Hi all

this mail to let you know about my experience :

i used ndmpcopy (unix/linux utility) from a linux machine to start the ndmpcopy operation on a single head
head : F740 DOT 613r2
data : around 200 Giga

it takes roughlty 13 hours to make a level 0 ndmp copy
in sysstat we were able to see :
net in 5000KB/s net out 5000KB/s and CPU beetween 90 and 100% at most active moments

so here are my conclusions :
- ndmpcopy on a single head consume lot of CPU
- ndmpcopy use the loopback device and is limited to 36G/hr
- as the flow is in + out on a single head , there is an overall copy of 15G/hr
- using two head can improve the time to copy as CPU would be less solicited (as disks) and NIC better used (full 36G/hr at least)

* my wish would be to test an ndmpcopy throught two Giga interface plugged in the same Filer,
i am pretty sure we can get better time in this configuration
i am still waiting for this ocasion
asa I can test this , i will let you know that

Lance R Bailey wrote:

Q: permit me to ask again; does the ndmpcopy process (on the same
 head) use the loopback to do that or does it use the normal NIC ?


my experience is that it uses the nic. i'd *love* to be told how to get
it to stay on the bus and use the loopback...

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