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[ale] LAMP performance
- Subject: [ale] LAMP performance
- From: brian at polibyte.com (Brian Pitts)
- Date: Tue, 14 Sep 2010 09:04:15 -0400
- In-reply-to: <20100913175801.07fa1140@zaphod>
- References: <[email protected]> <[email protected]> <20100913163129.789ab459@zaphod> <[email protected]> <20100913175801.07fa1140@zaphod>
On 09/13/2010 05:58 PM, Pat Regan wrote:
> File systems like ZFS are smart enough to work with fast and slow media
> in the same pool. You could effectively have an array of slower
> spinning media to cover your reads and a pair of SSDs to cache your
> writes. I haven't gotten to play with this, though, so I don't know
> how well it works in practice :)
Drifting further OT...
I'm not sure ZFS has a way to spend up all writes, similar to how you
can speed up all reads by adding a L2ARC. However, you can certainly
speed up synchronous writes by adding a good solid state drive as a
separate intent log device. I got a nice boost after adding an OCZ
Vertex 2 as one. Watching zilstat on the server while running filebench
against an NFS export from it is pretty fun.
--
All the best,
Brian Pitts