In message 19990325105303.A7088@avatar.lsd.ornl.gov, mgx@spruce.lsd.ornl.g ov writes:
fwiw, i'm backing up my two F520's via ndmp to a DLT7000 and i'm averaging about 11.7GB/hour.
-- michael
That sounds slow. We're readying an F740 for production and our tests show ~3MB/s (~11GB/hr) over a 110mb full-duplex connection to a Sun "backup server" with a DLT4000 jukebox. That's theoretical max on a DLT4000 and still plenty of room on the network. Haven't tried multiple concurrent dumps yet, so I'm not sure how well that would scale. You should see about triple the throughput to a single DLT7000.
jason
On Thu, Mar 25, Will Harper wrote:
Can I have the users' opinions? The top statement was from an unnamed NetApp 740 filer user. The bottom part is NetApp's rebuttal. I see this
as two questions. (1) can a 740 support two tape adapters? and (2) who i
s
right(er) about NDMP backup speeds on a 740, with one tape drive adapter?
[USER]With a (potentially) 1.4Tb filer, can it be backed up with two drives reasonable amount of time???? At 15gb/hr (conservative with NDMP), that's lots of hours to back em up..."
[NetApp]Two tape adapter support was certified (tested) only on the F760 and the F630. It was a matter of testing resources with our latest release.
Dump speeds run at up to 25 GB/hr with 1 dump and up to 45 GB/hr with two dumps to two tape drives on a single tape adapter.