vsphere-esxi-vcenter-server-55-storage-guide

vSphere StorageTable 11‐5. Additional Parameters for iSCSI InitiatorsAdvanced Parameter Description Configurable OnHeader DigestData DigestMaximumOutstanding R2TFirst Burst LengthMaximum BurstLengthMaximum ReceiveData Segment LengthSession RecoveryTimeoutNo-Op IntervalNo-Op TimeoutARP RedirectIncreases data integrity. When header digest is enabled, the systemperforms a checksum over each iSCSI Protocol Data Unit’s (PDU’s)header part and verifies using the CRC32C algorithm.Increases data integrity. When data digest is enabled, the systemperforms a checksum over each PDU's data part and verifies usingthe CRC32C algorithm.NOTE Systems that use Intel Nehalem processors offload the iSCSIdigest calculations for software iSCSI, thus reducing the impact onperformance.Defines the R2T (Ready to Transfer) PDUs that can be in transitionbefore an acknowledge PDU is received.Specifies the maximum amount of unsolicited data an iSCSIinitiator can send to the target during the execution of a single SCSIcommand, in bytes.Maximum SCSI data payload in a Data-In or a solicited Data-OutiSCSI sequence, in bytes.Maximum data segment length, in bytes, that can be received in aniSCSI PDU.Specifies the amount of time, in seconds, that can lapse while asession recovery is performed. If the timeout exceeds its limit, theiSCSI initiator terminates the session.Specifies the time interval, in seconds, between NOP-Out requestssent from your iSCSI initiator to an iSCSI target. The NOP-Outrequests serve as the ping mechanism to verify that a connectionbetween the iSCSI initiator and the iSCSI target is active.Specifies the amount of time, in seconds, that can lapse before yourhost receives a NOP-In message. The message is sent by the iSCSItarget in response to the NOP-Out request. When the no-op timeoutlimit is exceeded, the initiator terminates the current session andstarts a new one.Allows storage systems to move iSCSI traffic dynamically from oneport to another. ARP is required by storage systems that do arraybasedfailover.Software iSCSIDependent HardwareiSCSISoftware iSCSIDependent HardwareiSCSISoftware iSCSIDependent HardwareiSCSISoftware iSCSIDependent HardwareiSCSISoftware iSCSIDependent HardwareiSCSISoftware iSCSIDependent HardwareiSCSISoftware iSCSIDependent HardwareiSCSISoftware iSCSIDependent HardwareiSCSISoftware iSCSIDependent HardwareiSCSISoftware iSCSIDependent HardwareiSCSIIndependent HardwareiSCSIDelayed ACK Allows systems to delay acknowledgment of received data packets. Software iSCSIDependent HardwareiSCSIConfigure Advanced Parameters for iSCSI in the vSphere Web ClientThe advanced iSCSI settings control such parameters as header and data digest, ARP redirection, delayedACK, and so on.CAUTION Do not make any changes to the advanced iSCSI settings unless you are working with theVMware support team or otherwise have thorough information about the values to provide for the settings.96 VMware, Inc.