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19 Posts
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2019
Host Lost Connectivity to storage.
VM Ware host lost connectivity yo storage cx4-120 for 35 ms of time and it is automatically connected back.
We have two SAN switches, but there is no cross connection between SAN switches and SPs (1 port from each SP for host connectivity and one from each SP for synchronous mirror) . The fail over mode at Clariion is 4 and in vm it is round robin. Any body have faced this kind of issue? What will be the reason behind this intermittent LUN disconnection.
Vipin VK
812 Posts
1
November 8th, 2014 10:00
I would suggest you to have an SR opened if not done so already. Support may require switch logs to find the root cause. Have you checked for any errors on switch ports ?
AnkitMehta
1.4K Posts
0
November 8th, 2014 17:00
When you say Host lost connectivity are you saying all the Datastores were Inactive?
If yes, did you check the switches, if there was any issue with the switch connectivity or cabling?
When you open an SR with CLARiiON Support, if there is no instance of SP Reboot, the best bet and what they would recommend you would be to check with
- VMware Support
- Switch Support
sarathpv
19 Posts
0
November 8th, 2014 19:00
there is no SP reboot events/ switch events that states connectivity loss or reboot.
brettesinclair
715 Posts
0
November 9th, 2014 01:00
check the esxi vmkernel.log for APD (all paths down) entries. These are the entries created when paths are lost transiently, as opposed to PDL (permanent device loss)
cat /var/log/vmkernel.log |grep -i -C 2 'apd'
That should give some insight into what happened host side so you can correlate with logs in the sp collects.
sarathpv
19 Posts
0
November 12th, 2014 07:00
In VM kernal logs APD error is there
sarathpv
19 Posts
0
November 12th, 2014 07:00
There is no user impact due to this LUN disconnection issue. as the error message itself says LUN disconnected for 35 Milli seconds.
kelleg
4.5K Posts
0
November 12th, 2014 08:00
How many connections (I'm assuming that you're using FC connections and not iSCSI) do you have from the host to the array? Does each host have two HBA's and there are two paths for each HBA?
If you have Mirrorview/Sync you should try to not use the same SP ports for host connections.
glen
sarathpv
19 Posts
0
November 12th, 2014 10:00
Yes your are right, it is an FC environment. Unfortunately we have only 2 paths configured for the Host (1/SP) and 2 paths reserved for sync mirror.
brettesinclair
715 Posts
0
November 12th, 2014 13:00
Did it only happen once ?
What was the actual message(s) in the vmkernel.log ?
kelleg
4.5K Posts
0
November 12th, 2014 14:00
I'm pretty sure you can have up to 4 Front-end ports on the CX4-120. The highest numbered port on the shipped configration will be your MirrorView port and the will not change if you add more ports.
glen