Thursday, June 15, 2023

Install Open VM Tools on Linux VM

Depending on the distro of Linux, I have tough time to install VM Tools on some of them.  The only other option is to install open vmtools.  

Follow VMware instructions to install the open vmtools.

If GUI is required on the VM and assume it is Debian distro, install open-vm-tools-desktop.  

sudo apt-get install open-vm-tools-desktop

Otherwise open-vm-tools will be sufficient.

sudo apt-get install open-vm-tools  

Monday, June 5, 2023

No Port Down email alert from DCNM

We used to have SNMP to monitor all FC port down event.  However, it causes a lot of un-necessary calls from NOC after hours.  Because we have most of the prod servers setup with 4 HBAs, we decide to use SMTP alert to email to storage team members only.  However, it never seems to work with DCNM.  We did see Port up alert but not for Port down regardless of what settings we choose.  

After opening a ticket with support, we were told the setting was disable by default.  If you want to receive email alerts for port down event, go to Server Properties of DCNM.  Look for event.linkDown.log and set it to True.  By default, it is set to False.  Then restart the DCNM services and port down alerts will be sent to your SMTP server depending on your setup.  



Cisco bug CSCvz61883

Check the bug info at Cisco site for CSCvz61883 / EMC article 000197332 and it applies to the MDS 9700 32G FC modules in our environment.  The DS-X9648-1536K9 linecard in MDS 9700 can be affected at almost exactly 468 days of uptime.  

Our MDS 9710 with 32G linecard are running 8.1(1a) with supervisor 3 and 8.4(1a) with supervisor 4.  Runs the command below against the 32G linecard in MDS9710 to see module uptime.  In our environment, they reach 426 and 417 days respectively.    

slot x show system uptime   

8.4(2d) does provide the fix to the issue but it is quite new.  Open a ticket with support and the recommendation is to upgrade to 8.4(2c).  This will reset the module uptime back to zero and buy another 400+ days.  With 8.4(2), there is a workaround to reset the uptime for the device non-disruptively.  You can consider another firmware update after 400 days on the FC switch.  

Finished the upgrade to 8.4(2c) last week.  Upgrade to 8.4(2c) on MDS 9710 with supervisor 3 is much faster than MDS 9710 with supervisor 4.  

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Updated in late May 2023

Another reason we never considered 8.4(2d) was due to CSCwb29379 (see release notes 8.4(2e) below) 

Cisco MDS 9000 Series Release Notes, Release 8.4(2e)

8.4(2e) was available for quite some time now.  So, we upgraded to 8.4(2e) couple weeks ago to fix this problem permanently.