[DRBD-user] Problems with drbdf on multipathed devices

Robert.Koeppl at knapp.com Robert.Koeppl at knapp.com
Mon Oct 12 15:51:27 CEST 2009

Note: "permalinks" may not be as permanent as we would like,
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Hi all!
I am experiencing some severe problems with drbd on multipathed devices.
Setup consists of two Bladecenter H with HS21 Blades and Qlogic HBA, 
DS4700 Storages.
Sles 11 x86_64, DRBD 6.3.4 
The system is running an oracle database and some custom made 
applications. As long as the nodes are connected to their respective 
storage systems, everyting works fine. If I disconnect the storage from 
the master node however, the drbd does not detach the drive, bit keeps 
happily running without reporting any error. The Kernel shows the paths 
and disks failed, so there seems to be a problem between the drbd and the 
devicemapper multipath drivers. Normal Path-failovers with only one path 
going down work well, so the dmmp seems to work ok.
What I would need, is a system, that does fail over to the machine that 
still has physical connection to its disks.
Handler is set to detach.
Thanks in advandce for your help
 Best regards,
Robert Köppl
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