User manual

Chapter 3: CacheRaQ 4 Administration
48 Cobalt CacheRaQ 4 User Manual
Software on the CacheRaQ 4 rotates the access.log and cache.log files once per
day. Log files are saved until they exceed the disk space allocation for log files. At
this point, old log files are deleted until disk space consumption is within the
specified limit.
The Cache Logs screen offers two options: View Logs, for viewing the current
day’s log files and Download Logs, for downloading log files from previous
days.
• View Log Files. This page lets you select a log file (access.log or cache.log)
and enter a number of lines (N). It then displays the most recent N lines of
the selected log file. This is useful for diagnosing any immediate problems
(by viewing cache.log) and for examining current client activity (by viewing
access.log).
• Download Log Files. This page lets you download entire log files on a daily
basis—it lists all the available access.log and cache.log files from previous
days. To download a log file through your browser, shift-click the filename.
You can also click a file to view it but keep in mind that these files
(particularly access.log) can be quite large and therefore may be
cumbersome to display in a Web browser.
Network usage
The Network Usage screen shows statistics for network packets sent and received
on the CacheRaQ 4’s two network interfaces; see Figure 24. If an interface is not
used, the statistics are displayed as “0” for that interface.
Packets are counted in the following categories:
• Good. A packet was received or sent without error.
• Error. A send or receive error occurred that is not covered by the two
following categories.
• Dropped. A packet was ignored (dropped) by the operating system because
of a temporary lack of buffer memory.
• Collisions. The CacheRaQ 4 attempted to transmit a packet while another
host was in the process of transmitting a packet. A high rate of collisions
relative to packets sent indicates a potentially overloaded network.