Header digest and data digest

This section describes how to reset the digest fields to none.

When you are discovering a target, do not set the header digest and data digest to CRC32 because it is not supported in the discovery phase. Set the value to none.

To set the header digest and data digest parameter to none, use the following commands:

Issue the following command:

iscsiadm modify initiator-node –h none –d none

After you have set up the connection to the target, you can change the digest fields to CRC32.
- Set the header digest to CRC32.
```
iscsiadm modify initiator-node -h CRC32
```
- Set the data digest to CRC32.
```
iscsiadm modify initiator-node –d CRC32
```

Display the updated parameter information for the iSCSI target device.

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: CRC32/-
        Configured Sessions: 1

The initiator reconnects with the target after you modify the parameter.

Verify that the iSCSI initiator reconnects to the iSCSI target.

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: CRC32