Specifications

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Cisco Unified Communications Manager Managed Services Guide, Release 8.0(1)
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Chapter 8 Industry-Standard Management Information Base
HOST-RESOURCES-MIB
Frequent Asked Questions
Can the HOST-RESOURCES-MIB be used for process monitoring?
Host resources MIB does retrieve the information about the processes running on the system in
hrSwRunTable. But this monitors all the processes running in the system. If you need to monitor only
the installed Cisco Application, then the best way is to use SYSAPPL-MIB.
How is the memory usage values shown by RTMT mapped to the HOST-RESOURCES-MIB?
Table 8-5 lists the memory usage values.
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.
Ta b l e 8-5 Memory Usage Values
Memory Usages RTMT Counter HOST-RESOURCES-MIB
SWAP memory Usage Memory\Used Swap Kbytes hrStorageUsed.2 (whose description is Virtual Memory)
Physical Memory Usage Memory\Used Kbytes hrStorageUsed.1(whose description is Physical RAM)
Total memory (physical +
swap) usage
Memory\Used VM Kbytes 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.
It's unfortunate that RTMT and HR use the term "Virtual
memory" differently but that's what we have to work with.
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)