New answers tagged iscsi
The version of tgtd that shipped with Centos 6 (even fully patched) has this problem. I ended up having to build tgtd from source. The version I used was fujita-tgt-v1.0.27. I believe it came off the Fedora 17 site at the time, though there is probably a newer version out there now.
You can identify loged-in iSCSI targets by their path. In your case it will be - /dev/disk/by-path/ip-10.1.1.100:3260-iscsi-iqn.2005-06.com.drobo:b800i.1112.id5-lun-0
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