I'm wondering if the AMI MegaRAID controller/driver might be the
reason that I'm getting a large number of clock resets from ntpd.
About every half hour, ntpd seems to feel the need to reset the clock
on the server by about 1/3 of a second. The server has a moderate NFS
load (going out through 12 dc interfaces) and an AMI MegaRAID 1400
controller with 8 disks in a RAID-5 config.
I have other servers with 12 dc ports, and havn't seen any
particularly bad time performance from them, which is why I'm
suspicious of the megaraid. This machine is also using a motherboard
common to many of our other machines. None of our other servers (we
have a "ring" of 5 time servers to which all our internal hosts
connect) or clients appear to have any issues.
I have considered setting the option on ntpd to only adjust time by
adjusting the frequency ... to see if this is just a bogon clock chip
or somesuch.
ideas?
Dave.
--
============================================================================
|David Gilbert, Velocet Communications. | Two things can only be |
|Mail: [EMAIL PROTECTED] | equal if and only if they |
|http://www.velocet.net/~dgilbert | are precisely opposite. |
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