OIDs for harddisk partitions keeps on changing in net-snmp.

eyemole80 · 02-11-2010, 10:35 AM

Hi,
I am using Ubuntu 8.04.3 LTS/32 bit on Intel(R) Pentium(R) D CPU 2.80GHz.

Net-SNMP version installed =>
aptitude show snmp
Package: snmp
State: installed
Automatically installed: yes
Version: 5.4.1~dfsg-4ubuntu4.2
Priority: optional
Section: net

Problem is: I am using cacti to monitor my some of the system activities including the disk reads and writes. I am using snmp OIDs to determine that.
Also I reboot my system occasionaly ( to save energy when no need

).
I found that after some reboots I cannot see the data on disk read/write graphs. Upon investigation I found that OID of the disk partitions gets change. This is internal fixed HDD.

I was using this OID .1.3.6.1.4.1.2021.13.15.1.1.12.17 for my /dev/sda3 partition to get the data to be graphed in cacti and it was working fine and gives me diskIONReadX information

But now I am getting this information for /dev/sda3 on .1.3.6.1.4.1.2021.13.15.1.1.12.21 OID (last two digits are changed)

This is very weired. Can anyone tell what exactly is the problem.

rweaver · 02-11-2010, 11:04 AM

That's rather strange, have you updated your bios or net-snmp between the reboots and how is your fstab/grub referencing the drives (uuid or dev)?

eyemole80 · 03-10-2010, 06:33 AM

Sorry , I didn't notice this thread , as I got busy with other stuff.
Grub and Fstab are referencing the partitions as UUID.
But how does it matter ? I don't think snmp has anything to do with "how grub looks at disks"?