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Block bitmap differences



Hi,

a few weeks ago, an unhealthy combination of firmware in an Adaptec Raid controller and Seagate disks damaged my Raid6 filesystem. A bunch of files were damaged or lost at that time after the firmaware was updated and I had run e2fsck. Luckily, I was able to restore everything from a backup. A subsequent check with e2fsck reported no errors.

Yesterday, I ran e2fsck -n again, to see if the system is still OK. It isn't and I have no idea how to interpret the messages (see attachment).

What is the meaning and severity of

- Block bitmap differences?
- Free blocks count wrong for group?


Thanks and regards.

Roland


receiving file list ... done
data/886125/

sent 26 bytes  received 166603904 bytes  63820.70 bytes/sec
total size is 1156104247261  speedup is 6939.24
e2fsck 1.40.8 (13-Mar-2008)
Warning!  /dev/sdb1 is mounted.
Warning: skipping journal recovery because doing a read-only filesystem check.
/dev/sdb1 contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences:  -(729567354--729567775) -(729630796--729630799) -(729632768--729633174) -(1875509507--1875509511) +(1875775082--1875775086)
Fix? no

Free blocks count wrong for group #22260 (969, counted=0).
Fix? no

Free blocks count wrong for group #22264 (544, counted=0).
Fix? no

Free blocks count wrong for group #22266 (2794, counted=2383).
Fix? no

Free blocks count wrong for group #57236 (5, counted=0).
Fix? no

Free blocks count wrong for group #57244 (14, counted=19).
Fix? no

Free blocks count wrong (1316741037, counted=1316739108).
Fix? no

Inode bitmap differences:  +468729888 -468730043
Fix? no


/dev/sdb1: ********** WARNING: Filesystem still has errors **********

/dev/sdb1: 32026820/536870912 files (0.5% non-contiguous), 830719896/2147460933 blocks

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