Hi Andreas El mar, 15-12-2009 a las 15:31 +0100, Andreas Pfaffeneder escribió: > Hi Rafael, > > Am 14.12.2009 23:15, schrieb Rafael Micó Miranda: > > Hi all, > > > > I was wondering if there is a way to achieve a "quorum disk over a RAID > > software device" working CMAN cluster. > > > > > in a similar situation I am using a raid-1 device (built with mdadm > prior to the startup of cman/rgmanager) which consists of two luns, one > in each location. This works pretty well as quorum-device. > > Andreas > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster Today I tried this approach, but I have no previous experience with MDADM. The problem I found was, how do you manage multipath on the different LUNs without device-mapper-multipath? As I see in the system logs the MD driver loads before device-mapper-multipath is working, and it uses the devices (/dev/sdX) to assemble the RAID devices (/dev/mdX) before the devices are available through device-mapper-multipath (/dev/mapper/quorumdiskX) at system boot time. This even makes the device-mapper-multipath devices not getting built when multipathd starts after that. Does this happen to you? So, I tried to configure a multipath device with MDADM and after that use the built devices to assemble a RAID1 MD device. This was the config in mdadm.conf I used: DEVICE /dev/sd* ARRAY /dev/md1 metadata=1.1 level=multipath num-devices=2 name=multipath01 ARRAY /dev/md2 metadata=1.1 level=multipath num-devices=2 name=multipath02 ARRAY /dev/md3 metadata=1.2 level=raid1 num-devices=2 name=quorum devices=/dev/md1,/dev/md2 Devices where all with the "Linux raid auto" partition mark. When I built the MDs first everything seemed to work, but after a system boot the /dev/md3 device was not built, so the quorum disk would not be available for CMAN. How do you implement this with MDADM? Thanks in advance, Rafael -- Rafael Micó Miranda -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
