[PVE-User] qcow2 "snapshot": are they feasible/planned?

Damiano Verzulli damiano at verzulli.it
Tue Jan 3 12:53:18 CET 2012

Hash: SHA1

Il 03/01/2012 10:52, Dietmar Maurer ha scritto:
>> [...]
>> - From my point of view (am I wrong?) is much better to "stop" the machine for
>> a few seconds, "snapshot everything", "un-stop" the machine.
> Restoring a vzdump backup is really easy - I never had any problems with that.

Good to see that you "...never had any problems with that...". Have you
tried to "vzdump" a system running a busy DB server (MySQL / Oracle /
SQL-Server) and, afterward, restoring it?
Have you had any issues? I'm really interested.

I really think that, in case of DB, the only two "guarranted" ways to use
vzdump are:

1 => Stop MySQL Server; vzdump; restart MySQL;

2 => Dump MySQL DBs; vzdump.

Both solutions are "safe" but only regarding MySQL. Solution 2 can be
time-consuming, depending on the size of DBs.
What about other processes that store important data "in memory"?

It looks to me that in both case, restoring from previous vzdump will lead
to a "corrupted" file-system, requiring an FSCK (at least).

Am I wrong?

To avoid such a behaviour I'm forced to:

3 => Shutdown GestOS; vzdump; Restart GuestOS

But this is exactly what I'd like to avoid.

Am I wrong?


> For me this looks like you want to solve a problem which does not exist.

Such a phrase sounds a bit.... bad. So I simply... didn't read it ;-)

- -- 
Damiano Verzulli
e-mail: damiano at verzulli.it
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"Technical people tend to fall into two categories: Specialists
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less about a wider and wider field, until eventually he knows
nothing about everything." - William Stucke - AfrISPA
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