| From: | "Welty, Richard" <richard(dot)welty(at)bankofamerica(dot)com> |
|---|---|
| To: | John A Meinel <john(at)arbash-meinel(dot)com> |
| Cc: | Pgsql-Performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Battery Backed Cache for RAID |
| Date: | 2005-09-14 20:46:47 |
| Message-ID: | A209FE4DA934614CAF3F5BD8E5E14290B0DD70@ex2k.bankofamerica.com |
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| Lists: | pgsql-performance |
John A Meinel wrote:
>The recent *cheap* version of a ramdisk had battery backup for 16 hours.
>(Very expensive ramdisks actually have enough battery power to power a
>small hard-drive to dump the contents into).
>I'm guessing for a RAID controller, the time would be in the max 1 day
>range.
i think some will go a bit longer. i have seen an IBM ServeRaid (rebranded
mylex in this particular case) keep its memory after being pulled for a
remarkably long period of time.
no guarantees, though, so i'm not actually going to say how long so that nobody
gets unreasonable expectations.
richard
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