| From: | Arjen van der Meijden <acmmailing(at)tweakers(dot)net> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | "Jeffrey W(dot) Baker" <jwbaker(at)acm(dot)org>, Peter Darley <pdarley(at)kinesis-cem(dot)com>, Pgsql-Performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Battery Backed Cache for RAID |
| Date: | 2005-09-14 20:47:35 |
| Message-ID: | 43288C67.3000209@tweakers.net |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
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
| From | Date | Subject | |
|---|---|---|---|
| Next Message | mudfoot | 2005-09-14 21:58:28 | Re: Battery Backed Cache for RAID |
| Previous Message | Welty, Richard | 2005-09-14 20:46:47 | Re: Battery Backed Cache for RAID |