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Coming out of lurk mode for the first time folks. Kit is 810 filer 12x72GB, 2xSun E250 each connected on private fibre 1GB link, legato Networker to DLT7000 drives attached to the Sun (no NDMP). We've moved on from dotHill SANnet.
There's been some discussion I've been following about fast read/slow write (or the reverse). We had our first filer installed in March and whilst performance was OK, backup of 250GB was taking 18 hours or more. Suppliers and NetApp had configured for improved performance but to no effect.
Thanks to the thoughts on the list we changed yesterday from UDP to TCP and backup dropped to 5 hours - the expected performance.
Daft buggers had optimised performance across the fibre for TCP and not UDP! So all the tuning effort done by the engineers had had no effect. FWIW script is appended for anyone's interest.
We're going to get UDP optimised now, because of the reduced overhead - as it is a point to point connection so only the filer and the server are on the fibre.
So many many thanks to the list - saved our bacon!
Peter Bryant
Script is S68net-tune in /etc/rc2.d #!/sbin/sh # /etc/rc2.d/S68net-tune -> /etc/init.d/net-tune #!/sbin/sh PATH=/usr/bin:/usr/sbin case "$1" in 'start') echo "Implementing Solaris Network Tuning." ndd -set /dev/ge instance 0 ndd -set /dev/ge adv_1000autoneg_cap 0 ndd -set /dev/ge adv_1000fdx_cap 1 ndd -set /dev/ge adv_1000hdx_cap 0 ndd -set /dev/ge adv_pauseTX 0 ndd -set /dev/ge adv_pauseRX 0 ndd -set /dev/tcp tcp_recv_hiwat 262144 ndd -set /dev/tcp tcp_xmit_hiwat 262144 ndd -set /dev/tcp tcp_xmit_lowat 2048 ndd -set /dev/tcp tcp_wscale_always 1 ndd -set /dev/tcp tcp_tstamp_always 1 ndd -set /dev/tcp tcp_rexmit_interval_max 60000 ;; 'stop') echo "No kernel parameters changed." ;;
*) echo "Usage: $0 {start|stop}" ;; esac exit 0
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