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Maximum tape tape throughput of NBU 5220 appliance

perry_wilson
Level 2
Employee Accredited

Does anyone have test info on the maximum recommended number of tape drives that can be SAN connected to a NBU 5220?

Max throughput to one drive or all drives that can be expected?

Any recommendations on how many HBAs would be needed to maximize throughput?

2 REPLIES 2

Jeff_Foglietta
Level 5
Partner Accredited Certified

On a 5220 only slot 3 can be used for tape out so that effectively limits your number of HBA's . That being said there are two cards available.A 4GB card and an 8GB card. Knowing you have but one card available for tape out a little math can tell you the throughput and performance you will have depending on the specifications of the tape devices you have.

Chad_Wansing2
Level 5
Employee Accredited Certified

so the typical limiting factor is one that all OST devices have to contend with.......that you can only do a single duplication job to a given tape device and that data stream tends to be limited more by the dedupe codes ability to rehydrate the data to the tape device than anything else.  In my experience I've seen rehydration to tape run as fast as 150MB/s and we can support that to multiple simultaneous drives due to how the duplication jobs get threaded through the processor........long story short, we tend to top out at about 150MB/s per stream but can support that speed across multiple duplication streams.  With that said it really comes down to how many tape drives you have as that determines the max number of simultaneous duplications we can spawn, but regardless the 8gig FC links are going to be the least of your worries.