On 20 September 2017 at 10:47, hw <hw@xxxxxxxx> wrote:
>
> Hi,
>
> 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
>
>
> # mkfs.xfs /dev/md10p2
> meta-data=/dev/md10p2 isize=512 agcount=4, agsize=30199892
> blks
> = sectsz=512 attr=2, projid32bit=1
> = crc=1 finobt=0, sparse=0
> data = bsize=4096 blocks=120799568, imaxpct=25
> = sunit=0 swidth=0 blks
> naming =version 2 bsize=4096 ascii-ci=0 ftype=1
> log =internal log bsize=4096 blocks=58984, version=2
> = sectsz=512 sunit=0 blks, lazy-count=1
> realtime =none extsz=4096 blocks=0, rtextents=0
>
>
> # mkfs.xfs -f -d su=64m,sw=2 /dev/md10p2
> meta-data=/dev/md10p2 isize=512 agcount=16, agsize=7553024
> blks
> = sectsz=512 attr=2, projid32bit=1
> = crc=1 finobt=0, sparse=0
> data = bsize=4096 blocks=120799568, imaxpct=25
> = sunit=16384 swidth=32768 blks
> naming =version 2 bsize=4096 ascii-ci=0 ftype=1
> log =internal log bsize=4096 blocks=58984, version=2
> = sectsz=512 sunit=8 blks, lazy-count=1
> realtime =none extsz=4096 blocks=0, rtextents=0
>
>
> The 64MB chunk size was picked my mdadm automatically. The device is made
> from two disks, and xfs either doesn´t figure that out, or it decided to
> ignore the layout of the underlying RAID.
>
> Am I doing something wrong here, or is xfs in Centos somehow different?
> Do, or must, we always specify the apporpriate values for su and sw or
> did xfs ignore them because what it picked is better?
>
I don't know enough to answer, but I do have a question.. what were
you expecting xfs to do (and what filesystems do that?) Thanks
--
Stephen J Smoogen.
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