Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 269)

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101

Byte 09 - Log Parameter Code

When a log parameter (write or read error counter) meets the

threshold criteria specified with the TMC bit in the LOG SELECT

command, the CTS sets this byte to the Parameter Code for the

parameter. For more information about the LOG SELECT command,

refertoChapter8.

Byte 10 - Reserved

This byte is reserved.

Byte 11 - Underrun/Overrun Counter

The Underrun/Overrun Counter is a dual-function counter for

logging write underruns and read overruns. This counter is used to

determine the number of times the initiator failed to maintain the CTS

in streaming mode. It is incremented any time the CTS repositions the

tape after encountering an empty data buffer during a write operation

or a full data buffer during a read operation.

The counter is reset to 0 after any of the following:

A REQUEST SENSE command is issued with the CLRCNT bit

(byte 05, bit 7) set to 1. Note that in order for the reset to be

performed, 29 (1Dh) bytes of sense data must be read by the

REQUEST SENSE command.

The tape is loaded or rewound.

The mode changes from write to read or from read to write.

The CTS is reset.

The counter does not roll over from FFFFFFh to 0 but remains at

FFFFFFh until reset.

Byte 12 - Additional Sense Code (ASC)

The Additional Sense Code, in conjunction with the Additional Sense

Code Qualifier (byte 13), provides additional information about each

sense key. Appendix E lists the possible combinations of this byte

and the ASCQ byte for each sense key. Only those ASC values used

by the CTS are shown in the appendix.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

18-7

18 REQUEST SENSE (03h)

1 2 ... 264 265 266 267 268 269 270 271 272 273 274 ... 445 446

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