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xen-users
Re: [Xen-users] Xen 4.0 feature request
On 07/07/09 16:38, Enrico Valsecchi wrote:
During my message in this thread, I have write that vmware
have a very powerfull tool that allow to try a consistent snapshot....
....I does not have idea that this tool work, but....
...it work!
And it's make vmware very powerfull, with a really and simple backup
possibility,
regardless environment....
Xen's snapshot method is no less good than vmware's, it's just
different. For VMware workstation you can have a nice gui where you
have a snapshot and you can see hierarchies of snapshots and it's all
really nice. For xen you have to do this "by hand" on the command line,
but it's no less flexible. You could write a fancy gui to keep track of
your snapshots though.
You could argue that a VMware snapshot is much more flexible because it
doesn't require a complete copy of the disk and the memory of the
running guest to be stored. Well, if you use one of the numerous
copy-on-write mechanisms (qcow, lvm, zfs, btrfs, reflink, probably
others) you can do the same, but xen doesn't need to implement that for you.
And then you've got the problem of getting the guest into a consistent
shape for the snapshot because that's how you do backups. VMware seems
to tout this quite a lot, but what's not mentioned is that is requires
cooperation from the guest and the applications running in it. This is
no different from vmware.
VMware has nice point and shoot (or point and click) mechanisms for
taking snapshots and that makes it look really nice and powerful. When
you get down to the nitty gritty, though, it doesn't have anything that
xen doesn't. All that VMware has is the point and click UI ...
jch
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