Hi Sue,  First of all it's good to know that the deduplication feature in Celerra works in two ways: 1. Deduplication at the file level. If two files are the same the only is stored and the other is only a link. 2. Compression. Usually compression can achieve 50% in average for a typical set of mixed files.  1) What type of dedup ratio did you get? For your specific case if you have iso images and they are already compressed then you will get a very low compression ratio. Chances are that all your iso images are different so you would also get very few deduplicated files.  2)  What type of ratio  did you get for VMWare images,   ISO images?  Some of our engineering  teams images only dedup at about 1%. You may get only about 1% bacause of the reasons I explained. Maybe using a block-based deduplication software would help you better like Vmware Data Recovery. It implements de-duplication internally at the virtual level.  3) Any issues with NDMP  backups and restores?  (We use Networker). If you are using Networker version 7.4.1 and later you should be all right because it supports all features of NDMP on Celerra. Have a look at the compatibility list that I attached. Taken from Powerlink.  4) Any performance  issues? Write operations - Should be a no performance impact because the deduplication runs on-schedule not on-write. It should take up to 5% of CPU and the datamover is designed to dedupe & compress files at an incredible rate. Read operations - In this case it should have really low impact for a typical PC user.  Cheers
We recently upgraded our Celerra NS80 to code level 5.6.47.11 so we could take advantage of  latest deduplication features.    Questions: 1) What type of dedup ratio did you get? 2)  What type of ratio did you get for VMWare images,   ISO images?  Some of our engineering teams images only dedup at about 1%. 3) Any issues with NDMP backups and restores?  (We use Networker). 4) Any performance issues?   Thank you, Sue
Dedup on a Celerra and Networker Backups