So when you try to click Properties of the iSCSI adapter to modify certain settings, you see the following error:
Error:
Call «IscsiManager.QueryBoundVnics» for object «iscsiManager-##» on vCenter Server «VC-name» failed
Cause:
This event occurs when ESXi’s internal iSCSI daemon becomes corrupted, requiring a cleanup of the daemon’s files in ESXi.
How to resolve this:
1. Migrate all virtual machines using vMotion to ESXi hosts that are unaffected.
2. Review the existing iSCSI configuration and copy the IQN and adapter settings for your iSCSI software adapter to a text document.
3. Disable the iSCSI adapter.
4. Navigate to the /etc/vmware/vmkiscsid/ directory on your ESXi host and back up the contents of the folder to a safe location.
5. Delete the contents of /etc/vmware/vmkiscsid/
6. Write the changes to the ESXi boot bank using this command:
# backup.sh
7. Reboot the ESXi host.
8. Create a new software iSCSI adapter and configure it as per the backup you saved in step 2.
9. Add the iSCSI port bindings and targets.
That’s pretty much it. You should be good to go.