[linux-lvm] Is cLVM necessary when accessing different logical volumes on a shared iSCSI target?

[Christian Schröder]

Hi Matthew,
thanks again for your comments. The idea to use tags is very 
interesting. I will have a deeper look at it. However, I still do not 
understand if filtering (either hard-coded or using tags) is *necessary* 
to make things working or if it is just *adviseable* to prevent using a 
volume simultaneously from both clients?
When I tried to set up the scenario as described, I encountered another 
problem which might be related to the sharing stuff: When I virtually 
disconnect the physical volume (by disconnecting from the iSCSI server) 
and reconnect again, I get i/o errors when I try to access a logical 
volume. I have tried pvscan, vgscan and lvscan, but nothing helps. 
Interestingly, the volume group and all logical values are found by 
vgscan / lvscan, but I cannot access it. Is this the expected behavior? 
Is there any chance (besides rebooting the client machine) to recover 
from such a situation?

Regards,
Christian

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