Re: [CentOS] xfs not getting it right?

Once upon a time, hw hw@gc-24.de said:

xfs is supposed to detect the layout of a md-RAID devices when creating the file system, but it doesn´t seem to do that:

# cat /proc/mdstat Personalities : [raid1] md10 : active raid1 sde[1] sdd[0] 499976512 blocks super 1.2 [2/2] [UU] bitmap: 0/4 pages [0KB], 65536KB chunk

RAID 1 has no "layout" (for RAID, that usually refers to striping in RAID levels 0/5/6), so there's nothing for a filesystem to detect or optimize for.

The chunk size above is for the md-RAID write-intent bitmap; that's not exposed information (for any RAID system that I'm aware of, software or hardware) or something that filesystems can optimize for.