Patrol warnings

[Hunki]

We disabled SNMP on our servers and are getting these messages lately from Patrol....

MEMORY.MEMORY.MEMWCache; WARNING 01/03/2007 04:08:01 10 <= 19.90 <= 20


Cud this be because we disabled SNMP ...

thanks,

[Hunki]

Is it something to do with the Write cache activity ... how to further investigate...

[spex]

Hunki,

The message is from SNMP trap, which is the result of a parameter alarm. You will need to investigate the cause of the alarm further.

See page 483/668 of the PATROL Reference Manual:
http://documents.bmc.com/supportu/documents/97/27/9727/9727.pdf

PCS

[Hunki]

Yeah I did look into this link ... but there is nothing really conclusive.

thanks.

[spex]

Hunki,

The percentage of logical blocks written to the buffer cache dropped to 19.90%, which set off MEMWCache's alarm2. Unless this happens frequently, it's nothing to be worried about--MEMRCache is a far more important metric. I would decrease the maximum value of the range of your alarms or disable this alarm altogether.

PCS

[Hunki]

Its happening pretty frequently... Need to find out whats causing this ... how to monitor and how to fix it...

thanks,

[Hunki]

Come guys pick up the challenge ...

[Duncan Edmonstone]

Hunki,

Unlikely to be anything to do with SNMP - this message is simply telling you that your write cache hit ratio isn't particularly high - have you got an IO performance problem on this server? If not, who cares - just adjust the alert points in Patrol so it doesn't bother you any more.

If you *really* want to look at this some more then sar -b will give you data on the buffer cache performance. (%wcache in particular relates to what you are looking at)

sar -b 5 50

HTH

Duncan