[NTLUG:Discuss] NFS & Mirrordir times

[David Simmons]

(if you've been following - I've got two machines connected through NFS that
I want to backup to each other).

Through a VPN link with NFS mounted drives - I've had an interesting
experience that I was hoping someone could help/improve.

I've got two (approx) 3.5 partitions that I was backing up between systems.
Using MirrorDir - it took quite awhile to 'mirror/copy' the first.  As a
test, I created a file on the original server "test.txt" and stuck it deep
in the directory tree - then started the mirrordir command again.  Here's
the interesting results:

Time to complete the 'syncing' to find new extra file:

real		521m40.055s
user		0m1.390s
sys		0m14.200s

Now - time to complete the copying of the second 3.5G of data to create base
copy:

real		754m48.996s
user		0m2.280s
sys		1m40.100s

Here's my mount command:

mount 192.168.1.200:/var/DIRECTORY /mnt/OTHER_DIRECTORY -t nfs -o
ro,rsize=8192,wsize=8192,noatime,sync

I've included 'noatime' and increased rsize & wsizes....is the 'sync' option
what's causing the lengthy times just to read through the directory - or is
that 'just as fast as it goes'(tm).

BTW.  Am on DSL with 1.5 down/768 up

Any ideas for optimization?

Thanks in advance - Dave