Very slow while dumping remote tar to local tape drive

[Bonny Jose_1]

Hi experts,
I am using following command to take backup of remote linux machine to the local HP-UX Dat drive.
#remsh linux1 "cd /home;tar -cvf - filename"|dd of=/dev/rmt/0m

Even though the command is working,It is very slow.If I copy the remote file to local hardisk it is very fast and also if I tar a local file to local dat drive it is fast.
I dont understand where will be the problem.
Could somebody help
Thanks
Bonny

[Stefan Farrelly · Accepted solution]

There was a long discussion about the same thing recently. Read it all;

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x1b7842308663d611abdb0090277a778c,00.html

Basically its to do with blocking/buffering over the network when using remote copies like this. Solution is in the above link.

[Steve Steel]

Hi

Try it the other way around as I always find it quicker


On the linux

tar cvf - filename | remsh hp -l user "cat - | dd of=/dev/rmt/0m bs=10k"


At least play with the bs of dd

Steve Steel