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Contributor
Posts: 24
Registered: ‎11-28-2005

SNMP Performance monitoring.

I'd like your input on the monitoring of FC ports on the switch via SNMP.

If i want to see if my 4gb connections are maxing out, i thought i would snmpget this:

snmpget -c public -v 2c hostname 1.3.6.1.2.1.2.2.1.10.1073741966
IF-MIB::ifInOctets.1073741966 = Counter32: 2290258800
snmpget -c public -v 2c hostname 1.3.6.1.2.1.2.2.1.16.1073741966
IF-MIB::ifOutOctets.1073741966 = Counter32: 4024598400

This is Port 30 on my switch, for the ifinoctet and ifoutoctet.

IN returns about 2.2gb

OUT returns about 4gb

Is that right?  Does that mean that my 4gb port is badly overused?  Thus creating wait on my host?

Is that a proper value to performance monitor?  Should i monitor something else instead?

Thasnk

Super Contributor
Posts: 260
Registered: ‎04-09-2008

Re: SNMP Performance monitoring.

My friend - I presume you are monitoring a FC switch from brocade and not a ethernet switch.

I'm no expert, but can you try using these objects and lemme know the results.

swFCPortTxWords 1.3.6.1.4.1.1588.2.1.1.1.6.2.1.11


Counts the number of Fibre Channel words that the port has transmitted. You can convert words to bytes
by multiplying this value by 4.


swFCPortRxWords 1.3.6.1.4.1.1588.2.1.1.1.6.2.1.12


Counts the number of Fibre Channel words that the port has received.
You can convert words to bytes by multiplying this value by 4.

Contributor
Posts: 24
Registered: ‎11-28-2005

Re: SNMP Performance monitoring.

HI.

Thanks, but this looks  like an increasing total.  I did a couple of snmpget on a specific OID and it keeps increasing quite a bit...

$ snmpget -c public -v 2c swm48_220_sw0 .1.3.6.1.4.1.1588.2.1.1.1.6.2.1.11.255
SNMPv2-SMI::enterprises.1588.2.1.1.1.6.2.1.11.255 = Counter32: 3930881056
$ snmpget -c public -v 2c swm48_220_sw0 .1.3.6.1.4.1.1588.2.1.1.1.6.2.1.11.255
SNMPv2-SMI::enterprises.1588.2.1.1.1.6.2.1.11.255 = Counter32: 3931636504
$ snmpget -c public -v 2c swm48_220_sw0 .1.3.6.1.4.1.1588.2.1.1.1.6.2.1.11.255
SNMPv2-SMI::enterprises.1588.2.1.1.1.6.2.1.11.255 = Counter32: 3931636504
$ snmpget -c public -v 2c swm48_220_sw0 .1.3.6.1.4.1.1588.2.1.1.1.6.2.1.11.255
SNMPv2-SMI::enterprises.1588.2.1.1.1.6.2.1.11.255 = Counter32: 3932748796
$ snmpget -c public -v 2c swm48_220_sw0 .1.3.6.1.4.1.1588.2.1.1.1.6.2.1.11.255
SNMPv2-SMI::enterprises.1588.2.1.1.1.6.2.1.11.255 = Counter32: 3932988952
$ snmpget -c public -v 2c swm48_220_sw0 .1.3.6.1.4.1.1588.2.1.1.1.6.2.1.11.255
SNMPv2-SMI::enterprises.1588.2.1.1.1.6.2.1.11.255 = Counter32: 3932988952
$ snmpget -c public -v 2c swm48_220_sw0 .1.3.6.1.4.1.1588.2.1.1.1.6.2.1.11.255
SNMPv2-SMI::enterprises.1588.2.1.1.1.6.2.1.11.255 = Counter32: 3937375752
$ snmpget -c public -v 2c swm48_220_sw0 .1.3.6.1.4.1.1588.2.1.1.1.6.2.1.11.255
SNMPv2-SMI::enterprises.1588.2.1.1.1.6.2.1.11.255 = Counter32: 3937375752

I am thinking this is more like a Total transferred since connection or something?

Steph

Super Contributor
Posts: 260
Registered: ‎04-09-2008

Re: SNMP Performance monitoring.

you need to take a difference from consecutive readings and then multiply by 4 to get bytes transferred in the monitoring interval.

I just took your stats and converted it into MB

2.88180542 MB

4.243057251 MB

0.916122437 MB

16.73431396 MB

So not much traffic if I have done this right.

For your device to pump in 4 GB of IO, it must be really powerful & crazy host, something which I have not seen in my life so far. But this can happen if you have a bad over subscription ratio for your ISL's otherwise not.

Meanwhile I found a similar thread for you to refer

http://community.brocade.com/home/thread/3828

Regards,

Biju Krishnan

TechHelp24

Email: bkrishnan@techhelp24.com

Site: www.techhelp24.com



Contributor
Posts: 24
Registered: ‎11-28-2005

Re: SNMP Performance monitoring.

HI.

Thanks.  Once i got your first reply, i did some research and found a post referring to that extent.  I was trying to graph it using Zenoss and the values were so high it made no senses.  I was using the values as a true mesure (gauge) where i should have been using the type Counter instead.  Now using your input, all i need to do is grab that value and multiply it by 4...

Thanks!

Steph

Super Contributor
Posts: 260
Registered: ‎04-09-2008

Re: SNMP Performance monitoring.

Steph,

Kindly close the thread by marking answers as helpful or answered.

Best of luck.

Regards,

Biju Krishnan

TechHelp24

Email: bkrishnan@techhelp24.com

Site: www.techhelp24.com



Super Contributor
Posts: 260
Registered: ‎04-09-2008

Re: SNMP Performance monitoring.

Accidently posted. Cant delete now.

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