General speed question

David Arnold dga at
Sun Jun 2 22:07:01 EST 2002

We have some speed/performance issues:

We have a 100M fullduplex private network setup to handle rsync transfers 
to our "mirror" server with a command like:

time rsync -e ssh -avzl --delete --rsync-path=/usr/local/bin/rsync \
	--exclude ".netscape/cache/" --delete-excluded \
	bigserver:/staff1 /mirror/bigserver

It takes about 20 minutes to check/transfer files from 
bigserver:/staff1 (Solaris 8) and the local machine (RH 7.2, 
Linux 2.4.2-2).  bigserver/staff1 is 24G. 

Is that speed fast or slow?  I think it's slow for a 100M fullduplex
private network.  It goes from a private NIC on bigserver to the
hub to a private NIC on the local host - all 100M fullduplex.

The output is showing many directories transferred, although no files 
within the directories are actually being transferred.  Is that

The hub is showing lots of collisions, although there are no
collisions reported on the local box's private NIC :

localhost # ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:02:B3:8B:E4:CE  
	  inet addr:  Bcast:  Mask:
	  RX packets:1601661 errors:0 dropped:0 overruns:0 frame:624536
	  TX packets:1477346 errors:0 dropped:0 overruns:0 carrier:0
	  collisions:0 txqueuelen:100 Interrupt:5 Base address:0xb400 

Anyone know how to display the collisions on a solaris box?

I have also noticed that running tape backups over the private network
(ssh/dd) causes both to slow to a crawl - even though the tape backups 
can only do about 2M a second (DLT IV).

Any suggestions/help appreciated.

David Arnold	     				dga at

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