Compaq AlphaServer ES40, Service Manual

Page: 121 / 444

SRM Console Diagnostics 4-17
P00>>> ls -l dk*.*
r--- dk 0/0 0 dka0.0.0.0.0
P00>>> exer dk*.* -bc 10 -sec 20 -m -a ’r’
dka0.0.0.0.0 exer completed
packet IOs elapsed idle
8192 3325 27238400 0 166 1360288 20 19
P00>>> exer -eb 64 -bc 4 -a ’?w-Rc’ dka0
A destructive write test over block numbers 0 through 100 on disk dka0. The
packet size is 2048 bytes. The action string specifies the following sequence of
operations:
1. Set the current block address to a random block number on the disk
between 0 and 97. A four block packet starting at block numbers 98, 99, or
100 would access blocks beyond the end of the length to be processed so 97 is
the largest possible starting block address of a packet.
2. Write a packet of hex 5a’s from buffer1 to the current block address.
3. Set the current block address to what it was just prior to the previous write
operation.
4. From the current block address read a packet into buffer2.
5. Compare buffer1 with buffer2 and report any discrepancies.
6. Repeat steps 1 through 5 until enough packets have been written to satisfy
the length requirement of 101 blocks.
P00>>> exer -a ’?r-w-Rc’ dka0
A nondestructive write test with packet sizes of 512 bytes. Use this test only if
the customer has a current backup of any disks being tested. The action string
specifies the following sequence of operations:
1. Set the current block address to a random block number on the disk.
2. From the current block address on the disk, read a packet into buffer1.
3. Set the current block address to the device address where it was just before
the previous read operation occurred.
4. Write the contents of buffer1 back to the current block address.
5. Set the current block address to what it was just prior to the previous write
operation.
6. From the current block address on the disk, read a packet into buffer2.