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Re: [linux-lvm] kernel: zam-7001: io error in reiserfs_find_entry



On Fri, Jan 11, 2002 at 09:32:47AM -0800, Stephenson, Dale wrote:
> Patrick Caulfield wrote:
> > On Fri, Jan 11, 2002 at 11:47:37AM +0100, Thomas Ziegler wrote:
> [snip]
> > > - Is there a way to get the snapshot not destroyed if it is 
> > getting full?
> > 
> > No. Once the snapshot is full then it can't be valid because 
> > there may be
> > blocks written to the original device that the snapshot can't 
> > backup. The only
> > way aoud this is to make your snapshots large enough to hold 
> > all the data that
> > is going to change on the original device during the backup.
> > 
> If it isn't full yet, is there any reason you couldn't just do an lvextend
> on the snapshot volume?  (This assumes there is space available in the
> volume group for the lvextend.)

Yes you can - you can also use the LV_SNAPSHOT_USE_RATE ioctl call to warn you
when this was happening.

patrick




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