Question about how to share dm-thin on multiple hosts

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Hi all,

I am new to dm-devel. When using dm-thin via lvm, I found it difficult to share dm-thin on multiple hosts.

The background is that I want to implement live migration of VMs in the lvm + iSCSI environment, in which lvmlockd is used to coordinate access to shared storage. There are multiple hosts in the cluster using the same iSCSI connection, and the VMs running in this environment use thinlv volumes. But if want to live migrate the vm, it will be difficult since thinlv which from the same thin pool can only be exclusive active on one host.

I'm curious why the dm-thin doesn't support multi-host shared access, just like the dm-linear does. If I try to write a new dm-thin target or make some modifications based on the existing dm-thin target to support this feature, is it technically feasible?

Regards!

Zhiyong Ye

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