[DRBD-user] transmission protocol / change without shutting down the disks

Wendell Dingus wendell at bisonline.com
Sun Sep 28 14:20:03 CEST 2008

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

Xen + DRBD problem... CentOS 5.2 32-bit with working 20GB shared DRBD partition. 

# rpm -qf /etc/xen/scripts/block-drbd 
# drbdadm state r0 

Works fine referencing it as a phy: device... 
# grep disk domutest 
disk = [ "phy:/dev/drbd0,xvda,w" ] 

# xm create domutest 
Using config file "./domutest". 
Started domain domutest 

Not so much using the DRBD supplied Xen block handler... 
# grep disk domutest 
disk = [ "drbd:r0,xvda,w" ] 

# xm create domutest 
Using config file "./domutest". 
No handlers could be found for logger "xend" 
Error: Disk isn't accessible 

Any suggestions? 

----- "Oliver Welter" <mail at oliwel.de> wrote: 
> Hash: SHA1 
> Hi All, 
> I used drbd 0.7 a while with protocol B which did fine. 
> I migrated the servers and due to the comment in the sample config, that 
> currently C is considered faster than B, I switched to C but now get 
> extreme iowaits even in really low load situations. 
> The system is a dual CPU AMD Quad Opteron and system load raises to >15 
> and I get 80% waits. DRBD runs over a low latency (~0.1ms) Gigabit Link. 
> I now wanted to switch the system to protocol B or even A, is there a 
> way to do so without shutting down the disks? I have a total of 8 drbd 
> devices on the box. 
> TIA 
> Oliver 
> - -- 
> Protect your environment - close windows and adopt a penguin! 
> PGP-Key: 3B2C 8095 A7DF 8BB5 2CFF 8168 CAB7 B0DD 3985 1721 
> Version: GnuPG v2.0.7 (GNU/Linux) 
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org 
> iD8DBQFI30r/yrew3TmFFyERAsGLAJ94qlMXjHtmkv+YvxgoNSuYvMg1aQCePOtz 
> T1zX86tChP+6Kucqfr7QS5k= 
> =zjKL 
> -----END PGP SIGNATURE----- 
> _______________________________________________ 
> drbd-user mailing list 
> drbd-user at lists.linbit.com 
> http://lists.linbit.com/mailman/listinfo/drbd-user 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20080928/69869783/attachment.htm>

More information about the drbd-user mailing list