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Re: XFS on SSD, log/metadat on spindle?

To: Tore Høivaag <tore.hoivaag.larsen@xxxxxxxxxxxxxx>
Subject: Re: XFS on SSD, log/metadat on spindle?
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Mon, 27 Sep 2010 22:46:39 +0200
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
In-reply-to: <CFFC47E79E870F4EBAD0CA24D8CD7652ECD04ECD67@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Organization: Intellique
References: <CFFC47E79E870F4EBAD0CA24D8CD7652ECD04ECD67@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Le Mon, 27 Sep 2010 19:46:54 +0100 vous écriviez:

>    anyone have experience with (c)xfs on SSD enabled raid?    LSI
> 7900 (aka IS4600 aka IBM DS5300) with mixed SSD and FC drives.  LSI
> FC4600 enclosure.

Yes, it works well, and about 50% faster on small IO (tested with
Adaptec 52445 though). Actually it largely depends upon the way you
distribute IO on the array, but it's basically comparable to a huge
read cache.

I also tried putting the XFS log on an SSD a couple of years ago, it's
really fast (but quite a waste of a good SSD).

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