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Re: [linux-lvm] Snapshots and disk re-use



On 2/24/2011 1:15 PM, Nataraj wrote:

One other thing that wasn't mentioned here.... As far as I understand,
if these are lvms on the host and the snapshots are being taken on the
host, there is no guaranteed integrity of the filesystems unless you
shutdown the guest while the snapshot is taken.

It's too bad they don't implement a system call that could do something
like sync filesystem and sleep until I tell you to continue.  This would
be perfect for snapshot backups of virtual hosts.

Syncing a filesystem's OS buffers isn't really enough to ensure that running apps have saved their data in a consistent state. The best you are going to get without shuting things down is more or less what you'd have if the server crashed at some point in time.

--
  Les Mikesell
   lesmikesell gmail com


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