HP Surestore Disk Array FC60 Storage Manager 60-NT Introduction Guide - Page 44

Tuning Storage Arrays

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Tuning Storage Arrays Tuning Storage Arrays Option Description 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. 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. 44 TUNING STORAGE ARRAYS

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Tuning Storage Arrays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44
T
UNING
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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.