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Re: [Xen-users] Xen clients and RAID

Hello Javier,

----- Original Message ----- From: "Javier Guerra" <javier@xxxxxxxxxxx>

On Fri, Feb 27, 2009 at 9:51 AM, David Stockwell
<dstockwell@xxxxxxxxxxxxxxxxx> wrote:
either Linux software
RAID, or Fake RAID (which is the same thing).

nope, they're not the same.

FakeRAID is the name given to cards advertised as RAID cards, but in
fact are only multiport controllers, and hidden in the drivers is a
software RAID.

the difference is that with FakeRAID you're stuck with a proprietary
nonmaintained RAID. if you lose the card, you lose the RAID and all
data; while Linux software RAID is usable no matter how you connect
the drives.

even if you lose your only 24-port SATA controller, you could get 6
mainboards, plug 4 drives on each, share each disk via GNBD, access
all 24 from another host.... and you'll see your RAID and all data.


Thanks for the clarification; I knew the controller would be an issue with SCSI RAID (long sad experience), but did not realize that the same issue exists with FakeRAID. Sure am glad I configured all of my drives (only 4 at the moment) as independent AHCI drives (not RAID).

The learning journey continues...


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