Re: Use RAID-6!

[Roy Sigurd Karlsbakk <roy@karlsbakk.net>]

> I personally don't even trust RAID 6. All our servers use three-disk
> RAID 1 setups, with disks from at least two different manufacturers to
> prevent against firmware bricking (although this is becoming more and
> more difficult as the industry consolidates).

You can *never* trust RAID alone. Even with ZFS, you can have problems taking down a whole pool, even with RAIDz3 and ZFS' checksumming. A power surge can take down half (or even all) the drives in the array, and even with three-way mirrors, the chances are good your pool will die.

So, choose something decent, like RAID-6 (RAIDz2) or mirrors, three-way if you're paranoid, and keep a good backup, preferably offsite and on tape. Tapes in a tape library can't be damaged much of a power surge (except perhaps those in the reader).

Vennlige hilsener / Best regards

roy
--
Roy Sigurd Karlsbakk
(+47) 98013356
roy@karlsbakk.net
http://blogg.karlsbakk.net/
GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt
--
I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med xenotyp etymologi. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk.
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html