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Live Storage Migration in oVirt
Over and Under the Hood
Allon Mureinik
Team Lead, Cloud Storage, Red Hat
May 2013

Allon Mureinik - Live Storage Migration Over and Under Hood

1
A bird’s eye view of oVirt

Allon Mureinik - Live Storage Migration Over and Under Hood

2
“Language is the means of
getting an idea from my
brain into yours without
surgery.”
(Mark Amidon)

Allon Mureinik - Live Storage Migration Over and Under Hood

3
oVirt Architecture

Allon Mureinik - Live Storage Migration Over and Under Hood

4
Live Storage Migration
Over the Hood

Allon Mureinik - Live Storage Migration Over and Under Hood

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Live Storage Migration in a Nutshell
Definition
●

The capability to move one or more VM Disks from one
storage to another without interrupting the guest
operations

Motivation
●

Facilitate storage hardware upgrades

●

Assist smarter disk provisioning

●

Allow storage re-purposing

Allon Mureinik - Live Storage Migration Over and Under Hood

6
A Picture is Worth 1024 Words
Host A

Host A

VM

Virtual Disk

Storage A

Storage B

VM

Virtual Disk

Storage A

Storage B

Allon Mureinik - Live Storage Migration Over and Under Hood

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Live Storage Migration
Under the Hood

Allon Mureinik - Live Storage Migration Over and Under Hood

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Flow Overview 1/4 – Initial State

Volume 1

Allon Mureinik - Live Storage Migration Over and Under Hood

9
Flow Overview 2/4 – Live Snapshot

Volume 1

Volume 1

Volume 2

Allon Mureinik - Live Storage Migration Over and Under Hood

10
Flow Overview 3/4 – Replica & Copy

Volume 1

Volume 1

Volume 2

Volume 1

Volume 2

Volume 1'

Volume 2'

Allon Mureinik - Live Storage Migration Over and Under Hood

11
Flow Overview 4/4 - Completion

Volume 1

Volume 1

Volume 2

Volume 1

Volume 2

Volume 1'

Volume 2'

Volume 1'

Volume 2'

Allon Mureinik - Live Storage Migration Over and Under Hood

12
Error Handling
●

If any error occurs before the copy/replica is
completed:
●
●

●

Replication is stopped
The volumes on the destination domain are deleted

If any error occurs after the copy/replica is completed:
●

The VM is essentially OK

●

Junk on the source domain should be cleaned up

Allon Mureinik - Live Storage Migration Over and Under Hood

13
Looking Forward

Allon Mureinik - Live Storage Migration Over and Under Hood

14
Road Map
●

Allow Live Storage Migration of multiple VM disks
●

●

Integrate live merge and don’t keep the snapshot
●

●

Supported in QEMU, requires integration

Snapshot only the migrated disk
●

●

Done in oVirt 3.2

Mainly a UI/management issue

Combine with Live VM Migration

Allon Mureinik - Live Storage Migration Over and Under Hood

15
How to get involved?
●

Main project site:
●

●

Useful wikis
●

●

http://www.ovirt.org
http://www.ovirt.org/Features/Design/StorageLiveMigration

Mailing Lists:
●

users@ovirt.org

●

arch@ovirt.org

●

engine-devel@ovirt.org

●

vdsm-devel@lists.fedorahosted.org

Allon Mureinik - Live Storage Migration Over and Under Hood

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Q&A

Allon Mureinik - Live Storage Migration Over and Under Hood

17

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Live Storage Migration in oVirt (Open Storage Meetup May 2013)

  • 1. Live Storage Migration in oVirt Over and Under the Hood Allon Mureinik Team Lead, Cloud Storage, Red Hat May 2013 Allon Mureinik - Live Storage Migration Over and Under Hood 1
  • 2. A bird’s eye view of oVirt Allon Mureinik - Live Storage Migration Over and Under Hood 2
  • 3. “Language is the means of getting an idea from my brain into yours without surgery.” (Mark Amidon) Allon Mureinik - Live Storage Migration Over and Under Hood 3
  • 4. oVirt Architecture Allon Mureinik - Live Storage Migration Over and Under Hood 4
  • 5. Live Storage Migration Over the Hood Allon Mureinik - Live Storage Migration Over and Under Hood 5
  • 6. Live Storage Migration in a Nutshell Definition ● The capability to move one or more VM Disks from one storage to another without interrupting the guest operations Motivation ● Facilitate storage hardware upgrades ● Assist smarter disk provisioning ● Allow storage re-purposing Allon Mureinik - Live Storage Migration Over and Under Hood 6
  • 7. A Picture is Worth 1024 Words Host A Host A VM Virtual Disk Storage A Storage B VM Virtual Disk Storage A Storage B Allon Mureinik - Live Storage Migration Over and Under Hood 7
  • 8. Live Storage Migration Under the Hood Allon Mureinik - Live Storage Migration Over and Under Hood 8
  • 9. Flow Overview 1/4 – Initial State Volume 1 Allon Mureinik - Live Storage Migration Over and Under Hood 9
  • 10. Flow Overview 2/4 – Live Snapshot Volume 1 Volume 1 Volume 2 Allon Mureinik - Live Storage Migration Over and Under Hood 10
  • 11. Flow Overview 3/4 – Replica & Copy Volume 1 Volume 1 Volume 2 Volume 1 Volume 2 Volume 1' Volume 2' Allon Mureinik - Live Storage Migration Over and Under Hood 11
  • 12. Flow Overview 4/4 - Completion Volume 1 Volume 1 Volume 2 Volume 1 Volume 2 Volume 1' Volume 2' Volume 1' Volume 2' Allon Mureinik - Live Storage Migration Over and Under Hood 12
  • 13. Error Handling ● If any error occurs before the copy/replica is completed: ● ● ● Replication is stopped The volumes on the destination domain are deleted If any error occurs after the copy/replica is completed: ● The VM is essentially OK ● Junk on the source domain should be cleaned up Allon Mureinik - Live Storage Migration Over and Under Hood 13
  • 14. Looking Forward Allon Mureinik - Live Storage Migration Over and Under Hood 14
  • 15. Road Map ● Allow Live Storage Migration of multiple VM disks ● ● Integrate live merge and don’t keep the snapshot ● ● Supported in QEMU, requires integration Snapshot only the migrated disk ● ● Done in oVirt 3.2 Mainly a UI/management issue Combine with Live VM Migration Allon Mureinik - Live Storage Migration Over and Under Hood 15
  • 16. How to get involved? ● Main project site: ● ● Useful wikis ● ● http://www.ovirt.org http://www.ovirt.org/Features/Design/StorageLiveMigration Mailing Lists: ● users@ovirt.org ● arch@ovirt.org ● engine-devel@ovirt.org ● vdsm-devel@lists.fedorahosted.org Allon Mureinik - Live Storage Migration Over and Under Hood 16
  • 17. Q&A Allon Mureinik - Live Storage Migration Over and Under Hood 17