andy liebman wrote: > ...
By the way, I use 3ware 9550SX cards. On a 16 drive RAID-5 SATA array, I can get sequential reads that top 600 MBs/sec. That's megabytes, not megabits. And write speeds are close to 400 MB/sec with the new faster on-board XOR processing. And random reads are at least 200 MB/sec. So, 10 GbE is a must, really.
A 400MB/s network input stream means either 1x10GbE or 4xGbE's to PCI-X/PCI-e bus, then to disk, then to PCI-X/PCI-e bus, then across another net to the backup system, so the I/O subsystem alone must handle 800MB/s.
3ware may actually do a single 400MB/s stream, but what about 4x100MB/s or 8x50MB/s? It's really hard to do that much I/O _and_ provide data integrity. If your data rates and the mirroring requirements are that critical you might want to look at the fast NAS systems coming out (eg- agami.com) built on top of AMD's HT architecture.
Cheers,
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