From: Christian Iseli (chris@ludwig-alpha.unil.ch)
Date: Mon May 06 2002 - 13:31:23 EDT
Hi folks,
I will soon be upgrading an UltraEnterprise 450 machine to Solaris 8 2/02, and
I still have a few nagging doubts...
The machine will have 4 GB RAM, about 1 TB disks, and Gigabit ethernet (Sun
Vector Gigabit Ethernet PCI NIC). It is used mainly as an NFS file server, and
as a web server. The main data partition will be a SDS concat/stripe of about
900 GB. The disks are in the built-in racks, and in three D1000 cabinets.
doubt #1: is the vge driver included in the Solaris 8 2/02 release, and part
of the normal install ?
doubts #2: I have read through the "Solaris Tunable Parameters Reference
Manual", and came to the part on Per-Route Metrics, which explains that for
gigabit ethernet devices, tcp_recv_hiwat should be increased. Question is:
how much ? Also, should tcp_xmit_hiwat be increased as well ?
doubt #3: Am I correct in assuming that tcp_max_buf should be set around
104,857,600 (i.e., 100 times its default value) ?
doubt #4: the machine currently has 1.7 GB RAM and Solaris 2.6 (+ patches).
If I look at vmstat, the sr column appears to stay at 0. Should I then set
dopageflush to 0 ? Or am I better off increasing autoup ?
doubt #5: it sometimes happens in the current setting that a run-away perl
script from the web server eats up all the swap space by filling up /tmp
(mounted from swapfs) and the system pretty much hangs at that point. Is
setting tmpfs:tmpfs_minfree to some megabytes the right way to prevent the
freeze and allow root logins to kill the bad process ? Is the default value
really 256 *bytes* ?
doubt #6: what else am I missing ? ;)
TIA for any help. Will summarize.
Cheers,
Christian
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