HP 3PAR System Reporter Software - Manual (Page 166)

6.14 Performance Reports
3PAR System Reporter User’s Guide System Reporter 2.8
6.3.3 Node Cache Performance Reports
Table 6-7 describes the metrics that are shown for Node Cache Performance Reports.
Table 6-7. Node Cache Performance Report Metrics
Metric Description
Read Hits Number of reads that hit in the cache.
Read Misses Number of reads that miss in the cache.
Read Total Total number of reads. Not shown in charts.
Write Hits Number of writes for which the page is already in cache AND is
dirty (i.e., has previously written data that has not yet been flushed
to disk).
Write Misses Number of writes that miss in the cache. A write is considered a
miss if the page is not in the cache or if the page is not dirty in the
cache (see above).
Write Total Total number of writes. Not shown in charts.
Read Hit% Percentage of reads (out of total reads) that hit in the cache.
Write Hit% Percentage of write (out of total writes) that hit in the cache.
Total Total number of accesses (reads + writes). Not shown in charts.
Lock Blocks Number of locked blocks.
Free Free space for the cache.
Clean Number of clean cache pages (valid data on page).
Write1 Number of dirty pages that have been modified exactly 1 time. A
page is dirty when it has been modified in cache but not written to
disk.
WriteN Number of dirty pages that have been modified more than 1 time.