[CentOS] iSCSI Question

Tue Dec 4 09:11:21 UTC 2012
joel billy <jbilly2002 at gmail.com>

On 11/17/12, Steven Crothers <steven.crothers at gmail.com> wrote:
> Hey everyone,
> Is anybody aware of a /true/ active/active multi-head and multi-target
> clustered iSCSI daemon?

Hi Steven,

If i'm correct you are looking for a shared storage clustering setup
with HA. Does this help

Please note that i have only used their software in a stand alone
installation and cannot give feedback on the clustering feature. Also
i'm not sure if its works LVM - check with them.


> IE:
> Server 1:
> Hostname: host1.test.com
> IP Address:
> Server 2:
> Hostname: host2.test.com
> IP Address:
> 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 at gmail.com
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