mkfs.xfs on hw RAID6

[Gaspar Bakos <gbakos@xxxxxxxxxxxxxxx>]

Hi,

I am trying to create an XFS filesystem on a hardware RAID-6 partition
that consists of 12 x 500Gb disks, i.e. the total disk space is 5Tb. All
this is one big partition, created by parted. Typical filesize will
range from 100Kb to 30Mb, but very small files are not typical.

I wonder about the usual magic; with a raid setup the su,sw and log su,size
parameters can be optimized.

The RAID stripe size is 64K in my case.

In other words:

mkfs.xfs -b size=$BS -d su=$SU,sw=$SW -i size=$ISIZE -l su=$LSU,size=$LS -L BIG 
/dev/sdc1
BS=?
SU=?
SW=?
ISIZE=?
LSU=?
LS=?

I would say:

mkfs.xfs -b size=4k -d su=64k,sw=10 -f -i size=512 -l su=64k,size=32m -L BIG 
/dev/sdc1

I read somewhere some time ago that
recommended sw = (num_of_disks - 1) with RAID-5 .
The current sw = 10 is intuitive for RAID-6.

I can also imagine that with hardware RAID all this is not that important.

Thanks in advance for suggestions!

Cheers,
Gaspar