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Re: XFS hangs and freezes with LSI 9265-8i controller on high i/o

To: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Subject: Re: XFS hangs and freezes with LSI 9265-8i controller on high i/o
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Wed, 13 Jun 2012 11:12:15 -0500
Cc: xfs@xxxxxxxxxxx
In-reply-to: <6637532.ZKYiNbq2uo@saturn>
References: <4FD66513.2000108@xxxxxxxxx> <4FD8552C.4090208@xxxxxxxxx> <20120613115934.GX32601@xxxxxxxxxxxxxxx> <6637532.ZKYiNbq2uo@saturn>
Reply-to: stan@xxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1
On 6/13/2012 7:13 AM, Michael Monnerie wrote:

> Write Cache DISABLED if Bad BBU

This is the LSI/3ware firmware default policy Michael, so every user is
safe out-of-the-box.  If the BBU/FBU is not present (never installed),
or the control logic determines it is not functioning properly, the
firmware disables writeback caching.

In absence of paying attention to logs/alerts, one will know pretty
quickly when the BBU has failed, as write performance with many/most
workloads will fall off a cliff.

-- 
Stan


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