[CentOS] xfs not getting it right?
hw
hw at gc-24.de
Wed Sep 20 15:52:03 UTC 2017
Stephen John Smoogen wrote:
> On 20 September 2017 at 10:47, hw <hw at gc-24.de> 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
I was expecting that the correct stripe size and stripe width would be used.
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