which Linux iSCSI target support SCSI 3 Persistant reservations?

SCST supports SCSI 3 persistent reservations.

FreeNAS iSCSI targets support SCSI-3 Persistent Reservations. I built a two node Windows Server 2008 R2 cluster running Hyper-V role and was able to Live Migrate a VM from one host/node to the other.

The one you need to start looking for is linux-iscsi. It's replacing the kernel iscsi target modules as of 2.6.38 (not yet released, but soon, git). It does support SCSI-3 persistant reservations, I'm using it right now on OpenSUSE 11.3 with a Microsoft Failover Cluster consuming storage via iSCSI.

This comparison chart from the SCST project includes information about which projects support persistent reservations.

Additionally, the following mailing list thread may be of interest:

• http://www.spinics.net/lists/linux-stgt/msg02144.html

This is my post to the linux-stgt (aka tgt) project mailing list, which includes some examples of using the sg3-utils package to test SCSI reservations. At the time of this post, the tgt project had support for persistent reservations, but did not support the PR_OUT_PREEMPT_AND_ABORT service action necessary to support RHEL5 i/o fencing.