Ceph » CephFS

Check the headers in dump file after journal recovery. Otherwise, importing a file with Invalid Header, would lead to 'Journal not readable'.

$  ./bin/cephfs-journal-tool --rank a:0 journal export ./file1 
journal is 4194304~940
wrote 940 bytes at offset 4194304 to ./file1
NOTE: this is a _sparse_ file; you can
    $ tar cSzf ./file1.tgz ./file1
      to efficiently compress it while preserving sparseness.

# Edit file1 to have an invalid header.

$ ./bin/cephfs-journal-tool --rank a:0  journal import file1
undump file1
start 4194304 len 940 write_pos 4194304 format 1 trimmed_pos 4194304 stripe_unit 4194304 stripe_count 1 object_size 4194304
writing header 200.00000000
Purging 2 objects from 1
 writing 4194304~940
2024-11-14T10:49:58.964+0530 7f13452c9300 -1 Failed to write header: (22) Invalid argument
Error ((22) Invalid argument)

$ rm file1

$  ./bin/cephfs-journal-tool --rank a:0 journal export ./file1 
2024-11-14T10:50:42.591+0530 7f9e60adf300 -1 Missing object 200.00000001
Error ((5) Input/output error)
2024-11-14T10:50:42.592+0530 7f9e60adf300 -1 journal_export: Journal not readable, attempt object-by-object dump with `rados`

$  ./bin/cephfs-journal-tool --rank a:0 journal export ./file1 
2024-11-14T10:50:42.591+0530 7f9e60adf300 -1 Missing object 200.00000001
Error ((5) Input/output error)
2024-11-14T10:50:42.592+0530 7f9e60adf300 -1 journal_export: Journal not readable, attempt object-by-object dump with `rados`