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Volume Mirroring (Havana Summit)
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Avishay Traeger
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Introduction and example workflow for volume mirroring Cinder Havana proposal
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Volume Mirroring (Havana Summit)
1.
Volume Mirroring Presenter: Avishay
Traeger avishay@il.ibm.com IBM Research – Haifa © 2013 IBM Corporation
2.
Agenda ● Goal ● Definitions ● Example flow 1:
Single Cinder deployment – ● HA, shorter-distance DR Example flow 2: Multiple Cinder deployments – Longer-distance DR © 2013 IBM Corporation
3.
Goal ● ● Multiple consistent copies
of selected volumes to mitigate failures of varying degrees Flexible framework for enabling mirroring technologies – Where? – Back-end: driver/storage ● Front-end: OS-level, hypervisor How? ● ● ● Several techniques for volume mirroring Biggest difference is RPO and RTO © 2013 IBM Corporation
4.
Recovery Point Objective
(RPO) Recovery Time Objective (RTO) Recovery Point Objective How far back in time a disaster takes one RPO=0 synchronous copy Recovery Time Objective How long until operational after a disaster RTO=0 hot backup site © 2013 IBM Corporation
5.
Main technologies ● Synchronous – – ● Write to
both copies before returning ACK Always consistent Asynchronous – ● Write to primary, ACK, forward to secondary ASAP Periodic – Accumulate changes and send to secondary periodically © 2013 IBM Corporation
6.
Single Cinder deployment:
Admin setup a b ● 2 storage entities in a single Cinder deployment (e.g., controller, file system) © 2013 IBM Corporation
7.
Single Cinder deployment:
Admin setup a ● ● b 2 storage entities in a single Cinder deployment (e.g., controller, file system) Mirroring is set up at a certain level (e.g., controller, file set) © 2013 IBM Corporation
8.
Single Cinder deployment:
Admin setup a ● ● ● b 2 storage entities in a single Cinder deployment (e.g., controller, file system) Mirroring is set up at a certain level (e.g., controller, file set) Admin must ensure network connectivity between mirror participants (e.g., a-b) © 2013 IBM Corporation
9.
Single Cinder deployment:
Admin setup a ● volume_backend_name=pool1 ● ● volume_backend_name=pool2 ● 2 storage entities in a single Cinder deployment (e.g., controller, file system) Mirroring is set up at a certain level (e.g., controller, file set) Admin must ensure network connectivity between mirror participants (e.g., a-b) Each may have one or more pools managed by Cinder which store volumes volume_backend_name=pool3 b © 2013 IBM Corporation
10.
Single Cinder deployment:
Admin setup a ● volume_backend_name=pool1 mirroring_unit_id=a ● ● volume_backend_name=pool2 mirroring_unit_id=b volume_backend_name=pool3 mirroring_unit_id=b b ● ● 2 storage entities in a single Cinder deployment (e.g., controller, file system) Mirroring is set up at a certain level (e.g., controller, file set) Admin must ensure network connectivity between mirror participants (e.g., a-b) Each may have one or more pools managed by Cinder which store volumes Drivers report id of mirroring participant (e.g., controller, file set) © 2013 IBM Corporation
11.
Single Cinder deployment:
Admin setup a volume_backend_name=pool1 mirroring_unit_id=a ● Admin creates partnerships – storage pairs with the potential to mirror between them volume_backend_name=pool2 mirroring_unit_id=b volume_backend_name=pool3 mirroring_unit_id=b b © 2013 IBM Corporation
12.
Single Cinder deployment:
Admin setup a ● volume_backend_name=pool1 mirroring_unit_id=a mirroring_capabilities=[b, [sync,async], active-passive] ● Admin creates partnerships – storage pairs with the potential to mirror between them Drivers report mirroring capabilities with each partner volume_backend_name=pool2 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] volume_backend_name=pool3 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] b © 2013 IBM Corporation
13.
Single Cinder deployment:
User actions a volume_backend_name=pool1 mirroring_unit_id=a mirroring_capabilities=[b, [sync,async], active-passive] ● User creates a volume, specifying mirror requirements in volume type: sync, active-passive. Candidates: any in a/b 1 volume_backend_name=pool2 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] volume_backend_name=pool3 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] b © 2013 IBM Corporation
14.
Single Cinder deployment:
User actions a ● 2 volume_backend_name=pool1 mirroring_unit_id=a mirroring_capabilities=[b, [sync,async], active-passive] ● 1 volume_backend_name=pool2 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] User creates a volume, specifying mirror requirements in volume type: sync, active-passive. Candidates: any in a/b User creates second volume, passes requirements in volume type, and first volume's id as scheduler hint. Candidates: any in a volume_backend_name=pool3 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] b © 2013 IBM Corporation
15.
Single Cinder deployment:
User actions a ● 2 volume_backend_name=pool1 mirroring_unit_id=a mirroring_capabilities=[b, [sync,async], active-passive] ● 1 volume_backend_name=pool2 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] volume_backend_name=pool3 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] b ● User creates a volume, specifying mirror requirements in volume type: sync, active-passive. Candidates: any in a/b User creates second volume, passes requirements in volume type, and first volume's id as scheduler hint. Candidates: any in a User creates a mirror relationship between the two volumes and optionally starts the copy © 2013 IBM Corporation
16.
Multi-Cinder deployment Local cloud_id
= primary a volume_backend_name=pool1 mirroring_unit_id=a mirroring_capabilities=[b, [sync,async], active-passive] volume_backend_name=pool2 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] volume_backend_name=pool3 mirroring_unit_id=b mirroring_capabilities=[a, [sync,async], active-passive] b Remote cloud_id = DRsite1 Consider two or more Cinder deployments Problem The mirror I/O is unchanged, but we can't control placement on the remote cloud and don't want the local driver calling the remote driver directly Solution Local Cinder communicates with a gateway, and the gateway calls public Cinder APIs on the other sites © 2013 IBM Corporation
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