Re: Advice: Hardware vs. Software RAID5
On Wed, Jan 16, 2008 at 09:28:30AM -0800, David Brodbeck wrote:
> On Jan 15, 2008, at 6:14 PM, Gregory Seidman wrote:
> >On Tue, Jan 15, 2008 at 03:40:15PM -0800, tofu.oni@gmail.com wrote:
> >>On Jan 15, 9:10 am, Gregory Seidman <gsslist
> >>+deb...@anthropohedron.net> wrote:
> >>I have an existing setup that uses four 120G drives in software
> >>RAID 5
> >>under windows 2000, and I learned that it's best to have exactly the
> >>same kind of drives. Mixing WD and Seagate caused problems. Is that
> >>a RAID 5 idiosyncrasy or a windows thing?
> >
> >I've heard it recommended for any RAID, but I've never had a problem
> >under
> >Linux sw RAID with differing brands of drives.
>
> Two drives from different manufacturers that are the same advertised
> size may not have exactly the same formatted size. This isn't a
> problem when you create an array; the extra space on the slightly
> larger drives is just wasted. It can be a problem if you have a
> failed disk and the replacement drive is slightly smaller than the
> others, however.
Or, create a partition on each drive that is exactly the same size, then
make your arrays with eg /dev/sda1 and /dev/sdb1 instead of sda and sdb.
Doug.
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