Is there any impact of upgrading OST plug-in on media server

NBU services must be restarted after installing updated plugin.

I would personally suspend/stop all activity on the media server before updating the plugin.

HirVikas,

Does upgrading OST plugin on media server have any impact.

ans: you need to check the plugin OS compatibility as well

Can we upgrade OST plugin while backups are running or do we need to stop the backups?

Ans: No. you need to stop the Netbackup services first and then upgrade the plugin.  

Does it require to restart media server services after upgrade.

Ans: for installation of the plugin you need to stop the netbackup services.

From the release notes :

DD OS 5.4 is supported on the following Data Domain systems: l Appliance Series: DD990, DD7200, DD890, DD880,DD4500, DD860, DD690, DD4200, DD670, DD660, DD2500, DD640, DD630, DD620, DD610, DD580, DD565, DD530, DD510, DD160, DD140, DD120 

Is mangement aware of the security vulnerabilityies in DDOS ? - just to help you out.

The GNU BASH (Bourne Again SHell) implementation has been updated to resolve the following vulnerability: CVE-2014-6271

The GNU C library (glibc) implementation has been updated to resolve the following vulnerability: n CVE-2015-0235 (popularly known as "GHOST") l

The ntpd implementation of the Network Time Protocol has been updated to resolve the following vulnerabilities: CVE-2014-9293 n CVE-2014-9294 n CVE-2014-9295 n CVE-2014-9296 

The OpenSSL implementation has been updated to resolve the following vulnerability: n CVE-2014-3566 (popularly known as "POODLE")

They can have different versions.