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C
9: P
HAPTER
ERFORMANCE
M
ONITORING
To view the I/O Performance graphs:
1 Log in to the Web interface.
2 Select Performance -> Graphs in the Navigation Tree.
3 Select I/O Performance Graphs from the available graph types. Select one
of the three available time periods, Daily, Weekly, or Monthly, by clicking
the appropriate radio button.
4 Click OK.
The I/O Performance graphs show the following information, which is
updated every 5 minutes:
Disk Activity (sec
I
The average number of disk operations per second to the caching
disk(s).
Network Packets (sec
I
The average number per second of TCP packets sent to and received
by the Webcache.
New TCP Connection (sec
I
The average number per second of TCP connections established by
the Webcache.
DNS Lookups (sec
I
The average number per second of Domain Name System (DNS) server
requests sent to the Webcache.
DNS Hit Rate (%)
I
The average percentage of Domain Name System (DNS) server
requests served by the Webcache. This is calculated as the ratio of
host database hits to host database requests.
The Webcache has its own internal cache of DNS entries. The DNS Hit
Rate shows how effective this cache is being in avoiding DNS lookups to
the DNS server.
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