Cisco MCS-7825-H3-IPC1 Service Guide - Page 908

HOST-RESOURCES-MIB Chapter 8 Industry-Standard Management Information Base 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 lists the memory usage values. Table 8-5 Memory Usage Values Memory Usages SWAP memory Usage Physical Memory Usage Total memory (physical + swap) usage RTMT Counter Memory\Used Swap Kbytes Memory\Used Kbytes Memory\Used VM Kbytes 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) 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. 8-104 Cisco Unified Communications Manager Managed Services Guide OL-22523-01