On Wed, Feb 23, 2011 at 12:19:20PM +0000, Stallmann, Andreas wrote: > Hi! > > >> - (3) rules out sbd, as this method requires access to a physical device, > >> that offers the shared storage. Am I right? The manual explicitly says, > >> that sbd may even not be used on a DRBD-Partition. Question: Is there a > >> way to insert the sbd-Header on a mounted drive instead of a physical > >> partition? Are there any other methods of ressource fencing besides sbd? > > >The only requirement for sbd is to have a dedicated disk on shared storage. > >That disk (or partition, if you will) doesn't > > need to be big (1MB is enough). I don't see how (3) then is an obstacle. > > Let me see, if I got the manual (see: > http://www.linux-ha.org/wiki/SBD_Fencing) right: > > a) Our customer might only grant us one storage access via nfs. Can one > create an sbd on a NFS-share?
Please no-one try a loop-mounted image file on NFS ;-) Even though in theory it may work, if you mount -o sync ... *Outch* > b) If we set up a shared storage ourselves, we want it to be redundant > itself, thus setting it up with drbd is very likely. The manual says: > "The SBD device must not make use of host-based RAID. " and "The SBD > device must not reside on a drbd instance." > > Did I get this right: The sbd-Partition is not allowed to reside on > either a RAID or a DBRD? Well? Doesn't that mess with the concept of > redundancy? Let's say, we have a three-node shared storage, using DRBD > to keep the partitions redundant between the shared-storage nodes, > exporting the storage tot he other nodes via NFS: Where and how shall > the sbd device be created? Only on one oft he storage nodes? Or on > each oft he storage nodes? Or somehow on a clustered partition (that > would mean drbd, again, wouldn't it?). > > To me only the latter makes sense, because, as the manual says: > > "This can be a logical unit, partition, or a logical volume; but it > must be accessible from all nodes." > > Aaaaahhhh... my brain is starting to explode... ;-) Does this help? http://www.linux-ha.org/w/index.php?title=SBD_Fencing&diff=481&oldid=97 -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. _______________________________________________ Linux-HA mailing list Linux-HA@lists.linux-ha.org http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
