or you can clear the snapmirror snapshot within the volume to remove the relationship.

-- Daniel Leeds Senior Systems Administrator Edmunds.com

-----Original Message----- From: Kleinbrahm, Robert [mailto:rkleinbrahm@firstrepublic.com] Sent: Fri 4/27/2007 1:03 PM To: Suresh Rajagopalan; Leeds, Daniel; toasters@mathworks.com Subject: RE: Data migration

I had the same thing happen to me. Solution is to turn snapmirror off on both the source and destination before mounting the lun.

Netapps response on this.

1. Turn off SnapMirror on source filers

2. Turn off SanpMirror on destination filers.

Snapmirror no longer detects a previously SnapMirrored relationship.

When connecting to that LUN, the mounting process takes very little time.

This worked for me and is quite fast.

Bob K.

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From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Suresh Rajagopalan Sent: Friday, April 27, 2007 12:05 PM To: Leeds, Daniel; toasters@mathworks.com Subject: RE: Data migration

OK I tried these steps with a small 20g volume. Unmount the source lun, do final snapmirror update, break mirror, set fs_size_fixed on. Now When I try to connect the new lun via snapdrive on the destination, I get (after the prompt for SFSR) the following error message:

Unable to connect disk

Failure in checking policies

Error: unable to find a snapshot containing a consistent virtual disk to restore

This happens on both snapdrive 4.1 and 3.1.1R1. What am I missing?

Thanks

Suresh

________________________________

From: Leeds, Daniel [mailto:dleeds@edmunds.com] Sent: Thursday, April 26, 2007 3:26 PM To: Suresh Rajagopalan; toasters@mathworks.com Subject: RE: Data migration

snapmirror is what you want. you can set it up anytime prior to the migration and let it run on a schedule or manually to build the initial baseline. after that you just do a snapmirror update to keep it in sync.

we have done this so many times it's second nature. quite simply:

1) create target volume and initialize snapmirror relationship to source while lun is live and serving data 2) setup maintenance window and take filesystem/lun offline 3) perform final snapmirror update 4) break snapmirror relationship and bring new lun/volume online 5) mount new lun/filesystem and serve up data

snapmirror is a really handy product :)

-- Daniel Leeds Senior Systems Administrator Edmunds.com

-----Original Message----- From: owner-toasters@mathworks.com on behalf of Suresh Rajagopalan Sent: Thu 4/26/2007 3:02 PM To: toasters@mathworks.com Subject: Data migration

I need to migrate a 1.4Tb lun from one filer to another with minimal downtime (< 30 mins). So clearly some copying of data has to be done prior to the actual move.

Would snapmirror or flexclone be the most appropriate for this? I'm not sure how I would get a consistent copy of the lun over to the other filer. This is not a database, the lun contains flat files on NTFS.

Thanks

Suresh

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