Tim Cook <tim <at> cook.ms> writes: > > Whats the point of arguing what the back-end can do anyways? This is bulk data storage. Their MAX input is ~100MB/sec. The backend can more than satisfy that. Who cares at that point whether it can push 500MB/s or 5000MB/s? It's not a database processing transactions. It only needs to be able to push as fast as the front-end can go. --Tim
True, what they have is sufficient to match GbE speed. But internal I/O throughput matters for resilvering RAID arrays, scrubbing, local data analysis/processing, etc. In their case they have 3 15-drive RAID6 arrays per pod. If their layout is optimal they put 5 drives on the PCI bus (to minimize this number) & 10 drives behind PCI-E links per array, so this means the PCI bus's ~100MB/s practical bandwidth is shared by 5 drives, so 20MB/s per (1.5TB-)drive, so it is going to take minimun 20.8 hours to resilver one of their arrays. -mrb _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
