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makefs alignment issue

To: xfs@xxxxxxxxxxx
Subject: makefs alignment issue
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Fri, 24 Oct 2014 15:11:53 -0500
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.7.0
Just remade a couple of filesystems and received an alignment msg I
don't recall receiving previously:

# mkfs.xfs -f -d su=64k,sw=12 /dev/s2d_a1l003
mkfs.xfs: Specified data stripe width 1536 is not the same as the volume
stripe width 2048
meta-data=/dev/s2d_a1l003        isize=256    agcount=44,
agsize=268435440 blks
         =                       sectsz=512   attr=2, projid32bit=0
data     =                       bsize=4096   blocks=11709285376, imaxpct=5
         =                       sunit=16     swidth=192 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal log           bsize=4096   blocks=521728, version=2
         =                       sectsz=512   sunit=16 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

/dev/s2d_a1l003 is an alias to dm-0 which is a dm-multipath device to a
LUN on hardware RAID.  The hardware geometry is 64kx 12, 768k.  AFAIK no
geometry information has been specified for these device mapper devices
(someone else's responsibility).  Though I assume dm geometry data is
the reason for mkfs.xfs throwing this alert.  I don't find anything in
/sys/devices/virtual/block/dm-0/ indicating geometry.

Any ideas how to verify what's going on here and fix it?


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