Re: Battery Backed Cache for RAID

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