On 2016-07-30 20:12 (-0700), Shady Xu <[email protected]> wrote: > Thanks Andrew, I know about the disk failure risk and that it's one of the > reasons why we should use JBOD. But JBOD provides worse performance than > RAID 0.
It's not about failure: it's about speed. RAID0 performance will drop like a rock if any one disk in the set is slow. When all the drives are performing at peak, yes, it's definitely faster. But over time, drive speed will decline (sometimes to half speed or less!) usually prior to a failure. This failure may take a while, so in the mean time your cluster is getting slower ... and slower ... and slower ... As a result, JBOD will be significantly faster over the _lifetime_ of the disks vs. a comparison made _today_. --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
