While this is true, it is a block for block copy which is why you still have to have at least the same # of blocks on the destination as you have on the source.
-- Adam Fox NetApp Professional Services, NC adamfox@netapp.com
-----Original Message----- From: Mike Federwisch [mailto:mikef@netapp.com] Sent: Monday, July 30, 2001 7:38 PM To: Jeffrey Krueger Cc: Knight, Jason; 'Kelly McQuarrie'; toasters@mathworks.com Subject: Re: snapmirror volume sizes
Actually, volcopy and snapmirror only transfer the used blocks. Unused blocks are not transferred. As and exercise, create a large volume with nothing in it. volcopy it to another volume and since the source has little data, you will notice that the transfer is very short even though the volume is large.
Mike Federwisch
Really would be cool if volcopy and snapmirror could
differentiate between
used and un-used blocks and not require the copy of the
un-used ones. =)
Actually, it would be more than cool. It would be very cool.
-- Jeff
On Mon, Jul 30, 2001 at 04:24:20PM -0500, Knight, Jason wrote:
Kelly,
You are correct. Same size volumes.
NDMPCOPY is a way to achieve the goal, it is a utility
available on NOW and
it basically does a backup of one filer and restore to
another (or the same
filer) concurrently.
Jason Knight
-----Original Message----- From: Kelly McQuarrie [mailto:kellym@sd.us.am.ericsson.se] Sent: Monday, July 30, 2001 3:32 PM To: toasters@mathworks.com Subject: snapmirror volume sizes
Hello all:
I think I know that answer to this one but I figured I
would put it out here
just to make sure I'm right.
I wanted to use snapmirror to migrate a volume to a
different filer. This
volume is 225Gigs but it only has 68Gigs of data on it.
If I'm to use
snapmirror to do this then I need to migrate it to a
225Gig volume correct?
I wanted to shrink the volume while I was at it so I'm
thinking I'm going to
have to do it another way.
Has anybody had experience with this?
Thx
Kelly McQuarrie Unix System Administrator Ericsson CDMA Systems
-
Fox, Adam