I would ask the XFS developers about this - why does mkfs.xfs select sector size 512 by default? If a filesystem created with the default 512-byte sector size is activated on a device with 4k sectors, it results in mount failure. Mikulas On Tue, 11 Sep 2018, David Teigland wrote: > Hi Mikulas, > > Am I doing something wrong below or is there a bug somewhere? (I could be > doing something wrong in the lvm activation code, also.) > Thanks > > > [root@null-05 ~]# lvs foo > LV VG Attr LSize > fast foo -wi------- 32.00m > main foo -wi------- 200.00m > > [root@null-05 ~]# lvchange -ay foo/main > > [root@null-05 ~]# mkfs.xfs /dev/foo/main > meta-data=/dev/foo/main isize=512 agcount=4, agsize=12800 blks > = sectsz=512 attr=2, projid32bit=1 > = crc=1 finobt=0, sparse=0 > data = bsize=4096 blocks=51200, imaxpct=25 > = sunit=0 swidth=0 blks > naming =version 2 bsize=4096 ascii-ci=0 ftype=1 > log =internal log bsize=4096 blocks=855, version=2 > = sectsz=512 sunit=0 blks, lazy-count=1 > realtime =none extsz=4096 blocks=0, rtextents=0 > > [root@null-05 ~]# mount /dev/foo/main /mnt > [root@null-05 ~]# cp /root/pattern* /mnt/ > [root@null-05 ~]# umount /mnt > [root@null-05 ~]# lvchange -an foo/main > > [root@null-05 ~]# lvconvert --type writecache --cachepool fast foo/main > Logical volume foo/main now has write cache. > > [root@null-05 ~]# lvs -a foo -o+devices > LV VG Attr LSize Origin Devices > [fast] foo -wi------- 32.00m /dev/pmem0(0) > main foo Cwi------- 200.00m [main_wcorig] main_wcorig(0) > [main_wcorig] foo -wi------- 200.00m /dev/loop0(0) > > [root@null-05 ~]# lvchange -ay foo/main > > [root@null-05 ~]# dmsetup ls > foo-main_wcorig (253:4) > rhel_null--05-home (253:2) > foo-main (253:5) > foo-fast (253:3) > rhel_null--05-swap (253:1) > rhel_null--05-root (253:0) > > [root@null-05 ~]# dmsetup table > foo-main_wcorig: 0 409600 linear 7:0 2048 > rhel_null--05-home: 0 853286912 linear 8:2 16517120 > foo-main: 0 409600 writecache p 253:4 253:3 4096 0 > foo-fast: 0 65536 linear 259:0 2048 > rhel_null--05-swap: 0 16515072 linear 8:2 2048 > rhel_null--05-root: 0 104857600 linear 8:2 869804032 > > [root@null-05 ~]# mount /dev/foo/main /mnt > mount: mount /dev/mapper/foo-main on /mnt failed: Function not implemented > > [root@null-05 ~]# dmesg | tail -1 > [802734.176118] XFS (dm-5): device supports 4096 byte sectors (not 512) > > [root@null-05 ~]# lvchange -an foo/main > > [root@null-05 ~]# lvconvert --splitcache foo/main > Logical volume foo/main write cache has been detached. > > [root@null-05 ~]# lvchange -ay foo/main > > [root@null-05 ~]# mount /dev/foo/main /mnt > > [root@null-05 ~]# diff /mnt/pattern1 /root/pattern1 > > [root@null-05 ~]# lvs foo > LV VG Attr LSize > fast foo -wi------- 32.00m > main foo -wi-ao---- 200.00m >
