Re: SSD + RAID

On Fri, 13 Nov 2009, Greg Smith wrote:
> In order for a drive to work reliably for database use such as for 
> PostgreSQL, it cannot have a volatile write cache.  You either need a write 
> cache with a battery backup (and a UPS doesn't count), or to turn the cache 
> off.  The SSD performance figures you've been looking at are with the drive's 
> write cache turned on, which means they're completely fictitious and 
> exaggerated upwards for your purposes.  In the real world, that will result 
> in database corruption after a crash one day.

Seagate are claiming to be on the ball with this one.

http://www.theregister.co.uk/2009/12/08/seagate_pulsar_ssd/

Matthew

-- 
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