CA
Distribution: Debian, Ubuntu
Posts: 1,334

Rep: Reputation: 51
Operating system on RAID - good idea or bad?


Putting the OS on a RAID 1 with the idea that if one drive dies, the other can take over without human intervention. Is this a good idea?

The reason I ask is that I just installed OpenSuse on a machine with this setup. Somehow, the RAID failed completely. Maybe a driver issue, I'm not sure. It's a brand new 3ware card. All i know is that during a 3.5TB mirror of another server, the OS portition of the RAID died & now the machine doesn't boot at all.

This leaves me wondering if the OS on a RAID is a good idea at all. What measures do people employ to ensure uptime re: OS drive, if the OS on the RAID is a bad idea?
 
Old 05-01-2007, 09:16 PM   #2
chuckbuhler
Member
 
Registered: Oct 2005
Distribution: SuSe
Posts: 95

Rep: Reputation: 17
We run the OS on raid arrays where I work. We use raid 5, and are using IBM 5i and 7i serveraid adapters. Expensive, but have paid off for us. We have been in the situation where a drive failed, and to be honest, if it wasn't for seeing the amber light on the drive, we wouldn't have noticed. We use hot-swap drives, so it's just a matter of pulling the defunct drive and replacing it.

One of the nice things about the better raid cards is that the OS is not aware of raid at all, it sees the drive array as a single huge drive (or drives, depending on how you configure it). Let the hardware do what it does best, and the OS do what it does best.

I don't know what card the 3ware is you are talking about, but you might consider looking into a higher raid level. If it doesn't support it, get a better card. It'll pay off in the long run.
 
Old 05-01-2007, 09:25 PM   #3
BrianK
Senior Member
 
Registered: Mar 2002
Location: Los Angeles, CA
Distribution: Debian, Ubuntu
Posts: 1,334

Original Poster
Rep: Reputation: 51
Quote:
Originally Posted by chuckbuhler
We run the OS on raid arrays where I work. We use raid 5, and are using IBM 5i and 7i serveraid adapters. Expensive, but have paid off for us. We have been in the situation where a drive failed, and to be honest, if it wasn't for seeing the amber light on the drive, we wouldn't have noticed. We use hot-swap drives, so it's just a matter of pulling the defunct drive and replacing it.

One of the nice things about the better raid cards is that the OS is not aware of raid at all, it sees the drive array as a single huge drive (or drives, depending on how you configure it). Let the hardware do what it does best, and the OS do what it does best.

I don't know what card the 3ware is you are talking about, but you might consider looking into a higher raid level. If it doesn't support it, get a better card. It'll pay off in the long run.
To answer your question, it's a new 3ware 9560. I don't think they get much higher end than that. It's possible there are other factors at play here - this is a rental machine... I don't know its history.

Sounds like it's not such a bad idea - just having a bad experience now & am wondering if installing an OS on a RADI is typical or not.
 
Old 05-01-2007, 09:54 PM   #4
chuckbuhler
Member
 
Registered: Oct 2005
Distribution: SuSe
Posts: 95

Rep: Reputation: 17
Just googled for that card, and looks, at least on the surface, that it's a good card. the raid level 1 is a little scary for me, but probably mostly because I use 5 or 5e almost exclusively.

With that server being a rental, I'm not sure that I'd trust it 100% either. I know this isn't helpfull, but..

My experience with what you are trying to do is with all new IBM equipment, running at raid 5, all hot-swap drives, so my point of view is a little different. I think it's a good idea, but we have a known good platform for it. That makes a very big difference.

One thing that I have learned over the years is that you have to have a balance in the hardware you are using, and the OS has to match it. A fantastic raid card and iffy drives or iffy motherboard, or iffy power supply can cause nightmares. In you situation, I'd look at the hardware closely.

It can definately be done.
 
Old 05-07-2007, 02:01 PM   #5
Shilo Carson
LQ Newbie
 
Registered: Oct 2006
Posts: 15

Rep: Reputation: 0
Quote:
Originally Posted by BrianK
Putting the OS on a RAID 1 with the idea that if one drive dies, the other can take over without human intervention. Is this a good idea?
Yes. RAID on the OS partitions is a good idea. It's standard practice.

I'm not sure why you're mirrored drive isn't booting, unless you forgot to copy the /boot partition or something like that.

Shilo
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Good idea/bad idea: interface colors introuble General 5 10-30-2006 02:33 PM
RAID newbie, 3ware 5800 a bad idea?? mentaltofu Linux - Hardware 0 06-15-2006 04:13 AM
TOMCAT: good or bad idea chadi Linux - General 3 11-02-2004 07:42 PM
Is this a good or bad idea? kemplej Linux - Software 2 10-26-2004 10:34 AM
User Private Groups - Good idea or bad? thegeekster Linux - General 0 08-12-2004 06:39 PM


All times are GMT -5. The time now is 10:10 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration