TPG enable after disabling it on iscsi target does not allow initiator to perform read/writes on the iscsi disks

[linonymous]

Following is the scenario.

• Steps: 1) Created a target, added LUNs, ACLs, and portals (CHAP authentication is disabled) 2) Discovered these LUNs from iSCSI Initiator, created a filesystem on the iSCSI disks, and performed read/writes 3) Disabled the TPG of the target and again enabled it on the iSCSI target machine. 4) On iSCSI initiator side, now I am not able to perform read/writes, it gives "I/O error"

• The configuration of the machines: 1) iSCSI Target machine: [root@linonymous1 /]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.3 (Maipo) [root@linonymous1 /]# rpm -qa targetcli targetcli-2.1.fb46-1.el7.noarch [root@linonymous1 /]# rpm -qa | grep rtsl python-rtslib-2.1.fb63-2.el7.noarch

2) iSCSI Initiator machine: [root@sprip4_01 ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.4 (Maipo) [root@sprip4_01 ~]#rpm -qa | grep iscsi iscsi-initiator-utils-iscsiuio-6.2.0.874-7.el7.x86_64 iscsi-initiator-utils-6.2.0.874-7.el7.x86_64

• The workaround Restart the target daemon on the target side.

Could you please tell why is it that case? and why does it happen?

[linonymous]

While disabling the TPG I am removing the disk where LUNs are stored, and reattach it when it comes online. @pkalever @agrover does this affects the targetcli configuration? what is the flow?