HP StoreEver TapeAssure Software - Manual (Page 48)

NOTE: The gauges in the Disc Capacity section of the screen show the amount of disk space
required for the System Performance test using the current settings, and the amount of space
available in the indicated file system. If the required space exceeds the available space, the
Test Size gauge displays OVERFLOW, and you will be unable to start the test.
4. Click Start to perform the test.
Performing the System Performance Read Performance Test
This test reads data from up to four separate locations on the file system. The reads are concurrent
and simulate up to four concurrent backup data streams. The performance of these reads is measured
and reported in the bottom right of the Test/Utilities sceen. Use this test to measure the performance
of the file system to be used for backup. Use this test in conjunction with the Drive Performance
Test to identify performance bottlenecks in the system. This test is read-only and can be safely run
on backup source data.
NOTE: In the following procedure, a suggested starting value is given for each parameter. These
are not necessarily default values, but they are general values that will result in a simple,
representative test. Use them as a starting point, and modify them according to your needs.
1. Click System Performance Test on the left navigation pane. A service must be added before
System Performance Test can be selected.
2. Click the Backup Pre-Test tab.
3. Specify the following parameters:
•
Read Size — Enter the maximum block size (in bytes) to transfer (suggested starting
value is 512K).
•
Directory Traverse Method — Specify one of the following options (suggested
starting value is depth):
◦ Specify Depth to have the test read as far down the directory structure as possible
before moving laterally to the next directory.
◦ Specify Breadth to read all directories at the same level before moving down to
the next subdirectory level.
•
Stop After — Specify a time limit for the test, or select “All Readers Complete” to
continue testing until the test is complete (suggested starting value is 5 minutes).
•
Reader [1-4] — Enter up to four target directories from which the test will read data.
For each Reader, you must have first performed a Restore Pre-Test. Use the same directory
or directories that you specified in the Restore Pre-Tests.
The number of readers to use depends on your backup application. If the application
uses concurrent read streams, then select multiple readers. To guarantee an accurate
measure of the access rate of the real data, point each reader at the data that each stream
will back up.
•
Read Files — Specifies whether the files must be read back from the tape after the
write completes (suggested starting value is to select this option).
•
Measure Reader 1 compression ratio — When this box is checked, the
compression ratio of the files selected by Reader 1 is measured. When checked, the
normal Backup Pre-Test is not run and the other readers are disabled, while the
compression ratio is measured for Reader 1. When the test completes, the compression
ratio for the files read by Reader 1 will be displayed in the System Performance Results
tab.
IMPORTANT: This is a slow operation.
48 Tests and utilities