On Thu, Jul 21, 2011 at 08:03:58PM -0400, Ellis H. Wilson III wrote: > Used in a backup solution, triplication won't get you much more > resilience than RAID6 but will pay a much greater performance penalty to > simply get your backup or checkpoint completed.
Hey, if you don't see any benefit from R3, then it's no surprise that you find the cost too high. Me, I don't like being woken up in the dead of the night to run to the colo to replace a disk. And I trust my raid vendor's code less than my replication code. > Additionally, unless you have a ton of these boxes you won't get > some of the important benefits of Hadoop such as rack-aware > replication placement. Most of the benefit is achieved from machine-aware replication placement: the number of PDU and switch failures is much smaller than the number of node failures, which is much smaller than the number of disk device failures. -- greg _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
