One other nice feature of the ndmpcopy utility is that it allows you to run a level zero and then a level 1 once services have been shut off on the source filer. This makes for a nice almost-no interrupt transition from one system to another. One last feature to brag about is that you can ndmpcopy by tree or directory or subdirectory.
Mike Smith Escalations Jerk
----- Original Message ----- From: "Stephen Manley" stephen@netapp.com To: "Jeff Kennedy" jlkennedy@amcc.com Cc: jasf@lanl.gov; toasters@mathworks.com Sent: Friday, April 06, 2001 4:44 PM Subject: Re: Data Copy from Filer to Filer
Hi Jessica,
I'm curious why you would think filesystem fragmentation would prevent the use of NDMPcopy?
NDMPcopy, by its nature, acts as a natural file system defragmenter -- that is, the system that is the destination of the NDMPcopy has pretty much an ideal file system layout for performance.
And because the NDMPcopy data stream generator is integrated into the filer, it should be able to read a fragmented file system better than rsync...
Is your experience different than my theory, or am I missing something blindingly obvious?
Stephen Manley DAM and NDMP Circus Clown
I would imagine the most efficient method is to use snapmirror. However, if you have the problem I do which is wanting to copy specific data from one volume to another you use something like ndmpcopy. My particular case is special and ndmpcopy doesn't work for me either due to filesystem fragmentation so rsync is my only option.
~JK
Jessica Fernandez wrote:
What are your recommendations of copying data from one filer to another?
I have estimated time of 28 hours to transfer 70 GB via a copy command on the host machine.
I have tried to copy via CIFS accessing from NT servers using drag and drop. Encountered errors which halted the copy process due to files that were linked to incorrect locations. Unix files in the users desktop were linked to other machines and the path was invalid. Did a grep to locate these linked files in the user folders, and found too many to change one by one.
The vol copy command is only useful when copying from volume to volume on the same filer, correct?
I am looking for the most efficient way to move data.
Any suggestions would be great!
JessicaJESSICA A. S. FERNANDEZ ESA-FM Facility Management E-mail: jasf@lanl.gov TA-16-661-101, MS-C933 Voice: 505-665-8051 Los Alamos National Laboratory Pager: 104-6707 Los Alamos, New Mexico 87545 FAX: 505-665-9490
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Jeff Kennedy Unix Administrator AMCC jlkennedy@amcc.com