watch out with ndmpcopy *made in netapp* :
- only last version of Ontapp deal well with unicode filenames (especially found in ntfs qtrees)
- don't use the option that let you preserve /etc as it doesn't work correctly : it erase some /etc/files if you do so,
then only ndmpcopy to another volume than the /root volume

fanx for the responseanyway,
in fact, i am pretty well aware of good and less of each solution
but i am looking for real performance limit in loopback mode

the probleme is as this :
make ndmpcopy / snapmirror beetween two Giga Filer, you can burst up to 50GB/s
if you do the same on the same Filer (source and dest), you are limited to 10KB/s as if you were using two Filer over 100M

in my previous tries, that what i use to get
Netapp record that as a bug, as the Filer should go faster on disk-to-disk copy than on network copy
unfortunately, for code reason, Netapp hard code this disk-to-disk copy as a network throught loopback copy
and internally, the loopback is limited to 36GB/hr...

you see my point

Steve Losen wrote:

Hi all,

i want to migrate data on a Giga Filer from its old disks to newer 
bigger one

what can i use to get the faster operation knowing that :
- volcopy won't be able to go faster than 36G/hr (as if ths volcopy was 
running over a 100TP link)

I would like to know if any of you know if NDMPCopy or SnapMirror can go 
beyond this 36G limit in a loopback mode (migration from-to the same Filer).

 

If you are trying to minimize downtime, you might prefer to use
ndmpcopy.   You can do a full copy of a snapshot while you leave
the filer up and let users continue to access the old volume.
Even it if takes quite a while to finish, it doesn't matter because
the filer is still available to users.  After the full copy finishes,
do an incremental copy to pick up any changes that the users made
during the full copy.  Then disable user access and do a second
incremental to pick up the changes during the first incremental.
Users will experience a very short downtime, at least compared to
waiting for a full copy to finish.

You can probably do something similar with snapmirror, but we
don't have a license for it, so I've never used it.

Steve Losen   scl@virginia.edu    phone: 434-924-0640

University of Virginia               ITC Unix Support

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