[DRBD-user] kernel: drbd0: bio would need to, but cannot, be split:

hans morbus2000 morbus2000 at web.de
Thu May 28 13:01:04 CEST 2009

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


hello,

we have configure "Nested lvm2 on top of drbd" on SLES10 SP2 (with all Updates)
Raid5 ->lvm2->drbd->lvm2 with 3 LVs with reiserfs and ocfs2
drbd 8.2.6 in primary/primary mode

when we mapping LV to Virtual Disk over GUI or command line
# xm block-attach <domain id from xm list> /dev/vgmirror/raid dev/xvdb w

Everything was going just fine until I tried to test the filesystems in the domU

error on DomU
kernel: Buffer I/O error on device xvdb1, logical block 838849799
kernel: end_request: I/O error, dev xvdb, sector 838849855
kernel: Buffer I/O error on device xvdb1, logical block 838849792
kernel: Buffer I/O error on device xvdb1, logical block 838849793
kernel: end_request: I/O error, dev xvdb, sector 63
kernel: end_request: I/O error, dev xvdb, sector 63
kernel: end_request: I/O error, dev xvdb, sector 125
...

error on Dom0
kernel: drbd0: bio would need to, but cannot, be split: (vcnt=8,idx=0,size=4096,sector=1048565439)
kernel: drbd0: bio would need to, but cannot, be split: (vcnt=8,idx=0,size=4096,sector=1048565439)
kernel: drbd0: bio would need to, but cannot, be split: (vcnt=8,idx=0,size=4096,sector=209715647)
kernel: drbd0: bio would need to, but cannot, be split: (vcnt=8,idx=0,size=4096,sector=209715647)
...

how can we resolve this problem?
is this solved in the release 8.3?
can DRBD handle more than one Logical Volume per DRBD device?

regards
Andy




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