[DRBD-user] drbd ext3fs error

Lars Ellenberg Lars.Ellenberg at linbit.com
Mon May 9 15:41:55 CEST 2005

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

/ 2005-05-09 15:25:27 +0200
\ Alessandro Ferrari:
> Hi Sandra, Lars,
>     I have the same problem too:
> May  6 09:24:49 server kernel: EXT3-fs error (device drbd(43,0)):
> ext3_free_blocks: Freeing blocks in system zones - Block = 152, count = 1
> ext3_check_descriptors: Block bitmap for group 896 not in group (block
> 29261657)!
>     but my configuration is very different!
> I have master machine with 760Gb on RAID 1+0 by 3Ware controller, It's
> LAN-mirrored with drbd version: 0.6.13 (api:64/proto:62) on slave machine
> with 777Gb /dev/md0 on software-RAID 0.

  Culprit and solution outside DRBD, which was innocent here:
  Turning off hardware write cache seems to have solved the problem.

Out of curiosity:
What effect (felt or measured) this hardware cache had on performance?

	Lars Ellenberg

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