StorageTek Host Software Component 6.0, Руководство системного программиста

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196 VM/HSC 6.0 System Programmer’s Guide
1st ed., 6/30/04 - 312579601
Usage Notes
1. Merging multi-host HSC SMF records impacts the LSM ARM USE statistic as
described above. However, not merging multi-host HSC SMF records affects the
number of pass-thrus reported, as this is only the number of pass-thru operations
occurring during the hosts LMU interval.
2. LSM ARM USE should never be reported higher than 100 percent. If the LSM is
overlapping operations the arm is still only busy for 1 second even though it may be
moving two cartridges during that 1 second time period.
3. The raw SMF record contains counts of pass-thru operations for each master
pass-thru port of an LSM. The ACS section totals this information for its pass-thru
count.
4. The ACS section of the Activities Report only processes the LMU statistics buffer
data block SMF record (subtype 4). LMU statistics buffer records contain
information calculated and returned by the LMU every HSC SMF interval. When
attempting to understand ACS performance it may be worthwhile to decrease the
HSC SMF interval so the HSC SMF records describe finer intervals of time (refer to
‘‘Adding SMF Parameters’’ in the
HSC Installation Guide ).
5. Depending on the 9740 microcode level, 9740 LSMs may display zeroes for LSM
arm use percentage and pass-thru statistics. Additionally, the SLSSLSB SMF record
(refer to “SLSSLSB” on page 513) will contain zeroes in the LMU ATHS Statistics
Buffer entries, and the SLSSLLG6 LOGREC record (refer to “SLSSLLG6” on page
548) will not write robotics motion and soft fail counts for 9740s.
Figure 9 on page 197 is an example of a typical Activities report.
Activities Report