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xfs hardware RAID alignment over linear lvm

To: xfs@xxxxxxxxxxx
Subject: xfs hardware RAID alignment over linear lvm
From: Stewart Webb <stew@xxxxxxxxxxxxxxxxxx>
Date: Wed, 25 Sep 2013 13:56:13 +0100
Delivered-to: xfs@xxxxxxxxxxx
Hi All,

I am trying to do the following:
3 x Hardware RAID Cards each with a raid 6 volume of 12 disks presented to the OS
all raid units have a "stripe size" of 512 KB

so given the info on the xfs.org wiki - I sould give each filesystem a sunit of 512 KB and a swidth of 10 (because RAID 6 has 2 parity disks)

all well and good

But - I would like to use Linear LVM to bring all 3 cards into 1 logical volume -
here is where my question crops up:
Does this effect how I need to align the filesystem?


Stewart Webb
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