.. This work is licensed under a Creative Commons Attribution 3.0 Unported License. http://creativecommons.org/licenses/by/3.0/legalcode ============================================== In-band RAID configuration using agent ramdisk ============================================== https://blueprints.launchpad.net/ironic/+spec/inband-raid-configuration This spec proposes to implement a RAID configuration interface using Ironic Python Agent (IPA). The first driver to make use of this interface will be the ``agent_ilo`` driver. Problem description =================== Currently there is no way in Ironic to do RAID configuration for servers using in-band mechanism. Proposed change =============== This spec proposes to implement in-band RAID configuration using IPA. It proposes to implement the ``RAIDInterface`` as mentioned in the parent spec [1]. The implementation will be named ``AgentRAIDManagement``. The main job of the implementation will be to invoke the corresponding RAID operation methods on agent ramdisk. Interested vendors will implement these methods in Ironic Python Agent using hardware managers. Following are the changes required: * The following methods will be implemented as part of ``AgentRAIDManagement``: + ``create_configuration`` - This will create the RAID configuration on the bare metal node. The following are the steps: - Calls ``zap.create_raid_configuration`` on the agent ramdisk passing the details of ``raid_info``. .. note:: This is a zap step that requires the agent to be booted on the bare metal node before this method is invoked. This is a common problem for all zap steps the use the agent and mechanism for this will be introduced as part of Zapping spec [2]. We assume here that ramdisk is booted and heartbeating before this method is invoked. Reference to the IRC chat about this in [3]. + ``delete_configuration`` - This will delete the RAID configuration on the bare metal node. The following are the steps: - Calls ``zap.delete_raid_configuration`` on the agent ramdisk. * The results for both of the above commands will be polled on subsequent heartbeats from the ramdisk and then ``update_raid_info`` will be called once the RAID operation is done. * Agent ramdisk will be enhanced to add two new methods ``zap.create_raid_configuration`` and ``zap.delete_raid_configuration``. These methods will route the call to hardware manager, so that different hardware vendors can implement their own methods of managing RAID on their hardware. Alternatives ------------ Some bare metal servers do not support out-of-band RAID configuration. They support only in-band raid configuration. I don't see any other alternative other than making use of a ramdisk to do this. Data model impact ----------------- None. REST API impact --------------- None. RPC API impact -------------- None. Driver API impact ----------------- None. Nova driver impact ------------------ None. Security impact --------------- None. Other end user impact --------------------- None. Scalability impact ------------------ None. Performance Impact ------------------ None. Other deployer impact --------------------- None. Developer impact ---------------- Other hardware vendors developing drivers for OpenStack can use Ironic Python Agent for in-band RAID configuration. They can add their own hardware manager implementing the method and get the RAID configuration done. Implementation ============== Assignee(s) ----------- rameshg87 Work Items ---------- * Implement ``AgentRAIDManagement`` * Make changes in Ironic Python Agent to add methods ``zap.create_raid_configuration`` and ``zap.delete_raid_configuration`` which route calls to respective hardware manager. Dependencies ============ * Implement Zapping States - https://review.openstack.org/140826 Testing ======= Unit tests will be added. Upgrades and Backwards Compatibility ==================================== None. Documentation Impact ==================== None. Most of the RAID configuration details in Ironic are covered in the parent spec. If anything is required in addition, respective vendors making use of ``AgentRAIDManagement`` will need to document it. References ========== [1] - New driver interface for RAID configuration https://review.openstack.org/135899 [2] - Implement Zapping States - https://review.openstack.org/140826 [3] - IRC Chat - http://eavesdrop.openstack.org/irclogs/%23openstack-ironic/%23openstack-ironic.2015-02-04.log (From 2015-02-04T17:41:09)