Difference between VDM and Physical DM

Question

Hello,

I want to know how VDM differentiates with Phyical Data Mover.

Physical Data Mover: I know it is the hardware component

In our case, I have created below in our VNX5500 Unified;

--> Device "DeviceX" by utilizing DM's two ports cge-1-0 and cge-1-1

--> An interface with IP "x.x.x.x" on the "DeviceX"

2nd Question

Once I get to understand above, other question is related to it.

We are setting Antivirus for CIFS, and in "Using Event Enable for VNX" guide, under "Create the cepp.conf file" it is mentioned below;

" = name of CIFS server used by the event publishing agent to access the files

in the system. If you do not include this option, the Data Mover uses the first CIFS server

that it finds. If you include this option, the server specified must be a physical Data

Mover, not a VDM, in order for the EMC CAVA service to start on the Data Mover."

Please help me in my both queries.

Thanks.

Anonymous User · Answer

CAVA service has to be on Physical DM, that's the requirement for CAVA to run, because it Scans all files easily.

VDM are used for easy management and more usage of resources. It also helps in Isolation of Servers like CIFS and NFS environments. VDM is also used in Migration purposes.

Overall the resources will be utilized from Physical DM, but we have VDMs configured for different purposes. Please refer below guide :

http://www.emc.com/collateral/software/white-papers/h10741-vnx-data-movers-wp.pdf

SunshineM · Answer

I have this document, but could not get the exact difference, that's why I posted here. So was after simple to understand the difference.

And secondly, I know CAVA service requires Physical DM. That's is why I asked do I have to mention the "CIFS_server_name" which I have created on "DeviceX"?

SunshineM · Answer

I got my answer, the CIFS server I have created is directly on Physical DM and NOT VDM nas_server -list -vdm Output does not show any VDMs that I have created. Thanks

AlvaroG · Answer

Hi,

First of all you have to understand that the VDM are mounted over the DM.

The VDM really are special filesystems that contains the Shares, Local Users, Local Groups, quotas, etc of the filesystem and CIFS mounted over this particular VDM.

In terms of operations the are very similar with the followings differences:

- You can´t replicate or move a DM to another VNX, because you don´t have a conatiner of shres, etc.

- The VDM in the other hand could be replicated to other site.

- The VDM allows to have separation of the data.

- In a DM you have access to all the filesystems created in the VNX, either mounted in the physiacal DM or inside a VDM. That is the reason why is used to CAVA, because it can access all the filesystems.

- The DM is capable of FTP, HTTP, the VDM not.

VNX

Difference between VDM and Physical DM

Was this post helpful?