[LU-4923] lfsck statistics are inconsistent

Tue, 11 Sep 2018 23:32:17 +0000

An existing filesystem on a 2.4.2 MDT that was previously upgraded from Lustre 2.1, 1.8, 1.6, has about 1.8M inodes in use:

lfs df -i
UUID                      Inodes       IUsed       IFree IUse% Mounted on
myth-MDT0000_UUID        2621440     1837764      783676  70% /myth[MDT:0]
myth-OST0000_UUID         921856      315326      606530  34% /myth[OST:0]
myth-OST0001_UUID         475168      168933      306235  36% /myth[OST:1]
myth-OST0002_UUID         715264      585400      129864  82% /myth[OST:2]
myth-OST0003_UUID         688128      600027       88101  87% /myth[OST:3]
myth-OST0004_UUID         921856      118677      803179  13% /myth[OST:4]

filesystem summary:      2621440     1837764      783676  70% /myth

Running "lctl lfsck_start -t namespace -M myth-MDT0000" it shows the following statistics on completion:

lctl get_param mdd.*.lfsck_namespace
mdd.myth-MDT0000.lfsck_namespace=
name: lfsck_namespace
magic: 0xa0629d03
version: 2
status: completed
flags: scanned-once,inconsistent
param: (null)
time_since_last_completed: 3 seconds
time_since_latest_start: 126 seconds
time_since_last_checkpoint: 3 seconds
latest_start_position: 13, N/A, N/A
last_checkpoint_position: 2621440, N/A, N/A
first_failure_position: N/A, N/A, N/A
checked_phase1: 3688305
checked_phase2: 222
updated_phase1: 1762893
updated_phase2: 147
failed_phase1: 0
failed_phase2: 0
dirs: 92332
M-linked: 833
nlinks_repaired: 0
lost_found: 0
success_count: 3
run_time_phase1: 122 seconds
run_time_phase2: 0 seconds
average_speed_phase1: 30232 items/sec
average_speed_phase2: 222 objs/sec
real-time_speed_phase1: N/A
real-time_speed_phase2: N/A
current_position: N/A

The number of inodes reported "checked_phase1" is about 2x the number of actual inodes in the filesystem, which looks like a bug if LFSCK is checking each inode twice.

Also, the "updated_phase1" value is always showing almost all of the inodes are "updated", even if LFSCK is run multiple times. This seems like a possibly separate bug if this is caused by IGIF inodes, or other problems with older filesystems.

Whamcloud Community JIRA

[LU-4923] lfsck statistics are inconsistent