Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1

On Tue, Apr 19, 2011 at 2:07 PM, Greg Smith <greg@2ndquadrant.com> wrote:
> On 04/19/2011 05:15 AM, Laurent Laborde wrote:
>>
>> 2 kingston V+100 500GB

4x250GB in Raid10 (see my 2nd post)

> Thanks for the performance report.  The V+100 is based on a Toshiba T6UG1XBG
> controller, and it doesn't have any durable cache from either a battery or
> capacitor.  As such, putting a database on that drive is very risky.  You
> can expect the database to be corrupted during an unusual power outage
> event.  See http://wiki.postgresql.org/wiki/Reliable_Writes for more
> information.
>
> At this point most people considering one of Kingston's drives for a
> database would be better off getting an Intel 320 series drive, which is
> around the same price but doesn't have this issue.

If we use them (unlikely), recovery in case of power outage isn't a
problem, as we will use it on slave database (using Slony-I) that can
be created/destroyed at will.
And, anyway, our slave have fsync=off so the battery won't change
anything in case of power outage :)

i am currently testing on a single V+100 250GB (without raid).
Report will follow soon :)

--
Laurent "ker2x" Laborde
Sysadmin & DBA at http://www.over-blog.com/