Storage Manager 60-NT Introduction Guide

Tuning Storage Arrays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44 T
UNING STORAGE ARRAYS
Tuning Storage Arrays
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Option Description
6WRUDJH $UUD\ !! 0RQLWRU 3HUIRUPDQFH Use the Performance Monitor to monitor Storage Array
performance in real-time and save performance data to a file for
later analysis. You can specify the volumes and/or controllers to
monitor and the polling interval.
Data provided from a session includes I/O load, cache hit
percentage, how your I/O is allocated between reads and writes,
transfer rates and I/O request rates for the volumes being
monitored or for the entire Storage Array.
– A transfer rate is the amount of data in Kilobytes per second
that moves through the I/O data path (also called throughput).
– An I/O request rate is the average number of I/O requests
serviced per second.
– Cache hit percentage is the percentage of reads that are
serviced with data from the cache rather than requiring a read
from disk.
For more information, see the Array Management Window Help.
6WRUDJH $UUD\ !! &KDQJH &DFKH 6HWWLQJV Use this option to specify the start flush and stop flush
parameters (expressed in percentage of cache memory that
contains unwritten data) and the cache block size for the
Storage Array.
Low start and stop flush percentages increase data safety but
decrease the cache hit percentage and therefore the I/O request
rate.
For more information see "Protect Data in the Controller Cache
Memory" on page 22 and the Array Management Window Help.