Re: ceph iscsi questions

Kurt Bauer <kurt.bauer@xxxxxxxxxxxx> · Tue, 18 Jun 2013 09:52:53 +0200

Hi,

Da Chun schrieb:
Hi List,

  I want to deploy a ceph cluster with latest cuttlefish, and 
export it with iscsi interface to my applications.
  Some questions here:
  1. Which Linux distro and release
 would you recommend? I used Ubuntu 13.04 for testing purpose 
before.

For the ceph-cluster or the "iSCSI-GW"? We use Ubuntu 12.04 LTS for the 
cluster and the iSCSI-GW, but tested Debian wheezy as iSCSI-GW too. Both
 work flawless.

  2. Which iscsi target is better? LIO, SCST, or others?

Have you read http://ceph.com/dev-notes/adding-support-for-rbd-to-stgt/ ?
 That's what we do and it works without problems so far.

  3. The system for the iscsi target will be a single point of 
failure. How to eliminate it and make good use of ceph's nature of 
distribution?

That's a question we asked aourselves too. In theory one can set up 2 
iSCSI-GW and use multipath but what does that do to the cluster? Will 
smth. break if 2 iSCSI targets use the same rbd image in the cluster? 
Even if I use failover-mode only?

Has someone already tried this and is willing to share their knowledge?

Best regards,

Kurt

  Thanks!
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