Bear in mind you will lose data if the raid controller itself fails (or the cache memory module). Many solutions have mirrored cache for this reason. But that's more $$, depending on the risks you want to take.
Quoting Arjen van der Meijden <[EMAIL PROTECTED]>: > On 14-9-2005 22:03, Alvaro Herrera wrote: > > On Wed, Sep 14, 2005 at 11:28:43AM -0700, Jeffrey W. Baker wrote: > > > >>On Wed, 2005-09-14 at 11:25 -0700, Peter Darley wrote: > >> > >>Actually the cache will just hold its contents while the power is out. > >>When the power is restored, the RAID controller will complete the writes > >>to disk. If the battery does not last through the outage, the data is > >>lost. > > > > > > Just curious: how long are the batteries supposed to last? > > For the LSI-Logic MegaRaid 320-2e its about 72 hours for the standard > 128MB version. Their SATA2-solution offers 32 and 72 hour-options. So I > assume its "in the order of days" for most RAID controllers. > > Best regards, > > Arjen van der Meijden > > ---------------------------(end of broadcast)--------------------------- > TIP 6: explain analyze is your friend > ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org