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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: iSCSI: FirstBurstSize, etcEddy, I am going to make some changes related to PDUsize. I will fix this discrepancy and publish the suggested 09 text soon. Thanks, Julo "Eddy Quicksall" <Eddy_Quicksall@iVivity.com> 11-10-01 22:22 Please respond to "Eddy Quicksall" To: Julian Satran/Haifa/IBM@IBMIL, <ips@ece.cmu.edu> cc: Subject: iSCSI: FirstBurstSize, etc I am wondering about the following statement: FirstBurstSize MUST NOT exceed MaximumBurstSize. It doesn't seem to fit the various definitions. I made the following diagram from the definitions and FirstBurstSize came out larger then MaxBurstSize. Here are the definitions I am going by: 25 FirstBurstSize Initiator and target negotiate the maximum amount of unsolicited data an iSCSI initiator may send to the target, during the execution of a single SCSI command, in units of 512 bytes. 24 MaxBurstSize Initiator and target negotiate maximum SCSI data payload in an iSCSI sequence (a sequence of Data-In or Data-Out PDUs ending with a Data-In or Data-Out PDU with the F bit set to one) in units of 512 bytes. I get the definition of a sequence from "2.2.2.3 Data Sequencing": For output data PDUs, DataSN starts with 0 for the first data PDU of a sequence (the initial unsolicited sequence or any data PDU sequence issued to satisfy an R2T) and advances by 1 for each subsequent data PDU. |<------------------ Unsolicited data ------------------->| | |<------------ Sequence ------------>| |Command | Immediate Data | |<---- Remaining unsolicited ------->| |========|=================| |================| |F===============| |<-DataPDULength->| | DataPDULength | | DataPDULength | |<--------- MaxBurstSize ----------->| |<------------------- FirstBurstSize -------------------->| Eddy_Quicksall@iVivity.com
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