Stephen,
Actually it was me that had the problem with ndmpcopy....
Problem: File system was fragmented due to manner in which addition of disks was done. We would add 1 or 2 at a time over the last 2 years. It got to the point where backups were kicked off but it would be 3+ hours before it would write to tape.
ndmpcopy: When I attempted to use ndmpcopy to split this volume up I got the same write delay and a transfer rate of 1gb/hr. Yes, that's ONE GB per HOUR. So, 156 hours later........ Not a chance.
Hmmm... What version of Ontap were you using?
Specifically, was it pre-5.3.4? Was it pre-6.0?
Second, I'm guessing you had the checksum code enabled?
Third, I assume the "time before writing" was Pass I and II of dump -- mapping phases?
A NetApp SE was onsite to witness this and had no idea why it was doing this. Finally settled on rsync. Do you have any idea why it would do this?
I may have a theory, depending on your answers to the questions above.
Sorry I confused you with Jessica. I'd make an excuse about your names starting with the same letter, but I should know better. After all, I expect people to keep all million Stephen/Steven/Steves running around NetApp straight. :)
Sorry, Stephen Manley DAM and NDMP Stephen