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Sustained throughput in a Legato NetWorker environment
I'm toying with a scenario where I want to backup several terabytes
daily in a NetWorker enviornment. Some facts, Clients: several hundred of many different OSes Data volume: about 20 TB needs to backed up during a lot less than 10 hours, I'll probably aim for 5 hours. That's 4 TB/hour or approx 1120 MB/s. I plan to use one or more virtual tape libraries as a storage device, each one can give me 300 MB/s sustained write speed. I plan to use several dedicated storage nodes. The storage nodes are backing up the clients over the LAN. I will not use a dedicated LAN segment, I don't see any point. With clever placements of storage nodes I can pull the clients over the backplane. The storage nodes will be centrally managed from a NetWorker master server, but the master server will be busy handling index and I don't want to use the master to move data as well. Question is, how many storage nodes do I need to have a combined throughput of 1120 MB/s. I can probably trunk a few GbitE connections, but do I trunk 2 and hope for ~150 MB/s or can I go with even 4 GbitE and hope for ~300MB/s. In any case I want to use x86 hardware and scale out instead of buying some huge box and scale up. OS on these boxes is a pretty open subject, but something tells med Linux would a be good choice. These boxes are truly dedicated for the task, they will not be running any other applications. Could I hope for a 4x Gig trunk on a 2 CPU machine, some AMD dual core variety are dirt cheap these days. On the backend I'll use 4Gbit Fibre Channel to stream the data to the VTL. |
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