Hey everyone,
Is anybody aware of a /true/ active/active multi-head and multi-target clustered iSCSI daemon?
IE:
Server 1: Hostname: host1.test.com IP Address: 10.0.0.1
Server 2: Hostname: host2.test.com IP Address: 10.0.0.2
Then they would utilize a CLVM disk between them, let's call that VG "disk" and then directly map each LUN (1,2,3,4,etc) to LV's named 1,2,3,4,... and so on.
That would essentially make both host1 and host2 identical iSCSI targets. So I could hook up 30 servers to each LUN on each host1 and host2 (assuming those block devices had a cluster aware filesystem on them).
However, what I wan't to accomplish is true active/active MPIO utilizing the dm driver to combine LUN 1 from both host1 and host2 as a single /dev/dm-0 device in active/active mode.
This would allow me to multipath across multiple fabrics, develop true high availability and increase my throughput significantly.
Any idea of an iscsi tgtd that supports this? As far as I can tell, none do (that I can find). I know some proprietary vendors have this type of functionality, which may or may not be using iSCSI code (but that's a whole set of arguments for later..).
Ultimately, my goal is this.
I want to take my existing Ceph cluster, expose a handful of RBDs from it to two iSCSI heads running C6 or RHEL6 or what have you, so I can use my inexpensive storage built on Linux -- for my Windows 2008 machines.
Thoughts?
Steven Crothers steven.crothers@gmail.com