[DRBD-user] Concurrent local write detected

Thilo Uttendorfer t.uttendorfer at linux-ag.com
Fri Jun 22 18:53:18 CEST 2012

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


Hi,

we have a KVM cluster with each virtual machine running on top of a DRBD 
device. After running this setup for many month we recently saw these log 
messages on two (of total 15) DRBD devices:

Jun 22 17:53:01 server-v1 kernel: [4995041.347749] block drbd13: 
qemu-system-x86[9395] Concurrent local write detected! [DISCARD L] new: 
53981575s +28672; pending: 53981575s +20480

Looking at older posts on this topic [1], we are worried that we have serious 
data corruption. Does this indicate that qemu-system-x86 (kvm) has a bug in 
some (probably rare) conditions?

Kernel 2.6.35
DRBD: 8.3.8


Thanks for any help,
Thilo



[1] 
http://old.nabble.com/IET-1.4.20.2-hosting-vmfs-on-drbd-complains-about-concurrent-write-td29756710.html


-- 
Thilo Uttendorfer
Linux Information Systems AG
Putzbrunner Str. 71, 81739 München

Fon: +49 89 993412-11, Fax: +49 89 993412-99
t.uttendorfer at linux-ag.com, http://www.linux-ag.com



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