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VNX, Cellerra, Clarrion

EMC VNX: Volume is unreachable by server_2, Message ID: 13690601492

Posted by Brajesh Panda on December 6, 2012

I was running out of space in NFS stores, which are assigned to VMware farm. I created two LUNs added to ~filestorage Storage Group.

To get them detected by the NAS Pool quickly I ran Storage Scan from Unisphere; ended up with below error;

Discovering storage on corp-cstst-01 (may take several minutes)
d7 d10 d8 d9 d11 d12 d13 d15 d14: volume is unreachable by server_2.ch

Message ID: 13690601492

Also tried to scan from “nasadmin” shell using “server_devconfig server_2 -c -s -a” but ended up nearly same kind of error. Which I forget to noted down. 😉

Later on while troubleshooting found all disks (LUNs) assigned to ~filestorage Storage Group are only attached to one data mover server i.e. Server_2. As my two new luns are not showing I removed them & did couple of scanning but no luck.

After working with EMC Engineering Support found this is a bug in my existing NAS code; which has been fixed in 7.0.54.x higher. EMC engineer referred to EMC Primus article emc295151 but never gave me a copy though and told me to stay away from that debug page ;-(

Well he logged me into VNX Debug URL (https://StorageProcessorIP/debug) & then we ran “Force full poll” in both storage processor and after completion storage processor scan in nasadmin shell. It helped to rebind those LUNs to both data mover servers.

Ten added my two new luns & checked status with “nas_disk -l“, they are still unassigned to server_3.
After running a storage scan they automatically assigned to server_3. And I am able to create new NFS stores.

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Posted in EMC Storage | 2 Comments »

EMC VNX Performance Analysis – 1

Posted by Brajesh Panda on September 5, 2012

  • You must have Navisphere/Unisphere Analyzer Enabler installed on the storage array
  • Analyzer Enabler (license) will help to generate readable statistics log files, called as NAR files.
  • Without this license it will generate encrypted logs (NAZ files) and you may need help of EMC support analyze the same.

  • Make sure you start “Statistics Logging” from system properties


Read the rest of this entry »

Posted in EMC Storage, EMC VNX | 2 Comments »

How to retrieve EMC Powerpath Keys?

Posted by Brajesh Panda on March 19, 2012

Use “powermt check_registration” command on the existing node where Powerpath is installed & registered with a key.

Posted in EMC Storage | Leave a Comment »

EMC Avamar Vs EMC Data Domain

Posted by Brajesh Panda on November 21, 2011

Here is a nice article. Kudos to the author.

http://www.integrateddatastorage.com/blog/2009/11/09/data-domain-vs-emc-avamar-which-deduplication-technology-is-better/

Posted in EMC Storage | Tagged: | Leave a Comment »

The Celerra Management Service is not responding for task Query Data Movers All

Posted by Brajesh Panda on October 6, 2011

Model: VNX 5300

Unisphere: V1.1.0.1.0387

Control Station: Linux release 3.0

Nas Version: 7.0.14-0

Symptom: While browsing File Hardware details like Data Movers, File Network Details etc using Unisphere it didn’t render details & show a warning like “The Celerra Management Service is not responding for task Query Data Movers All

Data Movers looks good from ssh

Ran Health Check & Seems everything is good.

# /nas/bin/nas_checkup

Checked HTTP Daemons in Control Station

Checked NAS Daemons in Control Station

Restarted HTTPD daemon thinking Unisphere might not able to pull in details about data movers

Now Management Service Error gone – New Java webserver error popped up

Again Stopped & Started HTTPD daemon & it comes back to old state

So what is this error? Let’s reboot the control station & see how it is going 😉

SSH as Root & reboot

It comes back to good state

However is there a service/daemon which can be recycled to fix this issue without rebooting control station? I will update this thread when I will get to know that 😉

Spoke to EMC support, support guy told me – APL daemon was crashing which provides information to unishpere GUI window. Recommended way to restart the control station just to refresh all daemons. Just to note there will be no production downtime due to CS reboot.

Posted in EMC Storage, VNX5300 | Tagged: , | 3 Comments »

 
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