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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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