Date: Tue, 13 Nov 2012 22:27:06 -0600 From: Bryan Drewery <bryan@shatow.net> To: Chris BeHanna <chris@behanna.org> Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: SSD recommendations for ZFS cache/log Message-ID: <50A31D9A.7020200@shatow.net> In-Reply-To: <943159E4-8824-4767-96E1-89E8EC69DCDF@behanna.org> References: <CAFHbX1K-NPuAy5tW0N8=sJD=CU0Q1Pm3ZDkVkE%2BdjpCsD1U8_Q@mail.gmail.com> <57ac1f$gf3rkl@ipmail05.adl6.internode.on.net> <943159E4-8824-4767-96E1-89E8EC69DCDF@behanna.org>
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On 11/13/2012 10:18 PM, Chris BeHanna wrote: > On Nov 13, 2012, at 21:51, Stephen McKay <smckay@internode.on.net> wrote: > >> [...lots of good advice about measuring, and lots of good advice about L2ARC...] >> >> I have no way to determine in advance the behaviour of an SSD on >> power failure so I assume all the ones I can afford have bad >> behaviour. :-) I know that expensive ones contain capacitors so >> that power failures do not corrupt their contents. By the nature >> of advertising (from which we know that any feature not excessively >> hyped must therefore not be supported), we must conclude that other >> SSDs by normal operation corrupt blocks on power failure. > > If you'll pardon what may be an ignorant question, does this matter if you have your machine on a UPS, especially if you run upsmon or nut to do a graceful shutdown when there are n minutes of battery remaining? > I've had more than 1 UPS battery die on me, resulting in instant shutoff. > Thanks, >
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