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vmware esxi 5.1 iscsi readynas 2100 doesn't connect

I have 2 esxi 4.1 hosts already connected to my Netgear ReadyNAS 2100 with iscsi, and I'm trying to add the 3rd host, running esxi 5.1.

The static discovery on the iscsi storage adapters shows me all of the targets, but does not add the paths.

I've added the iscsi name on the ACL on the readyNAS - no go.

Just upgraded the NAS to 4.2.22, still no go.
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snowdog_2112
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snowdog_2112
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1 Solution
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
is this problem with ESXi 5.1 only?

is the NAS certified for use with ESXi 5.1?

do the LUNs appear on the ESXi 5.1 host?
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snowdog_2112Author Commented:
Problem only with esxi 5.1 host: YES

NAS on Storage HCL:  YES (with firmware 4.2.21, 4.2.22 installed)

LUN's appear on 5.1 host: NO  (see attached - I see the targets, but in Storage Adapters, no LUN's, no Paths)
Capture.JPG
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
this hosts IQN has been added to the LUNs on NAS?
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snowdog_2112Author Commented:
Yes - I've triple-checked this.  One LUN on the ReadyNAS, in fact, does not have ACL's enabled (which seems like a bad plan, but I inherited this config).
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
can you upload screenshots of the ReadyNAS configuration of LUNs?
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snowdog_2112Author Commented:
Is there something you're looking for in the LUN config on the NAS?

I am copy/pasting the IQN from the hosts to the NAS interface, and as mentioned, one Target/LUN does not even have ACL's enabled.

There is one LUN per target defined on the NAS.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
if you remove one LUN config from the NAS, does the ESXi host server connect to it correctly, the new one?
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snowdog_2112Author Commented:
Can't remove a LUN - they are active production LUN's on the 2 other hosts.

I could add a new target and LUN...
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I would escalate to Netgear Support, some configuration must be incorrect, for the LUN not to be seen.

What size is the LUN?

have you tried adding LUNs to existing targets?
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snowdog_2112Author Commented:
Contacted VMware - we reset the MTU on all devices - vSwitch, port group, and NIC.  Started working.

I must not have hit the magic combination in my testing various settings - though I am pretty sure I did, because MTU was one item I specifically looked at.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
very strange....seems like a bug that frames would cause an issue not to connect!

what was the frame (MTU) set to? normally you would use Jumbo Frames >=9000.
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snowdog_2112Author Commented:
None of the suggested solutions mentions MTU.
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