He can loose 1 disk from any 2 RAID1 arrays. And then 2 disks from the other 2 RAID1 arrays. A total of 6 of 8 disks can fail if chosen correctly. I would go with an 8 disk RAID6, which would give the space of 6 disks and support any 2 disks failing. Or a 7 disk RAID6 with 1 spare, but I think that is over kill. Guy } -----Original Message----- } From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- } owner@xxxxxxxxxxxxxxx] On Behalf Of Mario 'BitKoenig' Holbe } Sent: Thursday, February 02, 2006 1:42 PM } To: linux-raid@xxxxxxxxxxxxxxx } Subject: Re: RAID 16? } } Matthias Urlichs <smurf@xxxxxxxxxxxxxx> wrote: } > Hi, David Liontooth wrote: } >> * define 4 pairs of RAID 1 with an 8-port 3ware 9500S card * the OS } will } > Hmm. You'd have eight disks, five(!) may fail at any time, giving you } } Four, isn't it? } RAID6 covers the failure of 2 of the underlying RAID1s, which, in turn, } means failures of 2 disks each, so four. } Sometimes even 5, yes - given the right ones fail. } } } regards } Mario } -- } We are the Bore. Resistance is futile. You will be bored. } } - } To unsubscribe from this list: send the line "unsubscribe linux-raid" in } the body of a message to majordomo@xxxxxxxxxxxxxxx } More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
