Am Dienstag, 21. Juni 2011 05:54:26 schrieb Dan Harris: > I'm looking for advice from the I/O gurus who have been in the SSD game > for a while now. > > I understand that the majority of consumer grade SSD drives lack the > required capacitor to complete a write on a sudden power loss. But, > what about pairing up with a hardware controller with BBU write cache? > Can the write cache be disabled at the drive and result in a safe setup? > > I'm exploring the combination of an Areca 1880ix-12 controller with 6x > OCZ Vertex 3 V3LT-25SAT3 2.5" 240GB SATA III drives in RAID-10. Has > anyone tried this combination? What nasty surprise am I overlooking here? > > Thanks > -Dan Wont work. period. long story: the loss of the write in the ssd cache is substantial. You will loss perhaps the whole system. I have tested since 2006 ssd - adtron 2GB for 1200 Euro at first ... i can only advice to use a enterprise ready ssd. candidates: intel new series , sandforce pro discs. i tried to submit a call at apc to construct a device thats similar to a buffered drive frame (a capacitor holds up the 5 V since cache is written back) , but they have not answered. so no luck in using mainstream ssd for the job. loss of the cache - or for mainstream sandforce the connection - will result in loss of changed frames (i.e 16 Mbytes of data per frame) in ssd. if this is the root of your filesystem - forget the disk. btw.: since 2 years i have tested 16 discs for speed only. i sell the disc after the test. i got 6 returns for failure within those 2 years - its really happening to the mainstream discs. -- Mit freundlichen Grüssen Anton Rommerskirchen -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
