Re: [Xen-users] Xen clients and RAID

["David Stockwell" <dstockwell@xxxxxxxxxxxxxxxxx>]

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.
>
> --
> Javier
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...

DS 

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