scsi interface specification - Plasmon

DRIVE COMMAND SETACCESS EVENT LOG (ECH)Allocation LengthThe Allocation Length should be the number of bytes to be transferred during the DATA OUT phase for thepages requested in the Page Code field (6000 Log Mode) or OPT field (4000 Log Mode) and a 4-byteEvent Log Header shown in Table 8. The data-out phase will end when either the allocation length hasbeen reached or the number of bytes available for the requested page(s) plus a 4-byte header has beenreached. An Allocation Length of zero means that no bytes will be transferred. An Allocation Length lessthan four and greater than zero will result in a CHECK CONDITION status with an ILLEGAL REQUESTsense key.The format of 6000 log mode data is as described in Table 9 through Table 22. The format of 4000 logmode data is as described in Table 23 through Table 25.By default, the System Event Log (Page Code A) is disabled. The recording of the System Event Log maybe enabled by setting bit 6, byte 3, of the vendor unique Page 20 of the MODE SELECT command (seethe SYSLOG section in the Vendor-Unique Parameters for a description).Table 6. OPT Field Values (4000 Log Mode)OPTVALUECAN BECLEAREDCAN BE DISABLED0 Yes (See Specific Option [OPT]Value in This Table)DESCRIPTIONSend Total Event Log Data(The data will be sent in the order ofPredictive Maintenance Statistics, Read DataLog and then Write Data Log.)1 Yes Yes Send Data Logged for Write Commands2 Yes Yes Send Data Logged for Read Commands3 Yes No Send Predictive Maintenance Statistics97653978 HPage 29