From: Chris Cox <chris_cox@stercomm.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] LVM2 striping or md raid0
Date: Tue, 25 Sep 2007 16:26:30 -0500 [thread overview]
Message-ID: <46F97D06.60306@stercomm.com> (raw)
In-Reply-To: <f73e16539766341385fcc97b8915a65f@memcpy.com>
Kelly Byrd wrote:
>
>
> On Sat, 22 Sep 2007 18:36:41 -0700, Kelly Byrd <kbyrd-lvm@memcpy.com>
> wrote:
>> Two questions really:
>>
>> I'm going to use lvm to partition up 4 equal size partitions.
>> I can either use the md driver to RAID0 them the make /dev/md0
>> my PV, or just use the 4 partitions as PVs and stripe across
>> them.
>>
>> How does lvm2 striping compare with md's RAID0 as far as speed?
>> I don't quite get how it stripes on chunk sizes smaller than
>> a PE, but a 4MB stripe size seems crazy.
>>
>> Finally, what's the tuning advice for LVM2 striping? I usually
>> create my RAID0 or RAID5 with 128k chunk sizes, is it similar
>> for LVM2 striping?
>>
>>
>
> anyone?
This is merely my own opinion, but md was designed to be
THE software raid mechanism. So, my preference would be
to establish a RAID md device and make that into a PV.
Of course, I don't believe in non-RAID (i.e. RAID0) anyhow.
Maybe someone else will chime in on this one.
--
Chris Cox
Sr. Unix Sys Admin
next prev parent reply other threads:[~2007-09-25 21:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-23 1:36 [linux-lvm] LVM2 striping or md raid0 Kelly Byrd
2007-09-25 19:49 ` Kelly Byrd
2007-09-25 21:26 ` Chris Cox [this message]
2007-09-26 1:05 ` Stuart D. Gathman
2007-09-26 1:15 ` Stuart D. Gathman
[not found] <4b9a0d7ea026e7ca31fcfc9063443f08@memcpy.com>
2007-09-25 21:40 ` Kelly Byrd
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