Am Freitag, 5. Dezember 2008 15:00 schrieb Tobias Appel: > Hi, > > I remember the survey on the mailinglist not long ago but I don't really > remember the results. > Is DRBD 8 currently working with Heartbeat 2.14.x ? > I got the book from Dr. Schwartzkopff in which he explains an example > with DRBD 0.7 and I tried to use this example with DRBD 8 but it fails > for (yet) unknown reasons.
As far as I I interprete the results on my posting there are two problems with DRBD8 in heartbeat: - Latency problem in cluster filesystems (esp. OCFS2) that HB cannot deal with correctly. OCFS has a separate fencing mechanism that dos not go together well with HA RA. - HA RA allows only 1 (in words one) master of a DRBD resource. This is hard coded. From this I concluded that it makes no sense to use DRBD8 with a cluster filesystem in heartbeat cluster. But DRBD8 has the advantage of the dopd service. So my latest setup is: DRBD8, DRBD RA and normal ext3 filesystem. I have two DRBDs in my setup and use one on each node for load sharing reasons. > I got DRBD 8 to work with Heartbeat V1 just easily. The only difference > is that I had the DRBD service started on both nodes automatically at > startup and Heartbeat just mounted the filesystem and made the active > node primary. I used drbddisk and the Filesystem script on this > environment. > > Now for Heartbeat V2 I created a Master/Slave Resource for the drbd > service then a primitive for the Filesystem within my resource group and > an order and colocation constraint, just like in the book. But right now > it fails to start and I can't my resource group anymore. Fix it manually. drbdadmin and cat /proc/drbd is your friend. It should really work. DO NOT start DRBD from init, but only from heartbeat. Bringing DRBD with the RA to life is a little bit tricky but works afterwards like a charm. Also use the "cleanup button" or crm_resource -C -r<resource_drbd> -U <node> often! Beware with open files on a drbd device, that you opened manually. This prohibits unmounting and gives the cluster a headache. > So if there are known problems with the OCF Agent and DRBD 8 please let > me know. I don't know yet how to 'downgrade' to DRBD 0.7 because I used > yum to install it on RHEL5 but I guess I will have to manually compile > it then (unless there is a way to tell yum to install version 0.7 > somehow). My advise: Use DRBD8 since this is packaged in the most distros now, but do not use a cluster FS now. Any other experiences? Michael. -- Dr. Michael Schwartzkopff MultiNET Services GmbH Addresse: Bretonischer Ring 7; 85630 Grasbrunn; Germany Tel: +49 - 89 - 45 69 11 0 Fax: +49 - 89 - 45 69 11 21 mob: +49 - 174 - 343 28 75 mail: [EMAIL PROTECTED] web: www.multinet.de Sitz der Gesellschaft: 85630 Grasbrunn Registergericht: Amtsgericht München HRB 114375 Geschäftsführer: Günter Jurgeneit, Hubert Martens --- PGP Fingerprint: F919 3919 FF12 ED5A 2801 DEA6 AA77 57A4 EDD8 979B Skype: misch42 _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
