User Manual

SCSI Commands Reference Manual, Rev. J 151
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
EHS_RETRIEVED (error history retrieved) field
The error history retrieved (EHS_RETRIEVED) field (see table 113) indicates whether a clear error history device server action has been
requested for the error history snapshot. EHS_RETRIEVED field shall be set to 00b or 10b when the error history snapshot is created.
EHS_SOURCE (error history source) field
The error history source (EHS_SOURCE) field (see table 114) indicates the source of the error history snapshot.
CLR_SUPC (clear support) bit
1 A clear support (CLR_SUP) bit set to one indicates that the CLR bit is supported in the WRITE BUFFER command download error history
mode (see 3.70).
0 A CLR_SUP bit set to zero indicates that the CLR bit is not supported.
DIRECTORY LENGTH field
The DIRECTORY LENGTH field indicates the number of error history directory list bytes available to be transferred. This value shall not be altered
even if the allocation length is not sufficient to transfer the entire error history directory list.
Table 113 EHS_RETRIEVED field
Code Description
00b
No information
01b
The error history I_T nexus has requested buffer ID FEh (i.e., clear error history I_T nexus) or buffer ID FFh (i.e., clear
error history I_T nexus and release snapshot) for the current error history snapshot.
10b
An error history I_T nexus has not requested buffer ID FEh (i.e., clear error history I_T nexus) or buffer ID FFh (i.e.,
clear error history I_T nexus and release snapshot) for the current error history snapshot.
11b
Reserved
Table 114 EHS_SOURCE field
Code Description
00b
The error history snapshot was created by the device server and was not created due to processing a READ BUF-
FER command.
01b
Error history snapshot was created due to processing of the current READ BUFFER command
10b
Error history snapshot was created due to processing of a previous READ BUFFER command
11b
Reserved