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:

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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

Yes but recreating your qtrees is easy

for Dir in `ls` do rsh ${filername} "qtree create /vol/vol1/${Dir}" echo "/vol/vol1/${Dir} tree 100M" >> /mnt/etc/quotas done

I have made the following assumptions. You have set the variable ${filername} to the name of your new filer. That you have mounted the root volume of the new filer to /mnt and that the quota trees will be created on volume one, vol1. Make the appropriate updates. Once you have created the quota trees, any form of data transfer will work. When you are finished, update the quota sizes and then turn off and on the quota trees. This is a little simplistic, but this is generally how I transferred ~15,000 home directories into quota trees. As most of our home directories were small, gtar worked well for transferring data between filers and I simply included that in the loop after the echo statement.

-gdg

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...

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