Multiple snapshot problem.

[Doug Hughes]

>Richard et al,
>
>Sorry to push a product on this alias (even if it is a Sun one :-)
>but you might want to have a look at Solaris Instant Image,
>announced yesterday.  It's independent of Volume Mgr, from memory:
>
>Allows more flexible snapshots, including between different
>disk groups, refresh in either direction, both copies are
>read/write, either full independent copies which both have
>all the data or dependent copies where the copy only contains
>the original values of the changed blocks, and defers to the
>master for unchanged blocks (the latter can't be moved to
>another host system though, and if when the former is moved
>you do lose the fast refresh option as you lose bitmap sync).
>
>It may meet your need, saves mucking around with multiple
>snapshot volumes and/or disassembling diskgroups etc.
>
>No idea what it costs in your part of the world though;
>licensing is based on system size (<E3000, E3000-E5500,
>E6x00, E1000; I can't get to the announcement at the moment).
>
>As to your original question, I haven't played with multiple
>snapshots to know which gets chosen when etc.  [Mike??]
>

That sounds remarkably like the VxFS snapshot capability. Does it work
with VxFS filesystems? Is it a filesystem type snapshot or a volume
type snapshot?

Of course, we have yet to have the VxFS snapshot capability completely
work for us... (in all versions since 3.2.1)

It sounds good. I wouldn't be adverse to a 1-2 screen blurb detailing the
features of this product and a URL on where to get more info.
I'm sure many list readers would be interested.