HP 3PAR System Reporter E-Media Kit, System Reporter Media Kit 6.3.3 Node Cache Performance Reports

3PAR System Reporter User’s Guide System Reporter 2.8

6.3.3 Node Cache Performance Reports

Table 6-7describes 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.

6.14 Performance Reports