Compaq ES40CSLP, Installation, User & Service Manual

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Troubleshooting and Diagnostics
6–30 Compaq ES40CSLP Rackmount System Installation/User/Service Guide
-a <action_string> Specifies an exerciser “action string,” which determines the sequence of
reads, writes, and compares to various buffers. The default action string is
?r. The action string characters are:
•
r – Read into buffer1.
•
w – Write from buffer1.
•
R – Read into buffer2.
•
W – Write from buffer2.
•
n – Write without lock from buffer1.
•
N – Write without lock from buffer2.
•
c – Compare buffer1 with buffer2.
•
- – Seek to file offset prior to last read or write.
•
? – Seek to a random block offset within the specified range of
blocks. Exer calls the program, random, to “deal” each of a
set of numbers once. Exer chooses a set that is a power of
two and is greater than or equal to the block range. Each call
to random results in a number that is then mapped to the set
of numbers that are in the block range and exer seeks to that
location in the filestream. Since exer starts with the same
random number seed, the set of random numbers generated
is always over the same set of block range numbers.
•
s – Sleep for a number of milliseconds specified by the delay
qualifier. If no delay is present, sleep for 1 millisecond.
– NOTE: Times as reported in verbose mode are not necessarily
accurate when this action character is used.
•
z – Zero buffer 1
•
Z – Zero buffer 2
•
b – Add constant to buffer 1
•
B – Add constant to buffer 2
-sec <seconds> Specifies to terminate the exercise after the number of seconds have
elapsed. By default the exerciser continues until the specified number of
blocks or passcount are processed.
-m Specifies metrics mode. At the end of the exerciser a total throughput line is
displayed.
-v Specifies verbose mode. Data read is also written to stdout. This is not
applicable on writes or compares. The default is verbose mode off.
-delay <millisecs> Specifies the number of milliseconds to delay when “s” appears as a
character in the action string.
Example Sequence
>>>exer du*.* dk*.* -p 0 –secs 36000
Read all DSSI and SCSI type disks for the entire length of each disk. Repeat this until 36000
seconds, 10 hours, have elapsed. All disks will be read concurrently. Each block read will occur
at a random block number on each disk.