Frequently Asked Questions - Cisco MCS-7825-H3-IPC1 Service Manual

HOST-RESOURCES-MIB

Frequently Asked Questions

Can the HOST-RESOURCES-MIB be used for process monitoring?
The HOST RESOURCES MIB retrieves the information about the processes running on the system in
hrSwRunTable, by monitoring all of the processes running in the system. However, to monitor only the
installed Cisco Application, use the SYSAPPL-MIB.
How is the memory usage values shown by RTMT mapped to the HOST-RESOURCES-MIB?
Table 8-5
Table 8-5 Memory Usage Values
Memory Usages
SWAP memory Usage
Physical Memory Usage
Total memory (physical +
swap) usage
Why do the disk space values shown by RTMT and the HOST-RESOURCES-MIB differ?
In general the df size will not match the used and available disk space data shown. This is because of
minfree percentage of reserved filesystem disk blocks. The minfree value for a Cisco Unified
Communication Manager in Releases 6.x and 7.0 systems is 1%. So there will be difference of 1%
between the disk space used value shown in RTMT and HOST-RESOURCES-MIB.
In RTMT, the disk space used value is shown from df reported values: [(Total Space - Available Space)
/Total Space] * 100 where the Total Space includes the minfree also. For the HOST-RESOURCES-MIB,
this is calculated by [hrStorageUsed/hrStorageSize] * 100 wherein the hrStorageSize does not include
the minfree.
Cisco Unified Communications Manager Managed Services Guide
8-104
lists the memory usage values.
RTMT Counter
Memory\Used Swap Kbytes
Memory\Used Kbytes
Memory\Used VM Kbytes
Chapter 8 Industry-Standard Management Information Base
HOST-RESOURCES-MIB
hrStorageUsed.2 (whose description is Virtual Memory)
hrStorageUsed.1(whose description is Physical RAM)
No equivalent. Basically need to add hrStorageUsed.2 and
hrStorageUsed.1
Since swap memory may not be used at all on lightly used
servers, HR Virtual Memory may return 0. To validate HR
VM is returning correctly, that value needs to be
compared against RTMT Memory\Used Swap KBytes.
The hrStorageUsed for physical memory shows the data in
terms of used - (buffers + cache).
The hrStorageUsed for physical memory shows the data
in terms of used that is buffers + cache.
The shared memory info that is exposed by the MIB is
HOST-RESOURCES-MIB::hrStorageDescr.10 =
STRING: /dev/shm. The virtual memory reported by
HOST-RESOURCES-MIB is what is considered as swap
memory by RTMT.
For HOST RESOURCES MIB, the following is used:
• %Physical memory usage = (Physical RAM
hrStorageUsed + /dev/shm hrStorageUsed) /
(Physical RAM hrStorageSize)
%VM used = (Physical RAM hrStorageUsed +
•
/dev/shm hrStorageUsed + Virtual Memory
hrStorageUsed) / (Physical RAM hrStorageSize +
Virtual Memory hrStorageSize)
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