Date: Tue, 3 Apr 2012 20:50:33 -0500 (CDT) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Julian Elischer <julian@freebsd.org> Cc: FreeBSD Current <current@freebsd.org>, fs@freebsd.org Subject: Re: "trim/discard" success story Message-ID: <alpine.GSO.2.01.1204032046130.1678@freddy.simplesystems.org> In-Reply-To: <4F7BA173.6050903@freebsd.org> References: <4F7BA173.6050903@freebsd.org>
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On Tue, 3 Apr 2012, Julian Elischer wrote: > > for flash drives this is great news.. > Now if ZFS would get trim support, that too would be great. The major unknown issue with trim is how well the drives schedules/defers the trim operation so that it does not interfer with other I/Os. Also, it would be really bad if the drive applied trim after the block had been re-allocated for a write. It would also be really bad if the drive loses unrelated data if there is a power fail during trim. If writes get blocked by a pending trim, then trim would not help very much. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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