Range Dell EqualLogic has stopped working when you restart the failure

During and after an interruption of scheduled maintenance work, ESXi cannot mount on our Dell EqualLogic Array data warehouses and I have no idea why.

We lack ESXi 5.0.  Shut down us throughout the weekend, replaced the network cables and when we returned to our ESXi hosts could not see the Bay EqualLogic iSCSI, but you could see several other berries on the same storage system iSCSI.  Digging into logs, I see the ESXi host making the CHAP authentication to the EqualLogic Bay, and the said table it connects successfully, then it loses connection about 10 seconds later.  10 seconds more ESXi tent reconnection to the EqualLogic and the same thing is happening again.

I see several newspapers in ESXi hostd.log indicating this table goes ONLINE and off LINE and another line indicating "sense data Possible" leading me to http://KB.VMware.com/kb/289902 .  I feel really disabled at the moment because it's the Bay of storage accommodation our vCenter Server, which puts us in trouble right now.

Also, if I try to "Add Storage", ESXi sees EqualLogic stores exist (watch a sufficient volume, size etc.).  However, as I'm trying to add them (via vSphere Client), step 1 takes a lot of time to finish, step 2 indicates the "disks are empty" (which I don't believe), then after an another long this timeout a popup error.

Are there commands or utilities that are good for the diagnosis of iSCSI specifically?

I can post more specific journal details if it is useful.

PS - The new network cables are ok in communication with other storage targets, and it has not replaced the EqualLogic cables.

Fixed; the MTU setting on my storage switch was mowing part of storage traffic.  Here are the troubleshooting steps that I went through, maybe it'll help someone else.  The solution didn't exactly have anything specific to do with ESXi or EqualLogic.  Basic troubleshooting and digging.

Newspapers/events storage array inspection revealed he saw and accepted the ESXi host connection appempts.  I saw messages to the effect of:

-Connection of ESXi iqn blah blah blah established; Successful CHAP authentication.

-10 seconds later: Connection reset / abandoned by peers.

-5 seconds later: ESXi connection successfully established...

(rinse and repeat several times)

Inspection of the file hostd.log ESXi showed several messages of 'connection reset by peer '.  The storage array and ESXi have been pointing to the other... so the switch is the only thing in the middle.

Troubleshooting steps now:

-using the vmkping ping on the table of the ESXi - success: vmkping 192.168.1.20

-using the vmkping ping on the table of the ESXi with a size of 9000 (jumbo frame size): NO RESPONSE! : (vmkping) s 9000 192.168.100.20<-- this="" is="" where="" the="" money="" was="" for="" finding="" the="">

MTU has been set at around 9000.  It turns out that the switch should be set a little higher (taking into account headers of packets? who knew)

So this Setup ran for more than a year of intact working and just stopped when we took everything downstairs and brought it up.

Tags: VMware

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