Silicon Graphics CHALLENGE RAID Owner's Manual page 122

Appendix B: The raid5 Command Line Interface
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Table B-3 (continued)
Entry
Low Watermark
High Watermark
SP A Cache Pages
SP B Cache Pages
Unassigned Cache Pages Number of dirty cache pages not owned by A or B. This
Read Hit Ratio
Write Hit Ratio
Prct Dirty Cache Pages
Prct Cache Pages Owned Percentage of cache pages owned by this controller
Prct Read Flushes
Prct Write Flushes
Output of raid5 getcache
Meaning
Percentage of dirty cache pages that, when reached
during flush operations, will cause the SP to cease
flushing the cache.
Valid values are 0 through 100; the default is 50,
regardless of whether caching is enabled or disabled.
Percentage of dirty cache pages which, when reached
during flush operations, will cause the SP to cease
flushing the cache.
Valid values are 0 through 100; the setting must be
greater than the low watermark. The default is 75,
regardless of whether caching is enabled or disabled.
Number of cache pages currently owned by SP A
Number of cache pages currently owned by SP B
can happen when a unit is broken and there are no disks
to which to flush the dirty pages
Percent of read requests to the SP that can be satisfied
from the cache without requiring disk access
Percent of write requests to the controller that can be
satisfied with the cache without requiring disk access
Percentage of cache pages that this SP owns that are
dirty
when pages from other SP are taken into account
Percentage of reads to SP that caused the cache to flush
a page(s)
Percentage of writes to SP that caused the cache to flush
a page(s)