Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Fri, Jul 25, 2008 at 11:49:33AM +0200, Heiko wrote: > On Fri, Jul 25, 2008 at 11:07 AM, Robert Verspuy <robert at exa-omicron.nl> wrote: > > Michael schreef: > >> > >> Why not to use loop? > >> assing xen image to loop1 ( drbd1 ( > >> loop2 to drbd2 ... etc... > >> > Hello, > > do you mean that I create a Xen Image, than do a "losetup /dev/loop1 > /VM/my.image" > and than configure that loop1 as a disk: > > on server1 { > device /dev/drbd0; > disk /dev/loop1 > address 192.168.2.1:7788; > meta-disk internal; > } do not do this. drbd on top of loop _will_ deadlock sooner or later. you have been warned. > or can I just do: > > on server1 { > device /dev/drbd0; > disk /VM/my.image > address 192.168.2.1:7788; > meta-disk internal; > } > > > > > > But then (I think), you can't do a live migration ?? > > because there's no software making sure that writes to the image from both > > server do not write to the same block at the same time. (GFS does that) > > > > If you don't need live migration, you can use the loop, but when you want to > > migrate (in a controlled manner, not failover), you have to do the following > > steps: > > - On Server A, stop Xen DomU > > - On Server A, umount loop1 (drbd1) > > - On Server A, set drbd1 from primary to secundairy > > - On Server B, set drbd1 from secundairy to primary > > - On Server B, mount loop1 (drbd1) > > - On Server B, Start Xen VM. > > > we dont use live migration, for now. > We just need a failover of the 1. VM goes offline we need the other > one, with actuall data > > I cant use a real partition because we have some VM on that machine > that dont need drbd replication, > also some are alone and others just do a mysql replication(inside the VM). > > cheers > > .rupertt > > > Regards, > > Robert > > > > -- > > *Exa-Omicron* > > Patroonsweg 10 > > 3892 DB Zeewolde > > Tel.: 088-OMICRON (66 427 66) > > Fax: 088-66 427 69 > > http://www.exa-omicron.nl > > _______________________________________________ > > drbd-user mailing list > > drbd-user at lists.linbit.com > > http://lists.linbit.com/mailman/listinfo/drbd-user > > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > -- : Lars Ellenberg http://www.linbit.com : : DRBD/HA support and consulting sales at linbit.com : : LINBIT Information Technologies GmbH Tel +43-1-8178292-0 : : Vivenotgasse 48, A-1120 Vienna/Europe Fax +43-1-8178292-82 : __ please don't Cc me, but send to list -- I'm subscribed