On 10-11-16 23:17, Luca Berra wrote:
On Tue, Nov 16, 2010 at 08:08:44PM +0200, Zoltan Szecsei wrote:
*** Commands used:
mdadm --create /dev/md0 --metadata=1.2 --auto=md --assume-clean
--bitmap=internal --bitmap-chunk=131072 --chunk=512 --level=6
--raid-devices=8 /dev/sd[abcdefgh]
mdadm --detail --scan >> /etc/mdadm.conf
mdadm --assemble /dev/md0
as i said this is not useful
pvcreate --metadatasize 512 /dev/md0
you should use --dataalignment, not --metadatasize, also you should
Also with reference to metadatasize - keep in mind the value is rounded
up to the /next/ 64k boundary (or it was a while ago, perhaps it's
changed now). So in your case, 512 would really result with 576.
With reference to --dataalignment - there's also --dataalignoffset
option (although not really important in your setup).
You might consider adjusting
/sys/block/<yourmddevice>/md/stripe_cache_size to higher values when you
have everything set. It tends to give quite a performance boost.
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