Displaying statistics for iSCSI sessions

Displaying iSCSI statistics  

Displaying iSCSI statistics using the command line

To display iSCSI statistics, complete the following step.

iscsi stats

iSCSI PDUs Received

  SCSI-Cmd:  229  |  Nop-Out:        0  |  SCSI TaskMgtCmd:   0

  LoginReq:    4  |  LogoutReq:      1  |  Text Req:          1

  DataOut:     0  |  SNACK:          0  |  Unknown:           0

  Total: 235

iSCSI PDUs Transmitted

  SCSI-Rsp:  221  |  Nop-In:         0  |  SCSI TaskMgtRsp:   0

  LoginRsp:    4  |  LogoutRsp:      1  |  TextRsp:           1

  Data_In:    17  |  R2T:            0  |  Asyncmsg:          0

  Reject:      0

  Total: 244

iSCSI CDBs

  DataIn Blocks:  127  |  DataOut Blocks:       0

  Error Status:     3  |  Success Status:     226

  Total CDBs: 229

iSCSI ERRORS

  Failed Logins:     1  |  Failed TaskMgt:      0

  Failed Logouts:    0  |  Failed TextCmd:      0

  Protocol:          0

  Digest:            0

  PDU discards (outside CmdSN window): 0

  PDU discards (invalid header):       0

  Total: 145

Displaying iSCSI statistics using FilerView

To display iSCSI statistics, complete the following step.

Step	Action
1	Click LUNs > iSCSI > Report. Result The following information is displayed:

Interpreting iSCSI statistics  

The iscsi stats command and the FilerView LUNs > iSCSI > Report page both display the following statistics:

iSCSI PDUs received

This section lists the iSCSI Protocol Data Units (PDUs) sent by the initiator. It includes the following statistics:

• SCSI-CMD--SCSI-level command descriptor blocks.
• LoginReq--Login request PDUs sent by initiators during session setup.
• DataOut--PDUs containing write operation data that did not fit within the PDU of the SCSI command. The PDU maximum size is set by the storage system during the operation negotiation phase of the iSCSI login sequence.
• Nop-Out--A message sent by initiators to check whether the target is still responding.
• Logout-Req--A request sent by initiators to terminate active iSCSI sessions or to terminate one connection of a multi-connection session.
• SNACK--A PDU sent by the initiator to acknowledge receipt of a set of DATA_IN PDUs or to request retransmission of specific PDUs.
• SCSI TaskMgtCmd--SCSI-level task management messages, such as ABORT_TASK and RESET_LUN.
• Text-Req--Text request PDUs that initiators send to request target information and renegotiate session parameters.

iSCSI PDUs transmitted

This section lists the iSCSI PDUs sent by the storage system and includes the following statistics:

• SCSI-Rsp--SCSI response messages.
• LoginRsp--Responses to login requests during session setup.
• DataIn--Messages containing data requested by SCSI read operations.
• Nop-In--Responses to initiator Nop-Out messages.
• Logout-Rsp--Responses to Logout-Req messages.
• R2T--Ready to transfer messages indicating that the target is ready to receive data during a SCSI write operation.
• SCSI TaskMgtRsp--Responses to task management requests.
• TextRsp--Responses to Text-Req messages.
• Asyncmsg--Messages the target sends to asynchronously notify the initiator of an event, such as the termination of a session.
• Reject--Messages the target sends to report an error condition to the initiator, for example:
  • Data Digest Error (checksum failed)
  • Target does not support command sent by the initiator
  • Initiator sent a command PDU with an invalid PDU field

iSCSI CDBs

This section lists statistics associated with the handling of iSCSI Command Descriptor Blocks, including the number of blocks of data transferred, and the number of SCSI-level errors and successful completions.

iSCSI Errors

This section lists login failures and other SCSI protocol errors.

Copyright © 1994-2005, Network Appliance, Inc. All rights reserved.
Part No. 210-01094_B0
File: c11mgt-8.htm
Last updated: 08-Dec-2005 13:25:39