Add out-of-band RAID configuration support for Cisco Hardware
This blueprint adds support for RAID configuration on Cisco UCS Manager managed UCS B/C/M-series servers using out-of-band method. UcsSdk exposes interface for RAID configuration via OOB, this proposal uses this interface and adds RAID configuration support for UCS drivers. Change-Id: Iceb7033355c7b5054cdc9036a88d9e9ad79e9018
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saripurigopi
GopiKrishna Saripuri
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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======================================================
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Out-of-band RAID configuration using Cisco UCS drivers
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======================================================
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https://bugs.launchpad.net/ironic/+bug/1526362
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This blueprint proposes to implement out-of-band RAID configuration interface
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for Cisco UCS drivers. This implementation supports configuration of Cisco
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UCS Manager (UCSM) managed B/C/M-series servers.
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Problem description
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===================
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Currently pxe_ucs and agent_ucs drivers don't support RAID configuration on
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UCSM managed servers.
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Proposed change
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===============
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It proposes implementing the RAID interface as described by the parent spec [1]
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for UCS drivers.
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List of changes required:
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* ucs.raid.RAIDInterface for RAID configuration operations
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The following methods will be implemented:
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* validate
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* create_configuration
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* delete_configuration
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validate() method validates the required UCS parameters for OOB RAID
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configuration. Also calls validate() of the super class to validate json
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schema.
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create_configuration and delete_configuration operations are implemented
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as asynchronous RAID configuration deployment operations by UCS drivers.
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UcsSdk/UCS-API asynchronously deploys the RAID configuration on the target
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node. UCS driver(s) sends the RAID configuration simultaneously to the
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target node when the operation is invoked, but UCS Manager would not deploy
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the configuration simultaneously on the target node. UCS Manager accepts
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the RAID configuration and deploys it as part of UCS Manager FSM deploy
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state. Hence there will be delay between, when the operation is invoked
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and when the RAID configuration is deployed. To know the deploy status,
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we need to query the FSM status using UcsSdk API. These methods return
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states.CLEANWAIT.
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New driver periodic task will be added to fetch the UCSM FSM status of
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these operations. This periodic task is enabled only if pxe_ucs, agent_ucs
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drivers are enabled in the conductor.
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* RAID management changes:
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Controlling the RAID configuration is creating storage-profile ManagedObject
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and associating with the Server object in UCS Manager 2.4. Earlier version
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of UCSM requires to configure LocalDiskConfigPolicy and associate with
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respective service-profile ManagedObject. The service-profile information is
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captured as part of node driver_info properties.
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UcsSdk provides RAIDHelper interface, which actually creates the required
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policies specified above. UCS driver uses this interface and makes
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appropriate calls to create_config and delete_config operations.
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Alternatives
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------------
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Operator can change the RAID configuration manually whenever required after
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putting the node to MANAGEABLE state. But this has to be done for each node.
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Data model impact
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-----------------
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None
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State Machine Impact
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--------------------
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None
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REST API impact
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---------------
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None
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Client (CLI) impact
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-------------------
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None
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RPC API impact
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--------------
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None
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Driver API impact
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-----------------
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None
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Nova driver impact
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------------------
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None
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Security impact
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---------------
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None
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Other end user impact
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---------------------
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None
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Scalability impact
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------------------
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None
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Performance Impact
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------------------
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None
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Other deployer impact
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---------------------
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None
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Developer impact
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----------------
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None
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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saripurigopi
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Work Items
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----------
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* Add UcsRAIDManagement inheriting from base.RAIDInterface for ucs drivers.
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* Writing and unit-test cases for RAID interface of ucs drivers.
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* Writing configuration documents.
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Dependencies
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============
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* UcsSdk to support RAID configuration utility
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Testing
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=======
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Unit-tests will be implemented for RAID interface of ucs driver.
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Upgrades and Backwards Compatibility
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====================================
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Adding RAID interface support for ucs drivers will not break any
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compatibility with either REST API or RPC APIs.
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Documentation Impact
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====================
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* Writing configuration documents.
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References
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==========
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.. [1] New driver interface for RAID configuration: https://review.openstack.org/173214
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@ -0,0 +1 @@
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../approved/cisco-ucs-oob-raid-configuration.rst
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