Re: Plug-pull testing worked, diskchecker.pl failed

On Wed, Nov 7, 2012 at 2:01 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> On Wed, Nov 7, 2012 at 01:53:47PM -0700, Scott Marlowe wrote:
>> On Wed, Nov 7, 2012 at 11:59 AM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
>> > On Sat, Oct 27, 2012 at 05:41:02PM +1100, Chris Angelico wrote:
>> >> On Sat, Oct 27, 2012 at 4:26 PM, Greg Smith <greg(at)2ndquadrant(dot)com> wrote:
>> >> > In general, through, diskchecker.pl is the more sensitive test. If it
>> >> > fails, storage is unreliable for PostgreSQL, period. It's good that you've
>> >> > followed up by confirming the real database corruption implied by that is
>> >> > also visible. In general, though, that's not needed. Diskchecker says the
>> >> > drive is bad, you're done--don't put a database on it. Doing the database
>> >> > level tests is more for finding false positives: where diskchecker says the
>> >> > drive is OK, but perhaps there is a filesystem problem that makes it
>> >> > unreliable, one that it doesn't test for.
>> >>
>> >> Thanks. That's the conclusion we were coming to too, though all I've
>> >> seen is lost transactions and not any other form of damage.
>> >>
>> >> > What SSD are you using? The Intel 320 and 710 series models are the only
>> >> > SATA-connected drives still on the market I know of that pass a serious
>> >> > test. The other good models are direct PCI-E storage units, like the
>> >> > FusionIO drives.
>> >>
>> >> I don't have the specs to hand, but one of them is a Kingston drive.
>> >> Our local supplier is out of 320 series drives, so we were looking for
>> >> others; will check out the 710s. It's crazy that so few drives can
>> >> actually be trusted.
>> >
>> > Yes. Welcome to our craziness!
>>
>> Is there a comprehensive list of drives that have been tested on the
>> wiki somewhere? Our current choices seem to be the Intel 3xx series
>> which STILL suffer from the "whoops I'm now an 8MB drive" bug and the
>> very expensive SLC 7xx series Intel drives, the Hitachi Ultrastar
>> SSD400M, and the OCZ Vertex 2 Pro. Any particular recommendations
>> from those or other series from anyone would be greatly appreciated.
>
> No, I know of no official list. Greg Smith and I have tried to document
> some of this on the wiki:
>
> http://wiki.postgresql.org/wiki/Reliable_Writes

Well I may get a budget at work to do some testing so I'll update that
list etc. This has been a good thread to get me motivated to get
started.