Serial over LAN
tim at seoss.co.uk
Fri May 21 04:29:36 CDT 2010
Case van Rij wrote:
> I have this configured on 45 R410s with iDRAC Express and have tried
> it in the past on 50 R210s and a handful of 1950s and I have to say,
> even once configured it's actually rather frustrating to use and it's
> no substitute for a cyclades-like serial console server.
> I initially tried to use this with the ethernet port on my regular
> switch (even though the ethernet port was dedicated to PXE and IPMI,
> all normal traffic is using an add-on 10G card) and the management
> port would simply stop responding to network traffic on a daily basis.
> I've since moved the ethernet to an isolated switch and it's
> marginally better, but the serial-over-LAN is still so unresponsive
> that remote management automation frequently times out while trying to
> manage the server).
I've found performance on R210s to be good. 1950s and PE860s less so.
I've found reliability pretty good using recent ipmitool builds. Here's
how I have an R210 set up (I think these were just the defaults).
# ipmitool sol info 1
Character Accumulate Level (ms) : 50
Character Send Threshold : 255
Retry Count : 7
Retry Interval (ms) : 480
Volatile Bit Rate (kbps) : 115.2
Non-Volatile Bit Rate (kbps) : 115.2
Payload Channel : 1 (0x01)
Payload Port : 623
You may want to try:
1. Using a recent ipmitool, if you're not already.
2. Fiddling with the first 4 values. I'm guessing that things like the
"retry interval" could come down on a LAN - half a second to retry a
dropped packet seems like a long time at first consideration.... It
would perhaps have been nice if IPMI did stuff over TCP rather than UDP,
but when it was defined it didn't to SoL, so I suppose UDP was good
enough, and nice and light-weight for doing other (non-interactive) IPMI
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