Hi Xiao,
I simplified the scenario.
On 06.05.2021 12:57, Xiao Ni wrote:
Hi Oleksandr Shchirskyi
Can this only happen with PPL, imsm and nvme disks? My machine doesn't support
creating raid device with nvme devices.
Could you try to create array with IMSM_NO_PLATFORM=1?
And rotational disks don't have /sys/block/nvme1n1/device/device/remove. What's
the meaning about setting 1
to the remove file?
I tried to create the imsm raid with rotational disks and ppl. Then remove and
add disk to trigger recovery. It works
well.
I verified that drive removal is not crucial here.
The main trick here is to impose the PPL recovery. I did that by following
scenario:
1. Create array (I was able to reproduce it with 1Gb size):
#mdadm -CR imsm -e imsm -n3 /dev/nvme[456]n1
#mdadm -CR vol2 -l5 -n3 /dev/nvme[456]n1 -z 1G -c64 --assume-clean
--consistency-policy=ppl
2. Get mdmon pid:
# ps -ef | grep mdmon
3. Write data to the drive, and kill mdmon after that (this will force
array to stay dirty):
#dd of=/dev/md126 if=/dev/urandom bs=4M oflag=direct; kill -9 {mdmon_pid}
4. Stop Array:
# mdadm -Ss
5. Start Array:
# mdadm -As
Thanks,
Mariusz
