Janek Kozicki wrote:
* two 6 disks raid10 arrays : theoretical max speed 6 times single disc * three 4 disks raid10 arrays : theoretical max speed 4 times single disc * single raid10 far=2 : theoretical max speed 12 times single disc (!) isn't that true?
If speed is raw throughput then that's approximately right. Unless you're streaming huge piles of data, that sort of speed isn't what you need to tune for, though. Look at it this way:
two 6 disk raid 10 arrays : theoretical max seeks per operation: 6 times the seeks of a single disk
three 4 disk raid 10 arrays: theoretical max seeks per operation: 4 times the seeks of a single disk
one 12 disk raid 10 arrays: theoretical max seeks per operation: 12 times the seeks of a single disk!
Seeks are bad. You have to tune for your workload. -- Brendan Conoboy / Red Hat, Inc. / blc@xxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
