SSD recommendations for ZFS cache/log

[Chris BeHanna]

On Nov 13, 2012, at 21:51, Stephen McKay <smckay at 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?

Thanks,
-- 
Chris BeHanna
chris at behanna.org