I would like to ask something regarding XFS and RAID 5:
I've built raid 5 from 4 1TB devices using 256KB chunk size.
I wanted to tweak XFS on it a little so I formatted it with
mkfs.xfs -f -L DATA -l internal,size=128m -d agcount=30,su=256k,sw=3 /dev/md0
Problem is that output shows:
eta-data=/dev/md0 isize=256 agcount=30, agsize=24419072 blks
= sectsz=4096 attr=2
data = bsize=4096 blocks=732571776, imaxpct=5
= sunit=64 swidth=192 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=32768, version=2
= sectsz=4096 sunit=1 blks, lazy-count=0
realtime =none extsz=786432 blocks=0, rtextents=0
That's not exactly sunit that I wanted (should be 512 and swidth 1536).
Even if I try to mount it with these options set to proper numbers, xfs_info still provides same output.
Any ideas or suggestions why this happens?