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Barracuda 18LP Product Manual, Rev. E
[1]
These values are subject to change.
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. A setting of zero results in the drive not perform-
ing error recovery.
For example, suppose the read/write recovery page has the RC bit = 0, the read retry count set to four, and the
recovery time limit (Mode Sense Page 01, bytes 10, 11) is set to FF FF hex (maximum). A four LBA read com-
mand is allowed to take up to 526.68 msec recovery time for each of the four LBAs in the command. If the
recovery time limit (Mode Sense Page 01, bytes 10, 11) is set to 00 C8 hex (200 milliseconds decimal) a four
LBA read command is allowed to take up to 200 milliseconds for all error recovery within that command. The
use of the recovery time limit field (Mode Sense Page 01, bytes 10,11) allows finer granularity on control of the
time spent in error recovery. The Recovery Time Limit only starts counting when the drive is executing error
recovery and it restarts on each command. Therefore, each command’s total recovery time is subject to the
Recovery Time Limit. Note: A RTL of zero (0) will use the drive default value of FF FF. Minimum RTL is
achieved by specifying the RTL set to 00 01.
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.
Table 4:
Read and write retry count maximum recovery times [1]
Read retry
count
Maximum recovery time per
LBA (cumulative, msec)
Write retry
count
Maximum recovery time per
LBA (cumulative, msec)
0
108.68
0
91.96
1
125.4
1
117.04
2
426.36
2
125.4
3
459.8
3
150.48
4
526.68
4
300.96
5
593.56
5
359.48
6
677.16
6
593.56
7
802.56
7
618.64
8
836
8
660.44
9
911.24
9
685.52
10
2,371.24
10
1,735.68
11 (default)
3,422.04
11
1,760.76
12
1,769.12
13
1,794.2
14
1,944.68
15
2,003.2
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