On 26/02/17 22:37, Reindl Harald wrote:
since in recent news i saw that convert several raid-levels with respahe is possible now is it somehow possible to change a existing md RAID10 array from "2 near-copies" to "2 far-copies" and what would be the mdadm syntax? the IO intense workload here are large reads within virtual disks and as far as i can see far-layout would here be the better option but as installed the stuff in 2011 not sure if anaconda even offered that in the OS installer
Far layout will significantly improve read performance, however it will also significantly impact write performance. You really want to spool up a test system and benchmark the performance in your specific application before considering changes like this. The write performance degradation on magnetic media is significant due to the extra seeking required.
As you've already discovered. It's a backup and restore exercise on RAID10. Regards, Brad -- 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
