On 6/12/20 5:00 AM, allenpeng wrote: > If we start reshaping on md which shares sub-devices with another > resyncing md, it may be forced to wait for others to complete. mdadm > occupies the md's fd during this time, which causes the md can not be > stopped and the filesystem can not be mounted on the md. We can close > md's fd earlier to solve this problem. > > Reproducible Steps: > > 1. create two partitions on sda, sdb, sdc, sdd > 2. create raid1 with sda1, sdb1 > mdadm -C /dev/md1 --assume-clean -l1 -n2 /dev/sda1 /dev/sdb1 > 3. create raid5 with sda2, sdb2, sdc2 > mdadm -C /dev/md2 --assume-clean -l5 -n3 /dev/sda2 /dev/sdb2 /dev/sdc2 > 4. start resync at md1 > echo repair > /sys/block/md1/md/sync_action > 5. reshape raid5 to raid6 > mdadm -a /dev/md2 /dev/sdd2 > mdadm --grow /dev/md2 -n4 -l6 --backup-file=/root/md2-backup > > Now mdadm is occupying the fd of md2, causing md2 unable to be stopped > > 6.Try to stop md2, an error message shows > mdadm -S /dev/md2 > mdadm: Cannot get exclusive access to /dev/md3:Perhaps a running process, > mounted filesystem or active volume group? > > Reviewed-by: Alex Wu <alexwu@xxxxxxxxxxxx> > Reviewed-by: BingJing Chang <bingjingc@xxxxxxxxxxxx> > Reviewed-by: Danny Shih <dannyshih@xxxxxxxxxxxx> > Signed-off-by: ChangSyun Peng <allenpeng@xxxxxxxxxxxx> Applied! Thanks, Jes
