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Table 3
Read and write retry count maximum recovery times
Maximum recovery time per
Read retry count*
LBA (cumulative, ms)
1
124.32
5
621.62
10
1243.23
15
1864.85
20 (default)
2486.47
* For read retry count, every tick ~ 5% of total error recovery. Valid range setting is 1-20.
e.g. 1 ~ 5%
5 ~ 25%
20 ~ 100%
Setting these retry counts to a value below the default setting could result in degradation of the unrecovered error rate. For example, suppose the
read/write recovery page has the RC bit = 0 and if the read retry count is set to 5, this means ~ 25% of error recovery will be executed which
consumes 621.62 ms (please refer to the table above). If the limit is reached and a LBA has not yet been recovered (i.e. requires retries beyond
621.62 ms), the command will end with Check Condition status report and unrecoverable read error will be reported.
9.3
SAS system errors
Information on the reporting of operational errors or faults across the interface is given in the SAS Interface Manual. The SSP Response returns
information to the host about numerous kinds of errors or faults. The Receive Diagnostic Results reports the results of diagnostic operations
performed by the drive.
Status returned by the drive to the initiator is described in the SAS Interface Manual. Status reporting plays a role in systems error management and
its use in that respect is described in sections where the various commands are discussed.
Seagate Enterprise Capacity 3.5 HDD v5 SAS Product Manual, Rev. F
Maximum recovery time per
Write retry count
LBA (cumulative, ms)
0
35.94
1
53.91
2
79.89
3
97.86
4
175.85
5 (default)
421.79
37
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