I'd appreciate advise on how to align properly XFS file system with
LVM2-striped set of six RAID5 devices.
Given:
6 mdadm RAIDs like this:
md16 : active raid5 sdaw1[6] sdav1[5] sdau1[4] sdat1[3] sdas1[2]
sdar1[1] sdaq1[0]
2930303616 blocks level 5, 64k chunk, algorithm 2 [7/7] [UUUUUUU]
-----------------------------
42 spindles in all.
Then I'd like to build one huge VG out of them:
vgcreate md /dev/md1[123456]
Then create the only logical volume:
lvcreate -i 6 -I <some_stripe_size> -l 100%FREE -n tsm md
And finally lay out an XFS file system on this big LV (mkfs.xfs -f /dev/md/tsm)
This is for a backup server that should/will push respectable amounts of IO.
The idea is to achieve maximum possible throughput by utilizing
parallel reads/writes to a lot of spindles.
What parameters and how I should take into consideration?
--
Warm regards,
Michael Green
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