Nibmle storage MODEL AF40 (swidth sunit xfs)

[Ares7]

Hello. I want to tune swidth and sunit parameters for xfs.  By default it is zero on Oracle Linux 7

xfs_info /db/oradata-new/
meta-data=/dev/mapper/nimble-work-oradata isize=256    agcount=4, agsize=201326592 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=805306368, imaxpct=5
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=393216, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

From xfs site:

su = <RAID controllers stripe size in BYTES (or KiBytes when used with k)>
 sw = <# of data disks (don't count parity disks)>

So if your RAID controller has a stripe size of 64KB, and you have a RAID-6 with 8 disks, use

 su = 64k
 sw = 6 (RAID-6 of 8 disks has 6 data disks)

A RAID stripe size of 256KB with a RAID-10 over 16 disks should use

 su = 256k
 sw = 8 (RAID-10 of 16 disks has 8 data disks)