I have a 100G JFS filesystem running inside LVM on a hardware
RAID5 volume. The space is being used for a postgres database which is
using about 43GB. The backup process (which writes to a separate volume)
used to run in a mere hour or two, but is now running for 16 hours or
more, even though the DB has not increased much in size and the DB
"load" stays constant. The only reason I'm thinking about JFS being
involved in the slowdown is that a read-only fsck is showing some errors
that look like:
**Phase 7 - Verify File/Directory Allocation Maps
Errors detected in the Fileset File/Directory Allocation Map control
information. (F)
Errors detected in the Fileset File/Directory Allocation Map. (F)
**Phase 8 - Verify Disk Allocation Maps
Incorrect data detected in disk allocation structures.
Incorrect data detected in disk allocation control structures.
Specificially:
Inode Allocation Group F99 is inconsistent.
The Inode Allocation Map has an incorrect number of backed inodes value
(F).
The Inode Allocation Map has an incorrect number of free inodes value
(F).
The Inode Allocation Map control information has an incorrect number of
free inodes value for AG F6.
The Inode Allocation Map control information has an incorrect number of
backed inodes value for AG F16.
The Inode Allocation Map control information has an incorrect number of
free inodes value for AG F16.
...
Incorrect number free detected in dmap 2659.
Incorrect internal (0) value detected in DM page 2659.
Incorrect internal (1) value detected in DM page 2659.
Incorrect internal (2) value detected in DM page 2659.
Incorrect internal (4) value detected in DM page 2659.
...
Inconsistencies detected in leaf values (DM).
Inconsistencies detected in internal values (DM).
Incorrect data detected in pages (DM).
Inconsistencies detected in leaf values (L0).
Discrepancies detected in the Block Map Control Page AG free count list.
Incorrect data detected in the Block Map Control Page.
Incorrect data detected in disk allocation structures.
Incorrect data detected in disk allocation control structures.
Could this cause performance problems? Could this be some kind
of JFS fragmentation problem? BTW, I've noticed that filesystems
sometimes become corrupted after doing an online resize...
Fedora Core release 6 (Zod)
2.6.18-1.2798.fc6
jfsutils-1.1.10-4.1
Thanks,
-poul
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