Hello Ingo , Yes, Yes, yes ........ Thank you Ingo . more below .
On Tue, 31 Aug 1999, Ingo Molnar wrote:
> On Mon, 30 Aug 1999, Lawrence Dickson wrote:
>
> > I guess this has been asked before, but - when will the RAID code get
> > past the 12 disk limit? We'd even be willing to use a variant - our
> > customer wants 18 disk RAID-5 real bad.
>
> yes, this has been requested before. I'm now mainly working on the 2.3/2.4
> merge, it's working but it has unearthed main kernel bugs.
Is there a pre-alpha patch set ???? , Would happily try them
out if wanted . Now that I finally have a tapedrive just for
the raid(experimental) system .
>I have patches
> for up to ~250 disks per array, but these patches are not proven and it's
> a major change in the superblock layout.
Please I'd really like to get past the 12 limit w/o doing the
below . Twys , JimL
> until these 'big RAID' patches are merged, as a workaround i suggest you
> to combine two (or more) RAID5 arrays with RAID0 or LINEAR to form a
> bigger array. Data safety is not compromized with this, system
> administration is a bit more complex. (also you cannot get a better than
> 1:12 parity/data ratio) On the bright side, this setup provides you more
> protection than pure 1:18 RAID5. (eg. if you do it 2x 1:9, then the two
> RAID5 arrays can fail at once, there is a 50% chance that simultaneous
> 2-disk failures will be covered by this.)
> -- mingo
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| James W. Laferriere | System Techniques | Give me VMS |
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