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...