On Nov 19, 2014 9:34 PM, "Dietmar Maurer" <diet...@proxmox.com> wrote: > > > > > AFAIK kvm live migration issues a disk flush, so that should not be a problem? > > > > > > > > Out if sync blogs do not appear during migration, they appear under normal > > work > > > > load. > > > > > > I do not really understand that. What do you mean by "Out if sync blogs do not > > appear during migration"? > > Out of sync blocks are blocks that contain different data on two nodes. Such > > blocks appear when a VM just work under normal load and usually it happens for > > the area where VM's swap is placed. The longer VM is online, the more out of > > sync blocks appear. If we try to migrate such a VM online it will crash because > > data in VM's swap will be different after migration. > > Again, migration code flush all changes to disk, so there are no "out of sync" blocks > after migration. What do I miss? >
These blocks are not in ram anymore and considered to be properly committed while in fact they committed not property. Nothing to flush. Stanislav
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