Matt Zimmerman wrote:

EVMS supports writable snapshots, using copy-on-write from an EVMS volume.
I haven't tried it with read-only DASD, but in theory it should be possible
for it to be used this way.  The act of creating the snapshot might require
writing to the original volume in order to update the volume metadata.


I thought this was done by keeping the dirty data in page cache until
the moment where you open the flood gates again after you did the backup
of a consistent not-changing device?

Rob

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