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qemumigrationsrcissafe
2019 Jul 29
3
Why librbd disallow VM live migration if the disk cache mode is not none or directsync
I'm curious that why librbd sets this limitation? The rule first
appeared in librbd.git commit d57485f73ab. Theoretically, a
write-through cache is also safe for VM migration, if the cache
implementation guarantees that cache invalidation and disk write are
synchronous operations.
For example, I'm using Ceph RBD images as VM storage backend. The Ceph
librbd supports synchronous