Service manual

3-54 AlphaServer GS80/160/320 Service Manual
Example 3–29 for the display of the show_status command related to
sys_exer.
Example 3– 35 Exer
P00>>> exer dk*.* -p 0 –secs 36000
P00>>> exer –l 2 dkb0
P00>>> exer –sb 1 –eb 3 –bc 4 –a ‘w’ –d1 ‘0x5a’ dka100
P00>>> exer –a ‘?r-w-Rc’ dka400
Read all 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.
Read block number 0 and 1 from device dkb0.
Write hex 5a’s to every byte of blocks 1, 2, and 3 of dka100. The packet
size is bc (block count) times bs (block size), or 4 times 512, or 2048 for all
writes.
A nondestructive write test with packet size of 512 bytes. The action
string specifies the following sequence of operations:
1. Set the current address to the beginning of a random block.
2. From the beginning of the block, read 512 bytes into buffer1.
3. Set the address back to the beginning of the block.
4. Write the data from buffer1 back to the block on the disk.
5. Set the address back to the beginning of the block again.
6. From the beginning of the block, read 512 bytes into buffer2.
7. Compare buffer1 with buffer2 and report any discrepancies.
8. Repeat the above steps until each block on the disk has been written
once and read twice.
The exer command exercises one or more devices by performing specified read,
write, and compare operations.