[DRBD-user] md5 sums mismatch

Łukasz Oleś lukaszoles at gmail.com
Mon Jul 11 10:32:32 CEST 2011

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

W dniu 10 lipca 2011 22:09 użytkownik Łukasz Oleś
<lukaszoles at gmail.com> napisał:
> Hi,
> I configured drbd on two 3,5TB disks. Then I created iscsi target on
> it. On initiator side I created LVM on it. Then I created 6k files
> 500MB each.
> All time drbd was connected and in UpToDate state. Then I switched
> nodes. Destination become source, I checked md5 sums and on two files
> I got diffrent results.
> I'm using kernel 2.6.27 and drbd 8.3.10 on Debian based distribution.
> I tried to run verify but few seconds after start it hanged. So I
> updated drbd to version 8.3.11 and now verify is running ok, but it
> will take 16h.
> Any idea why did it happen and how to prevent it in the future?

Here is drbdadm verify result:
block drbd1: Starting Online Verify from sector 0
[35897.938685] block drbd1: Out of sync: start=4222499840, size=128 (sectors)
[55680.388075] block drbd1: Out of sync: start=6608443968, size=64 (sectors)
[61738.210494] block drbd1: Out of sync: start=7340031488, size=512 (sectors)
[61738.211438] block drbd1: Online verify  done (total 60837 sec;
paused 0 sec; 60324 K/sec)
[61738.211441] block drbd1: Online verify found 88 4k block out of sync!
[61738.211447] block drbd1: conn( VerifyS -> Connected )
[61738.211452] block drbd1: helper command: /sbin/drbdadm out-of-sync minor-1
[61738.214964] block drbd1: helper command: /sbin/drbdadm out-of-sync
minor-1 exit code 0 (0x0)
[61738.215694] block drbd1: bitmap WRITE of 3 pages took 0 jiffies
[61738.215697] block drbd1: 352 KB (88 bits) marked out-of-sync by on
disk bit-map

Any idea what happened? Do you need any additional information?

Łukasz Oleś

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