SSD recommendations for ZFS cache/log

[Bryan Drewery]

On 11/13/2012 10:18 PM, Chris BeHanna wrote:
> 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?
> 

I've had more than 1 UPS battery die on me, resulting in instant shutoff.

> Thanks,
>