Re: ceph iscsi questions

["Da Chun" <ngugc@xxxxxx>]

Thanks for sharing! Kurt.

Yes. I have read the article you mentioned. But I also read another one: http://www.hastexo.com/resources/hints-and-kinks/turning-ceph-rbd-images-san-storage-devices.  It uses LIO, which is the current standard Linux kernel SCSI target.

There is another doc in the ceph site: http://ceph.com/w/index.php?title=ISCSI&redirect=no

I don't quite understand how the multi path works here. Are the two ISCSI targets on the same system or two different ones?

Has anybody tried this already?

------------------ Original ------------------

From:  "Kurt Bauer"<kurt.bauer@xxxxxxxxxxxx>;

Date:  Tue, Jun 18, 2013 03:52 PM

To:  "Da Chun"<ngugc@xxxxxx>;

Cc:  "ceph-users"<ceph-users@xxxxxxxxxxxxxx>;

Subject:  Re: [ceph-users] ceph iscsi questions

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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