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

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

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