Re: Raid 5, xfs or reiserfs


Subject: Re: Raid 5, xfs or reiserfs
From: Arthur Corliss (acorliss@nevaeh-linux.org)
Date: Wed Feb 11 2004 - 12:56:30 AKST


On Wed, 11 Feb 2004, Mike Tibor wrote:

> One thing I would point out is that as soon as you introduce Linux
> software raid into the picture, your chances for encountering problems go
> up significantly. That's not to say that Linux software raid isn't
> good--I personally think it's awesome--however I've had problems with at
> least raid+smp, raid+nfs, raid+xfs, raid+jfs and raid+reiser3. For each
> of those cases, one thing might work perfectly fine, but as soon as I
> brought software raid into the picture, I had problems (kernel panics, fs
> corruption, etc.) Note none of my comments apply to hardware raid, just
> Linux software raid.

Good point, I don't think which type was specified. Having followed the xfs
mailing lists, though, all of hte problems lately that I've heard about were
very hardware-specific. You might want to check the archives beforehand.
That said, I haven't heard of any recent problems using LVM + XFS, which is
what I use. That supports striping and mirroring as well.

> Most people aren't aware of them, but there are mount options for ext3
> that can really help performance. "data=journal" is supposed to help
> hugely in most situations. The options are described in the mount man
> page.

XFS has the same capability, as well as specifying other devices for raw I/O
storage, etc. Having only used JFS on AIX boxes, I can't say for sure what
your options are with that.

        --Arthur Corliss
          Bolverk's Lair -- http://arthur.corlissfamily.org/
          Digital Mages -- http://www.digitalmages.com/
          "Live Free or Die, the Only Way to Live" -- NH State Motto
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