Date: Tue, 13 Nov 2012 22:18:54 -0600 From: Chris BeHanna <chris@behanna.org> To: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: SSD recommendations for ZFS cache/log Message-ID: <943159E4-8824-4767-96E1-89E8EC69DCDF@behanna.org> In-Reply-To: <57ac1f$gf3rkl@ipmail05.adl6.internode.on.net> References: <CAFHbX1K-NPuAy5tW0N8=sJD=CU0Q1Pm3ZDkVkE%2BdjpCsD1U8_Q@mail.gmail.com> <57ac1f$gf3rkl@ipmail05.adl6.internode.on.net>
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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 L2A= RC...] >=20 > 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 h= ave your machine on a UPS, especially if you run upsmon or nut to do a grace= ful shutdown when there are n minutes of battery remaining? Thanks, --=20 Chris BeHanna chris@behanna.org=
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