2.2.3. Exercise 3

Make an XFS filesystem that is aligned on stripe width/unit boundaries:

use a stripe unit size of 128KB (Note: when using the sunit option the value is in 512 byte blocks)
use a stripe width size of 2MB (Note: when using the swidth option the value is in 512 byte blocks and is a multiple of the sunit value)

Create the stripe aligned filesystem.

# mkfs -t xfs -f -d sunit=256,swidth=2048 /dev/sda4
meta-data=/dev/sda4              isize=256    agcount=16, agsize=461632 blks
         =                       sectsz=512   attr=0
data     =                       bsize=4096   blocks=7385872, imaxpct=25
         =                       sunit=32     swidth=256 blks, unwritten=1
naming   =version 2              bsize=4096
log      =internal log           bsize=4096   blocks=3616, version=1
         =                       sectsz=512   sunit=0 blks
realtime =none                   extsz=65536  blocks=0, rtextents=0

The sunit and swidth values displayed by mkfs are in filesystem blocks (ie 32 * 4KB = 128KB)