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DragonFly users List (threaded) for 2012-08
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Re: solid-state drives

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, 2 Aug 2012 13:51:08 -0700 (PDT)

:On Wed, Aug 01, 2012 at 06:16:13PM -0400, Pierre Abbat wrote:
:> This is a spinoff of the Aleutia question, since Aleutia puts SSDs in 
:> computers. How does the periodic Hammer job handle SSDs? Does reblocking do 
:> anything different than on an HDD? If a computer has an SSD and an HDD, which 
:> should get the swap space?
:> Pierre
:On my workstation I use an SSD for the root filesystem, swapcache and
:The current configuration has snapshots set to 1d (10d retention time)
:and reblocking is set to 7d (1m runtime). All other option (prune,
:rebalance, dedup and recopy) are disabled.
:Currently it is running fine, but in my opinion running swapcache on a
:workstation that just runs for a couple of hours is not always
:necessary. I'm just running this setup to play with the swapcache and
:the SSD, because I think it is a very nice feature.

    You will definitely want to turn pruning on, it doesn't do all that much
    I/O and its needed to clean up the fine-grained snapshots.  Rebalance,
    dedup, and recopy can be left turned off.

					Matthew Dillon 

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