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Date: Wed, 13 Jun 2012 13:59:34 +0200
From: Andre Noll <maan@systemlinux.org>
Subject: Re: XFS hangs and freezes with LSI 9265-8i controller on high i/o
Message-ID: <20120613115934.GX32601@systemlinux.org>
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To: Matthew Whittaker-Williams <matthew@xsnews.nl>
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On Wed, Jun 13, 10:54, Matthew Whittaker-Williams wrote:
> Current Cache Policy: WriteBack, ReadAheadNone, Direct, Write Cache OK if=
 Bad BBU
> Disk Cache Policy   : Disk's Default

Check if these two policy settings are what you really want. AFAICT
they can make a huge difference, depending on the workload.

Here's what gives best performance. Of course these are also the most
risky settings, so use with care:

	Current Cache Policy: WriteBack, ReadAdaptive, Cached, Write Cache OK if B=
ad BBU
	Disk Cache Policy: Enabled

To select these settings for all lds on adapter 0, use

	CLI=3DMegaCli; lsi_adapter_number=3D0
        $CLI -ldsetprop CachedBadBBU -LALL -a$lsi_adapter_number &&
        $CLI -ldsetprop -Cached -LAll -a$lsi_adapter_number &&
        $CLI -ldsetprop -EnDskCache -LAll -a$lsi_adapter_number &&
        $CLI -ldsetprop WB -LALL -a$lsi_adapter_number

Best
Andre
--=20
The only person who always got his work done by Friday was Robinson Crusoe

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