[pve-devel] create snapshots

Dietmar Maurer dietmar at proxmox.com
Fri Aug 31 13:22:29 CEST 2012

> >>I wonder it is would be safe to call an external script to create the snapshot
> there?
> >>Or is there still some data in the qemu block driver cache, or the host
> cache?
> yes, I think taking snapshot don't flush datas.
> rbd devs said me that we need to freeze the filesystem with qemu-ga if we
> want to be sure that's all is fine.
> (Or filesystem will do a fsck at start to correct the missing data with his
> journal).
> But if we save the state, that's not a problem, as the vm will save the
> missings data in the memory and will flush them when the vm will reload the
> state.

No, I meant a different issue. What if data is on the host/network cache? But I guess we 
can assume that an fsync on the iscsi connection makes sure that all data is written?  

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