[lustre-discuss] Pools disappeared after upgrade to Lustre 2.15.5

[Pavlo Khmel]

Hi,

I upgraded Luster from 2.12.8 to 2.15.5 (server and clients). After
upgrade, I found that all Lustre pools disappeared. There were 2 pools:
- cluster.ssh
- cluster.hdd

[root at mds1 ~]# lctl pool_list cluster
Pools from cluster:

[root at mds1 ~]# lctl pool_list cluster.ssd
Pool: cluster.ssd
lctl pool_list: cannot open
/proc/fs/lustre/lov/cluster-MDT0000-mdtlov/pools/ssd: No such file or
directory (2)

[root at mds1 ~]# ls -la /proc/fs/lustre/lov/cluster-MDT0000-mdtlov/pools/
total 0
dr-xr-xr-x 2 root root 0 Aug  1 10:49 .
dr-xr-xr-x 4 root root 0 Aug  1 10:49 ..

On the client side "lfs getstripe" still shows pool names.

[root at login2 ~]# lfs getstripe /cluster
. . .
/cluster/home
stripe_count:  1 stripe_size:   1048576 pattern:       raid0 stripe_offset:
-1 pool:          hdd
/cluster/apps
stripe_count:  1 stripe_size:   1048576 pattern:       raid0 stripe_offset:
-1 pool:          ssd

I created pools again:

[root at mds1 ~]# lctl pool_new cluster.ssd
Pool cluster.ssd created

[root at mds1 ~]# lctl pool_add cluster.ssd OST[0-3]
Warning, OST cluster-OST0000_UUID not found in pool cluster.ssd
OST cluster-OST0001_UUID added to pool cluster.ssd
. . .

Adding OSTs to the pool shows a warings message "OST ... not found in pool
..." sometimes.

Question 1: Is it expected behavior that pools disappeared after the Luster
upgrade?
Question 2: Is it safe to ignore warning messages "OST ... not found in
pool ..." when adding OST to the pool.

Best regards,
Pavlo Khmel
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