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Re: Xfs delaylog hanged up

To: xfs@xxxxxxxxxxx
Subject: Re: Xfs delaylog hanged up
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Tue, 23 Nov 2010 16:14:16 -0600
In-reply-to: <20101123204609.GW22876@dastard>
References: <4CEAC412.9000406@xxxxxxxxxxxxx> <20101122232929.GJ13830@dastard> <4CEBA2D5.2020708@xxxxxxxxxxxxx> <20101123204609.GW22876@dastard>
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Dave Chinner put forth on 11/23/2010 2:46 PM:

> I've been unable to reproduce the problem with your test case (been
> running over night) on a 12-disk, 16TB dm RAID0 array, but I'll keep
> trying to reproduce it for a while. I note that the load is
> generating close to 10,000 iops on my test system, so it may very
> well be triggering load related problems in your raid controller...

Somewhat off topic, but how are you generating 10,000 IOPS by carving a
16TB LUN/volume from 12 x 2TB SATA disk spindles?  Such drives aren't
even capable of 200 seeks per second.  Even if they were you'd top out
at less than 2,500 IOPS (random).  16TB/12=1.33 TB per disk.  No such
capacity disk exists.  So I assume you're using 12 x 2TB disks and
slicing/dicing out 16TB.  What am I missing Dave?


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