From: Philip Molter <philip@corp.texas.net>
To: linux-raid@vger.kernel.org
Subject: Re: Software RAID & Filesystem Cache
Date: Sat, 07 Aug 2004 09:04:48 -0500 [thread overview]
Message-ID: <4114E180.7000902@corp.texas.net> (raw)
In-Reply-To: <4112731A.5030000@h3c.com>
> <berlin>/sys % find . | grep ahead
> ./block/hdf/queue/read_ahead_kb
> ./block/hdg/queue/read_ahead_kb
> ./block/hdc/queue/read_ahead_kb
> ./block/hda/queue/read_ahead_kb
Yeah, these definitely have no effect on how much is being read from the
disks. There is a direct correlation, though, between the chunk size on
the raid0 portion of the raid10 and the amount of data that is read. If
you increase the chunk size, you increase not just the number of bytes
read from the disks.
There's something seriously messed up with software RAID10. It's
practically unusable for high-load situations where before it was
perfectly fine.
next prev parent reply other threads:[~2004-08-07 14:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-05 17:49 Software RAID & Filesystem Cache Mike Hardy
2004-08-05 18:54 ` Philip Molter
2004-08-07 14:04 ` Philip Molter [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-08-05 16:31 Philip Molter
[not found] ` <411268C7.9070804@h3c.com>
2004-08-05 17:34 ` Philip Molter
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