I created a 60TB thick volume and I took a snapshot on it with e2fsck.
And it shows a message that I don't understand.
> e2fsck -dnvftt /dev/mapper/vg1-snap10001
e2fsck 1.43.9 (8-Feb-2018)
Pass 1: Checking inodes, blocks, and sizes
Inode 81855343 has INDEX_FL flag set on filesystem without htree support.
Pass 1: Memory used: 40608k/37792k (7837k/32772k), time: 165.37/150.20/ 1.90
Pass 1: I/O read: 1085MB, write: 0MB, rate: 6.56MB/s
Pass 2: Checking directory structure
Pass 2: Memory used: 40608k/36608k (8325k/32284k), time: 6.40/ 3.16/ 0.21
Pass 2: I/O read: 125MB, write: 0MB, rate: 19.52MB/s
Pass 3: Checking directory connectivity
Peak memory: Memory used: 40608k/36608k (8325k/32284k), time: 217.58/172.47/ 2.24
Pass 3: Memory used: 40608k/36608k (8324k/32285k), time: 0.31/ 0.30/ 0.00
Pass 3: I/O read: 0MB, write: 0MB, rate: 0.00MB/s
Pass 4: Checking reference counts
Pass 4: Memory used: 40608k/36608k (4565k/36044k), time: 114.33/45.76/12.61
Pass 4: I/O read: 0MB, write: 0MB, rate: 0.00MB/s
Pass 5: Checking group summary information
Free inodes count wrong (1006078544, counted=1006078554).
Pass 5: Memory used: 40608k/36608k (2324k/38285k), time: 288.05/15.74/ 4.96
Pass 5: I/O read: 1922MB, write: 0MB, rate: 6.67MB/s
Memory used: 40608k/36608k (2324k/38285k), time: 620.30/234.25/19.81
I/O read: 3161MB, write: 0MB, rate: 5.10MB/s
Error writing block 1 (Bad file descriptor). Ignore error? no
Error writing block 2 (Bad file descriptor). Ignore error? no
Error writing block 3 (Bad file descriptor). Ignore error? no
Error writing block 4 (Bad file descriptor). Ignore error? no
...
Error writing block 3219095552 (Bad file descriptor). Ignore error? no
Error writing block 3219128320 (Bad file descriptor). Ignore error? no
Error writing block 3219161088 (Bad file descriptor). Ignore error? no
Error writing block 3221192704 (Bad file descriptor). Ignore error? no
Why it doesn't show what causes the problem?
=== Update ===
I tried with setup /etc/e2fsck.conf to let the e2fsck store some files in another directory.
[/dst0] # cat /etc/e2fsck.conf
[scratch_files]
directory = "/dst/fsck_dir"
[options]
log_dir = /dst/e2fscklog/
log_filename = e2fsck-%N.%h.INFO.%D-%T
[/dst0] # df /dst/
Filesystem Size Used Available Use% Mounted on
/dev/mapper/cachedev2 5.0T 132.5M 5.0T 0% /dst
[/dst0] # ls /dst/fsck_dir/
e0888329-80d9-46dc-81cb-8472e34e2fdb-icount-8g98jg
...
It stores some files there, but still doesn't work.
