Mike Bird mgb-ubuntu at
Mon Jan 2 00:48:48 UTC 2006

On Sun, 2006-01-01 at 15:33, Anders Karlsson wrote:
> If you intend running a production system that needs four or five
> nines reliability, then you need a proper HW RAID solution. Any of the
> el-cheapo fakeraid (Siimage, Promise etc onboard "raid") is not going
> to cut it.
> Only a solution where the controller handles the RAID operations, and
> you get presented a logical disc will do IMO. Once you start having to
> rely on userspace tools to set up the logical drives, you have gone
> from production environment to "happy amateur playing at home".

I'd be interested in seeing your statistics comparing reliability
of hardware versus software RAID.  We run about fifty MDs here.
Never had a serious problem due to the MD software,  although the
infinite retries on resync errors can be annoying.

--Mike Bird

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