I just finished a smartctl long / badblocks / smartctl long on my new 6 x 3tb drives. I was about to power it on to copy my home NAS md 4x2tb RAID5 w/hot spare that almost filled up to a new RaidZ2. Then that last minute what-if started getting worse.
From my understanding RaidZ2 would stress the disks more over time and during rebuilds than an equivalent Striped Mirrors [Raid10] for a measly gain of 1/2TB usable space [20% recommended overhead].
A doubt the extra performance from the Striped Mirrors would be important. But it also allows easier future expansion. It lacks the parity recalculation overhead of RaidZ. I won't need to police the recommended space overhead with quotas. Rebuilds are much easier to recover from.
Anyone have experience with if the fault tolerance of RaidZ2 is actually more effective during rebuilds at 6 x drives than Striped Mirrors?
TL;DR: Safer rebuilds on a Raid10 [time & R/W Stress] or RaidZ2 [extra disk failure before loss]?
PS. Important data offline backup. Don't WISH to recover extraneous data on failure.
From my understanding RaidZ2 would stress the disks more over time and during rebuilds than an equivalent Striped Mirrors [Raid10] for a measly gain of 1/2TB usable space [20% recommended overhead].
A doubt the extra performance from the Striped Mirrors would be important. But it also allows easier future expansion. It lacks the parity recalculation overhead of RaidZ. I won't need to police the recommended space overhead with quotas. Rebuilds are much easier to recover from.
Anyone have experience with if the fault tolerance of RaidZ2 is actually more effective during rebuilds at 6 x drives than Striped Mirrors?
TL;DR: Safer rebuilds on a Raid10 [time & R/W Stress] or RaidZ2 [extra disk failure before loss]?
PS. Important data offline backup. Don't WISH to recover extraneous data on failure.