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32
Table 4:
Read and write retry count maximum recovery times [1]
Read retry
Maximum recovery time per
count
LBA (cumulative, msec)
0
108.7
1
125.4
2
426.4
3
459.8
4
526.7
5
593.6
6
760.3
7
877.2
8
919.0
9
985.1
10
2,273.2
11 (default) 3,223.4
[1]
These values may change at any time. They are presently for general information only.
Setting these retry counts to a value below the default setting could result in an increased unrecovered error
rate which may exceed the value given in this product manual.
For example, suppose the read/write recovery page has the RC bit = 0, the read retry count set to 4, and the
recovery time limit (Mode Sense Page 01, bytes 10, 11) set to 450. A 4-block read command can take up to
159 msec recovery time for each block and a maximum of 450 msec recovery for all 4 blocks. If either of these
limits is reached and a block has not yet been recovered, the command will end with CHECK CONDITION sta-
tus and an unrecoverable read error will be reported.
7.3
SCSI systems errors
Information on the reporting of operational errors or faults across the interface is given in the SCSI Interface
Product Manual, part number 77738479. Message Protocol System is described in the SCSI Interface Product
Manual. Several of the messages are used in the SCSI systems error management system. The Request
Sense command returns information to the host about numerous kinds of errors or faults. The Receive Diag-
nostic Results reports the results of diagnostic operations performed by the drive.
Status returned by the drive to the Initiator is described in the SCSI Interface Product Manual. Status reporting
plays a role in the SCSI systems error management and its use in that respect is described in sections where
the various commands are discussed.
Write retry
Maximum recovery time per
count
LBA (cumulative, msec)
0
50.2
1
75.2
2
83.6
3
108.7
4
259.2
5 (default)
317.7
Barracuda 50 Product Manual, Rev. C
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