iSCSI error "0101 in Vmware vSphere v5

Environment:  vSphere v5
SAN: Dell Equalogics

Issue:  had 15 volumes that were able to be seen from vmware. after patching only 10 show up, and ESX gives error: target returned login error of: 0101 for iSCSI

All was working prior to patch. Each is multi-pathed

In Static discovery it looks like the volumes are mapped in the SW iscsi adapter, but in storage 5 of the volumes dont show up
Found this article, but I dont think CHAP is being used.
Who is Participating?
Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
if you drop chap on the Equalogic, and use iSCSI Initiator as the connector, and re-scan do they show up?

are the LUNs present, but not the datastore?

it might be worth logging into ESX using SSH or at the console and typing

esxcfg-volume -l

and if the luns are present, but the datastores are not mounted, mounting them seperately.
IndyrbAuthor Commented:
dropped chap on equlagoic , and it appears in the same status.
Not sure where to check for luns, but they diffently dont show up in datastore.
May be important to note, that I think the VMs use RDM for their drives.

If all Luns show up with the esxcfg-volume-l command but not mounted, how do you mount them? how do you see which ones arent mounted.

Thanks for your feedback
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
are the VMs using LUNs (RDMs), because you will not have datastores?
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