Date: Mon, 8 Oct 2012 11:32:14 -0500 From: Dustin Wenz <dustinwenz@ebureau.com> To: freebsd-fs@freebsd.org Subject: Imposing ZFS latency limits Message-ID: <6116A56E-4565-4485-887E-46E3ED231606@ebureau.com>
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I'm trying to find a way to get lower read latency in ZFS when there is = a failing disk in a mirror. The specific failure mode that I'm trying to = handle is when a disk takes significantly longer than usual to respond = to read requests, but is not so far gone that the OS drops it from the = bus. In that case, the whole pool can become much less responsive than I = think it needs to be. Since ZFS has access to the data I'm reading through other members in a = mirror, I would like ZFS to defer to the redundant disks when individual = disk latency exceeds some threshold that I would define. Is there any = provision for this in the FreeBSD ZFS implementation? - .Dustin
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