UNITY NAS NDMP BACKUP PERFORMANCE

Question

Hello We need to replace several VNX5600 NASs each equipped with 4 x DB XBlades (3 + 1) and backed up to NDMP on DataDomain and tapes As UNITY does not know how to make 2-way NDMP at the moment, what are the recommendations for optimizing backup flows in NDMP? On our VNX5600, we have 3 active DMs each managing 8 backup streams, ie a total of 24 NDMP flows on FC @ 8 Gb / s, or a total thermal of 192 Gb / s. How to replace the VNX5600 NAS by UNITY that can have the same NDMP backup performance? Knowing that on the U300 / 400 it is possible to manage only 8 Fluxes in 3-way via the LAN 10 Gb and that it is impossible to put 8 ports 10Gb on each UNITY. In addition, the U500 / 600 models can handle 20 NDMP streams, but what number of 10 Gb network links can parallel us for maximum performance? Thanks for your feedback B.Rgds

Rainer_EMC · Accepted Answer

Yes

I would suggest to start with the Unity White papers to get familiar with the Unity archtitecture.

In terms of sizing for NDMP the approach I recommend is to size to actual usage vs. theoretical bandwidth.

I.e. measure how much NDMP peformance is used with the current VNX/Celerra systems - then work with your local Speed Guru on sizing for Unity.

Rainer

Peter_EMC · Answer

Typically a VNX5600 DM is using AUX-Port 0 for FC Tape connectivity.

This means all (8) NDMP backup streams of the DM are using (sharing) this single FC 8 Gb/s port for tape connectivity.

Please check your hardware setup, I do not think your 4 DMs are using 4 x 8 = 32 FC 8Gb/s ports

Best Regards

fatr2705 · Answer

Yes you're right, each DM only use 1 port @ 8 Gb/s, but there are 3 x DM to be replaced by only 1 in the UNITY. So how can do do to have the same performance ? Brgds

Peter_EMC · Answer

It is 3 to 2. Both Unity SPs are active Maybe LACP could also improve performance

fatr2705 · Answer

Hi Peter, You said that both SPs are active on NAS, but is it possible to share One File system on both SPs or do we have to split one FS per SP ? Brgds

Peter_EMC · Answer

No, one FS is only on one SP, no filesystem sharing between the SPs.

Think of each SP as of one active DM on your VNX.

Of course you need to distribute the data of your three now active DM to two Unity SPs.

fatr2705 · Answer

Thanks Peter,

And what about redundancy ? If we have 2 SPs that each support their own file systems and one of the SPs falls (eg SPA), will the other SP (SPB) support SPA file systems in addition to his own file systems? Brgs

fatr2705 · Answer

Many Thanks Rainer I will do that B.Rgds

Unity

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