[nycbug-talk] Fwd: Adaptec AAC raid support

pete wright nomadlogic
Mon Mar 21 15:23:42 EST 2005

On Mon, 21 Mar 2005 14:04:54 -0500, Marco Scoffier <marco at metm.org> wrote:
> On Mon, Mar 21, 2005 at 01:15:46PM -0500, Isaac Levy wrote:
> >With that stated, as the dust is settling with this issue- and myself
> >being a bit outside of the daily-use OpenBSD camp, what is everyone
> >going to use for RAID on OpenBSD?  (I'm particularly interested in sata
> >hardware raid...?!?)
> >
> What I wonder is if hardware is really the way to go.  What's the difference in
> overhead btw say a hardware raid5 and putting the card in jbod mode and running
> raidctl.  [ I have not googled this lately ]

I think it probably depends on what you are going to be using your
RAID setup in.  For example on some systems I've worked on where we
have needed high/sustained throughput we actually used a mixture of
hardware RAID and software mirroring/parity management.

The main benefit I see with hardware RAID controllers are Battery
Backup Units and higher through-put with lower overhead, and lower
system utilization when rebuilding disks.  Also, to fully utilize
features of the BBU for example, one needs interact directly with the
SCSI controller.


Pete Wright
NYC's *BSD User Group

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