DD2500 expected performance

Question

Hi, Can anyone tell me what sort of restore speeds I should expect form a DD2500? We have a customer who is complaining about the performance of the clone to tape jobs. They are getting about 20MB/s spiking up to about 50MB/s occasionally. A restore from DD gives similar speeds, however backup speeds to DD are pretty good, about 900MB/S. The infrastructure is as follows: 2 DD2500's, DDOS5.4.0.7 NetWorker server is a windows 2012R2 server. It is also the storage node. 128G RAM, 2x 12 core CPU's. Clients are all VM's running on 4 ESX hosts and are all backed up using VBA integration. NetWork is 10G from DD to Backup server/Storage Node and ESX hosts. 1 FC LTO5 tape drive connected to backup server. Data is backed up to primary DD using Policy based VBA backups, it is then cloned to second DD. Once a month there is a clone to tape of about 25TB which takes about 2 weeks to complete. I used the Bigasm directive to test a backup of 100G file directly from the backup server to tape. This ran at around 200MB/s. The same backup to DD gave similar results. I then ran a manual clone of the backup to DD, this ran at about 40 to 50 MB/s. A restore of the same data back to the backup server gave similar speeds. From my tests it would look like writes to the DD is quite fast but reads from the DD are very slow. I appreciate that there will be some overhead for rehydration of data during a restore (or clone to tape) but I was not expecting this much. Any ideas or suggestions would be appreciated. Thanks in advance, DJ

vipin_joy · Answer

Please refer to DOC Poor Read Performance on DD2500 With Low External Shelf Count. Data Domain systems with low shelf count lack spindles/controllers preventing multiple I/O operations being performed in parallel.

Data Domain

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