From: David Greaves <david@dgreaves.com>
To: Stephan van Hienen <raid@a2000.nu>
Cc: linux-raid@vger.kernel.org
Subject: Re: readahead (blockdev --setra) with sw raid(5)?
Date: Sat, 27 Nov 2004 23:52:29 +0000 [thread overview]
Message-ID: <41A9133D.5000809@dgreaves.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0411272328270.16979@adsl.a2000.nu>
I routinely use --setra 4096 on the underlying devices, the md array
devices and the lvm devices
I am generally reading 1-2 gigabyte files.
I use XFS and it is often suggested as a good fs (though I think there
may be some XFS/nfs issues with 2.6 at the moment - see lkml)
David
Stephan van Hienen wrote:
> Hi,
>
> just saw a 3ware document with some hints for hardware raid5
> they advice to use blockdev --setra 16384
>
> since i'm not using 3ware hardware raid
> (i'm using 2*7500 3ware's with sw raid5 over 14 disks)
> i'm wondering if --setra can still improve my raid performance
>
> any hints about this ?
> or some other hints, improvements on filesystem ?
> i'm currently using blocksize 128, maybe switching to 256 helps ?
> (with large files)
> -
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next prev parent reply other threads:[~2004-11-27 23:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-27 22:31 readahead (blockdev --setra) with sw raid(5)? Stephan van Hienen
2004-11-27 23:52 ` David Greaves [this message]
2004-11-28 10:46 ` Stephan van Hienen
2004-11-30 2:18 ` Neil Brown
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