<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Verdana; font-size: 10pt; color: #000000'>Xen + DRBD problem... CentOS 5.2 32-bit with working 20GB shared DRBD partition.<br><br># rpm -qf /etc/xen/scripts/block-drbd<br>drbd82-8.2.6-1.el5.centos<br># drbdadm state r0<br>Primary/Primary<br><br>Works fine referencing it as a phy: device...<br># grep disk domutest<br>disk = [ "phy:/dev/drbd0,xvda,w" ]<br><br># xm create domutest<br>Using config file "./domutest".<br>Started domain domutest<br><br>Not so much using the DRBD supplied Xen block handler...<br># grep disk domutest<br>disk = [ "drbd:r0,xvda,w" ]<br><br># xm create domutest<br>Using config file "./domutest".<br>No handlers could be found for logger "xend"<br>Error: Disk isn't accessible<br><br>Any suggestions?<br>Thanks...<br><br><br>----- "Oliver Welter" <mail@oliwel.de> wrote:
<br>> -----BEGIN PGP SIGNED MESSAGE-----<br>> Hash: SHA1<br>> <br>> Hi All,<br>> <br>> I used drbd 0.7 a while with protocol B which did fine.<br>> <br>> I migrated the servers and due to the comment in the sample config, that<br>> currently C is considered faster than B, I switched to C but now get<br>> extreme iowaits even in really low load situations.<br>> The system is a dual CPU AMD Quad Opteron and system load raises to >15<br>> and I get 80% waits. DRBD runs over a low latency (~0.1ms) Gigabit Link.<br>> <br>> I now wanted to switch the system to protocol B or even A, is there a<br>> way to do so without shutting down the disks? I have a total of 8 drbd<br>> devices on the box.<br>> <br>> TIA<br>> <br>> Oliver<br>> - --<br>> Protect your environment - close windows and adopt a penguin!<br>> PGP-Key: 3B2C 8095 A7DF 8BB5 2CFF 8168 CAB7 B0DD 3985 1721<br>> -----BEGIN PGP SIGNATURE-----<br>> Version: GnuPG v2.0.7 (GNU/Linux)<br>> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org<br>> <br>> iD8DBQFI30r/yrew3TmFFyERAsGLAJ94qlMXjHtmkv+YvxgoNSuYvMg1aQCePOtz<br>> T1zX86tChP+6Kucqfr7QS5k=<br>> =zjKL<br>> -----END PGP SIGNATURE-----<br>> _______________________________________________<br>> drbd-user mailing list<br>> drbd-user@lists.linbit.com<br>> http://lists.linbit.com/mailman/listinfo/drbd-user<br>> </div></body></html>