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Old 04-03-2015, 05:48 AM   #1
madhan.dctrvs
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which is best root disk mirroring or Hardware Raid when using Enterprise Linux?


I want to build some servers with HP Proliant Gen 8 servers with RHEL 6.0 Box.Which method of build is best means Hardware raid or root disk morroring.Please advice to build effectively.Thanks in advance.

Last edited by madhan.dctrvs; 04-03-2015 at 05:50 AM.
 
Old 04-03-2015, 06:22 AM   #2
wpeckham
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That depends

Oh man, what a question.

Well, that depends upon your storage devices and usage case. There is no simple "this is best" answer.

For Data server use, go 6 ssd drives with raid-10 as the most performance storage option. It pairs well with RHEL-6, but use the trim setting for your EXT4 mount. XFS is a solid option also, but I have not tested it myself. BTRFS knows SSD better, but is not really ready for prime time in RHEL-6. IT plays bit better in RHEL-7 and I expect good things from it later.

If you have rotational drives (standard hard drives NOT ssd) I would go for 6 or more in RAID-6 configuration running EXT4 or XFS for the best performance.

If this is NOT a Data server, then that level of storage performance is likely to be major overkill and unjustified expense. I would take three or four drives in raid-5 over a mirror. It still gives you the single drive failure recovery without making you jump through hoops to ensure failover works properly.

I have not tested BTRFS for this purpose, but I understand you can mirror the boot volume ext4 and join all other partitions and devices to a btrfs volume for many of the benefirts of raid. (No btrfs for boot, as GRUB is not yet very BTRFS aware!) I have not tested this, but as btrfs matures it may make some of these raid applications obsolete or of restricted application.

What is you use case here? How do you plan to use this server, and what is your priority?
 
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Old 04-03-2015, 09:44 AM   #3
TB0ne
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Quote:
Originally Posted by madhan.dctrvs View Post
I want to build some servers with HP Proliant Gen 8 servers with RHEL 6.0 Box.Which method of build is best means Hardware raid or root disk morroring.Please advice to build effectively.Thanks in advance.
And to add to what wpeckham said, the most effective thing you can do for new servers, is to load the LATEST versions of the OS...RHEL6 is a bit old, with 7 being the latest. Also, you need to PAY FOR RHEL...because if you put a server into production, you need it to be stable. Without a paid-for subscription to the Red Hat network, you WILL NOT get patches, bugfixes, security fixes; you will very quickly wind up with an unstable, insecure server.

Also, your question of "hardware RAID" is vague, at best. Do you mean RAID 1? 5? 10? What kind of disks? Attached how? Mirroring IS RAID1. What are you trying to accomplish with hardware RAID? What will these servers do? If you're buying new servers from HP, then why don't you ask your HP sales rep for what they recommend? They probably have controllers and disks that are made for those servers.
 
Old 04-06-2015, 12:12 AM   #4
madhan.dctrvs
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Hi wpeckham / TB0ne,

Thanks for your reply in guiding this thread and i have got clarified and this server build plan is now ready to be executed.This server was supplied with three Disks ( 500GB * 3 ).Planned to make it RAID-1 ( Hardware ) and one is going to be an Hotspare.Storage is not a concern because this was test server.also 1 TB Storage (External) was allocated from storage for storing purpose. But the RHEL is 6 ( this was an client requirement) .Can i go ahead with build ? Please suggest if any ideas.
 
Old 04-06-2015, 06:35 AM   #5
wpeckham
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Not a concern.... ???

So, this is a test server? What kind of operation does it test?

It is difficult to give good advice without adequate information about the purpose.

RHEL6 is a good version and in current support. If that is the client restriction, I see no basis to argue.

I see no reason not to start your build, but there is a LOT we cannot see with only what you have posted to go on.
 
Old 04-06-2015, 01:18 PM   #6
TB0ne
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Quote:
Originally Posted by madhan.dctrvs View Post
Hi wpeckham / TB0ne,
Thanks for your reply in guiding this thread and i have got clarified and this server build plan is now ready to be executed.This server was supplied with three Disks ( 500GB * 3 ).Planned to make it RAID-1 ( Hardware ) and one is going to be an Hotspare.
Ok...so your only concern now is what your disk controller can do. Can it set the array up as you want?
Quote:
Storage is not a concern because this was test server.also 1 TB Storage (External) was allocated from storage for storing purpose. But the RHEL is 6 ( this was an client requirement)
You need to find out WHY they specified RHEL6, when it is a bit old, and there is very little reason to use it, versus a new release. While wpeckham is absolutely correct, and RHEL6 is supported, the reasons behind this need to be determined. If it's "just because", that's not a good reason...especially since this is a TEST server. For testing, wouldn't it be better to see if the NEW version can support the older software? Give you an upgrade path? Identify problems?? You're not going to be able to use RHEL 6 forever, and you will eventually be FORCED to upgrade.
Quote:
Can i go ahead with build ? Please suggest if any ideas.
Yes...load RHEL 7, and be sure you PAY FOR RHEL, as said before.

Last edited by TB0ne; 04-06-2015 at 01:20 PM.
 
Old 04-06-2015, 11:41 PM   #7
madhan.dctrvs
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Hi wpeckham / TB0ne,

Thanks once again.We need get approval from the top management for changing it into rhel 7.0 in the client place.Hence we may let them use rhel6.x.Thank you so much for sharing valuable ideas.Keep supporting me in the upcoming posts.
 
  


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