Ceph

h1. Clustered SCSI target using RBD Status

h3. Summary

The goal of this project is to modify the Linux target layer, LIO, to be able to support active/active access to a device across multiple nodes running LIO. The changes to LIO are being done in a generic way to allow other cluster aware devices to be used, but our focus is on using RBD.

More info can be found in the Hammer blue print here:

https://wiki.ceph.com/Planning/Blueprints/Hammer/Clustered_SCSI_target_using_RBD

This will be a update on what has been completed and open issues.

h3. Owners

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h3. Interested Parties

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h3. Current Status

h3. Detailed Description

Open issues from the Hammer blue print include:

1. - SCSI task management (TMF) / Unit Attention (UA) / PREEMPT AND ABORT Handling.

This has not yet been worked on since the Hammer discussion.

2. Configuration and Device State.

- The current plan is to use pacemaker/corosync for the setup and syncing device state across nodes.

- For management, I am looking into implementing a libStorageMgmt (http://sourceforge.net/projects/libstoragemgmt/) plugin, so tools like lsmcli can manage the target.

Both of these need more research and discussion.

h3. Work items

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h4. Build / release tasks

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h4. Documentation tasks

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h4. Deprecation tasks

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