Download SnapSAN 3000/5000 Disk Array User Guide

SnapSAN 3000/5000 Disk Array User Guide
Function Overview
Filename
Description
Disk Array Name
This is the name of the disk array. Statistic information
history files are created for each disk array.
nnn
This is a file serial number (between 2 and 999). If a file with
the same name exists when accumulation of statistic
information starts up, a serial number is assigned. For
example, if the iSM server is shut down and started up in
operation of one day, the serial number is assigned to
accumulated statistic information from the second startup of
the iSM server, and the value increments by one. The serial
number has the upper limit. If the number exceeds this limit,
accumulation of statistic information fails.
If an operation that results in the serial number exceeding the maximum is performed,
move the statistic information history files to the different directory at each shutdown of the
iSM server, or summarize/extract statistic information as required, delete the statistic
information history files. Then, restart the iSM server.
For information on how to estimate the size of a statistic information history file, refer to
Appendix E “Estimating Size of Files for Performance Monitoring Function”.
The accumulating period of statistic information is called the logging interval. The user can
specify the logging Interval from 1 minute to 60 minutes at environment definition of the
iSM server. The logging Interval cannot be changed while the iSM server is operating. To
change the logging Interval, you must terminate the iSM server.
The accumulating processes of statistic information limits the number of times for collecting
statistic information within a specified time, in order not to affect I/O process from the
application server. In other words, the statistic information is not collected all at once from
the disk array, but it is collected with dividing the accumulating process into several
intervals. Therefore, too many disk array components may prevent collecting statistic
information within a specified logging interval, and may disable starting of the data
accumulation process. In such a case, specifying the automatic adjustment of logging
interval in the environment definition of the iSM server can adjust the appropriate intervals
within a range of 60 minutes from the interval set in the environment definition, and start
accumulating processes. When a logging interval is automatically adjusted, a message
notifies the adjustment.
NOTE: Effect of statistic information collection on storage units. When it is determined that there
area many disk array components and the number of times for collecting statistic
information is a lot, message iSM08051 is displayed. If this message is displayed, make a
logging interval longer.
The monitored disk arrays collect various types of statistic information by component/load
type in the unit of summarizing. From the statistic information, iSM reads the statistic
information of the types shown in Tables A-3 to A-11 in A 3.1 and accumulates the time
changes in the statistic information history file. Such statistic information is called basic
statistic information.
The information output on a specific resource basis is called additional statistic information,
and is described in the form of “resource-name (additional-information).”
iSM also records information required for displaying the following information in the
statistic information history file.
10400386-001 07/2012
•
Component information required interpreting accumulated statistic information
•
Name tags used for displaying the results of analysis
©2012 Overland Storage, Inc.
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