How to Modify iSCSI Initiator and Target Parameters

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The first part of this procedure illustrates how modified parameters of the iSCSI initiator are inherited by the iSCSI target device. The second part of this procedure shows how to actually modify parameters on the iSCSI target device.

This optional procedure assumes that you are logged in to the local system where access to an iSCSI target device has already been configured.

Become an administrator.

List the current parameter values for the iSCSI initiator and the target device.

List the current parameter values for the iSCSI initiator.

initiator# iscsiadm list initiator-node
Initiator node name: iqn.1986-03.com.sun:01:0003ba4d233b.425c293c
Initiator node alias: zzr1200
        Login Parameters (Default/Configured):
                Header Digest: NONE/-
                Data Digest: NONE/-
        Authentication Type: NONE
        RADIUS Server: NONE
        RADIUS access: unknown
        Configured Sessions: 1

List the current parameter values for the iSCSI target device.

initiator# iscsiadm list target-param -v iqn.1992-08.com.abcstorage:sn.84186266
Target: iqn.1992-08.com.abcstorage:sn.84186266
        Alias: -
        Bi-directional Authentication: disabled
        Authentication Type: NONE
        Login Parameters (Default/Configured):
                Data Sequence In Order: yes/-
                Data PDU In Order: yes/-
                Default Time To Retain: 20/-
                Default Time To Wait: 2/-
                Error Recovery Level: 0/-
                First Burst Length: 65536/-
                Immediate Data: yes/-
                Initial Ready To Transfer (R2T): yes/-
                Max Burst Length: 262144/-
                Max Outstanding R2T: 1/-
                Max Receive Data Segment Length: 65536/-
                Max Connections: 1/-
                Header Digest: NONE/-
                Data Digest: NONE/-
         Configured Sessions: 1

Note that both header digest and data digest parameters are currently set to NONE for both the iSCSI initiator and the iSCSI target device.

To review the default parameter values for the iSCSI target device, see the iscsiadm list target-param output in Example 4–1.

Modify the parameter of the iSCSI initiator.
For example, set the header digest to CRC32.
```
initiator# iscsiadm modify initiator-node -h CRC32
```
If you change the initiator node name, the targets that were discovered by iSNS might be logged out and removed from the initiator's target list, if the new name does not belong to the same discovery domain as that of the targets. However, if the targets are in use, they are not removed. For example, if a file is open or a file system is mounted on these targets, the targets will not be removed.
You might also see new targets after the name change if these targets and the new initiator node name belong to the same discovery domain.

Verify that the parameter was modified.

Display the updated parameter information for the iSCSI initiator.

initiator# iscsiadm list initiator-node
Initiator node name: iqn.1986-03.com.sun:01:0003ba4d233b.425c293c
Initiator node alias: zzr1200
        Login Parameters (Default/Configured):
                Header Digest: NONE/CRC32
                Data Digest: NONE/-
        Authentication Type: NONE
        RADIUS Server: NONE
        RADIUS access: unknown
        Configured Sessions: 1

Note that the header digest is now set to CRC32.

Display the updated parameter information for the iSCSI target device. For example:

initiator# iscsiadm list target-param -v iqn.1992-08.com.abcstorage:sn.84186266
Target: iqn.1992-08.com.abcstorage:sn.84186266
        Alias: -
        Bi-directional Authentication: disabled
        Authentication Type: NONE
        Login Parameters (Default/Configured):
                Data Sequence In Order: yes/-
                Data PDU In Order: yes/-
                Default Time To Retain: 20/-
                Default Time To Wait: 2/-
                Error Recovery Level: 0/-
                First Burst Length: 65536/-
                Immediate Data: yes/-
                Initial Ready To Transfer (R2T): yes/-
                Max Burst Length: 262144/-
                Max Outstanding R2T: 1/-
                Max Receive Data Segment Length: 65536/-
                Max Connections: 1/-
                Header Digest: CRC32/-
                Data Digest: NONE/-
        Configured Sessions: 1

Note that the header digest is now set to CRC32.

Verify that the iSCSI initiator has reconnected to the iSCSI target.

initiator# iscsiadm list target -v iqn.1992-08.com.abcstorage:sn.84186266
Target: iqn.1992-08.com.abcstorage:sn.84186266
        TPGT: 2
        ISID: 4000002a0000
        Connections: 1
                CID: 0
                  IP address (Local): nnn.nn.nn.nnn:64369
                  IP address (Peer): nnn.nn.nn.nnn:3260
                  Discovery Method: SendTargets
                  Login Parameters (Negotiated):
                        .
                        .
                        .
                        Header Digest: CRC32
                        Data Digest: NONE

(Optional) Reset an iSCSI initiator parameter or an iSCSI target device parameter.
You can reset a parameter to its default value by using the iscsiadm modify command. Or, you can use the iscsiadm remove command to reset all parameters to their default values.
The iscsiadm modify target-param command changes only the parameters that are specified on the command line.
The following example shows how to reset the header digest to NONE:
```
initiator# iscsiadm modify target-param -h none iqn.1992-08.com.abcstorage:sn...
```
For information about the iscsiadm remove target-param command, see iscsiadm(1M).