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

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Live Storage Migration in oVirt - over and under the hood

Live Storage Migration in oVirt - over and under the hood

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  • 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

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