vmware esxi 5.1 iscsi readynas 2100 doesn't connect

Posted on 2013-05-17
Last Modified: 2013-06-17
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.
Question by:snowdog_2112
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LVL 120
ID: 39175548
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?

Author Comment

ID: 39175901
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)
LVL 120
ID: 39175920
this hosts IQN has been added to the LUNs on NAS?
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Author Comment

ID: 39181260
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).
LVL 120
ID: 39199697
can you upload screenshots of the ReadyNAS configuration of LUNs?

Author Comment

ID: 39202060
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.
LVL 120
ID: 39202144
if you remove one LUN config from the NAS, does the ESXi host server connect to it correctly, the new one?

Author Comment

ID: 39202610
Can't remove a LUN - they are active production LUN's on the 2 other hosts.

I could add a new target and LUN...
LVL 120
ID: 39202908
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?

Accepted Solution

snowdog_2112 earned 0 total points
ID: 39242203
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.
LVL 120
ID: 39242223
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.

Author Closing Comment

ID: 39252592
None of the suggested solutions mentions MTU.

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