[Linux-cluster] Mirrored LVM device and recovery

[Andreas Bleischwitz]

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Hello all,

we are currently facing some handling issues using mirrored LVM-lvols in
a cluster:

We have two diffent storage systems which should be mirrored using
host-based mirroring.
AFAIK cmirrored lvols are the only supported mirroring solution under
RHEL56. So we have three multipath devices which are used for 2 data and
one log-volume.
We added these three pvs to one volumegroup and created the logical
volume using the following command:
lvcreate -m1 -L 10G -n lv_mirrored /dev/mpath/mpath0p1 /dev/mpath2p1
/dev/mpath/mpath1p1

The volume replicates ok and everything is fine.... until we remove one
storage-side of the mirror. Then LVM simply removes the missing pv and
the mirror is simply removed - which I think is ok; if it will be
recreated after readding the failed mirror-side.
Unfortunately LVM doesn't do anything such - is there a special
configuration-option which we missed?

And keep in mind: there might be a huge amount of lvms which have to be
re-mirrored. So manual interaction shouldn't be the default option ;)

Regards,

Andreas
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