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Re: XFS/LVM/Multipath on a single RAID volume

To: Dave Hall <kdhall@xxxxxxxxxxxxxx>
Subject: Re: XFS/LVM/Multipath on a single RAID volume
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Wed, 25 Feb 2015 12:21:13 +0100
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, stan@xxxxxxxxxxxxxxxxx, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <54ECF573.9050106@xxxxxxxxxxxxxx>
Organization: Intellique
References: <5143F94C.1020708@xxxxxxxxxxxxxxxxx> <20130316072126.GG6369@dastard> <515082C3.2000006@xxxxxxxxxxxxxx> <515361B5.8050603@xxxxxxxxxxxxxxxxx> <5155F2B2.1010308@xxxxxxxxxxxxxx> <20130331012231.GJ6369@dastard> <515C3BF3.60601@xxxxxxxxxxxxxx> <51684382.50008@xxxxxxxxxxxxxx> <5168AC0B.5010100@xxxxxxxxxxxxxxxxx> <516C649A.8010003@xxxxxxxxxxxxxx> <20130416161841.GB13938@destitution> <54EA67B7.30805@xxxxxxxxxxxxxx> <20150223121812.5077ff07@xxxxxxxxxxxxxxxxxxxx> <54ECF573.9050106@xxxxxxxxxxxxxx>
Le Tue, 24 Feb 2015 17:04:35 -0500
Dave Hall <kdhall@xxxxxxxxxxxxxx> Ãcrivait:

> The new hardware is an Infortrend with 16 x 2TB 6Gbps SAS drives.  It 
> has one controller with dual 6Gbps SAS ports.  The server currently
> has two 3Gbps SAS HBAs.

On my experience with these kinds of controllers, they perform quite
poorly with more than 1 RAID-6 array. I'd go for a single RAID-6
array. Then as you said you'll have to do multipath LVM to create two
LVs to stripe together to use both your HBAs and get some more

However with only 16 7k RPM drives you can't hope much more than 1.5
GByte/s, which is achievable with only one 3Gb SAS HBA...

Emmanuel Florac     |   Direction technique
                    |   Intellique
                    |   <eflorac@xxxxxxxxxxxxxx>
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