[lustre-discuss] Cannot mount MDT after upgrading from Lustre 2.12.6 to 2.15.3

[Tung-Han Hsieh]

Dear All,

Today we tried to upgrade Lustre file system from version 2.12.6 to 2.15.3.
But after the work, we cannot mount MDT successfully. Our MDT is ldiskfs
backend. The procedure of upgrade is

1. Install the new version of e2fsprogs-1.47.0
2. Install Lustre-2.15.3
3. After reboot, run: tunefs.lustre --writeconf /dev/md0

Then when mounting MDT, we got the error message in dmesg:

===========================================================
[11662.434724] LDISKFS-fs (md0): mounted filesystem with ordered data mode.
Opts: user_xattr,errors=remount-ro,no_mbcache,nodelalloc
[11662.584593] Lustre: 3440:0:(scrub.c:189:scrub_file_load())
chome-MDT0000: reset scrub OI count for format change (LU-16655)
[11666.036253] Lustre: MGS: Logs for fs chome were removed by user
request.  All servers must be restarted in order to regenerate the logs: rc
= 0
[11666.523144] Lustre: chome-MDT0000: Imperative Recovery not enabled,
recovery window 300-900
[11666.594098] LustreError: 3440:0:(mdd_device.c:1355:mdd_prepare())
chome-MDD0000: get default LMV of root failed: rc = -2
[11666.594291] LustreError:
3440:0:(obd_mount_server.c:2027:server_fill_super()) Unable to start
targets: -2
[11666.594951] Lustre: Failing over chome-MDT0000
[11672.868438] Lustre: 3440:0:(client.c:2295:ptlrpc_expire_one_request())
@@@ Request sent has timed out for slow reply: [sent 1695492248/real
1695492248]  req at 000000005dfd9b53 x1777852464760768/t0(0)
o251->MGC192.168.32.240 at o2ib@0 at lo:26/25 lens 224/224 e 0 to 1 dl 1695492254
ref 2 fl Rpc:XNQr/0/ffffffff rc 0/-1 job:''
[11672.925905] Lustre: server umount chome-MDT0000 complete
[11672.926036] LustreError: 3440:0:(super25.c:183:lustre_fill_super())
llite: Unable to mount <unknown>: rc = -2
[11872.893970] LDISKFS-fs (md0): mounted filesystem with ordered data mode.
Opts: (null)
============================================================

Could anyone help to solve this problem ? Sorry that it is really urgent.

Thank you very much.

T.H.Hsieh
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