During my talk, I spoke briefly about upgrading one of my machines from 3TB disks to 4TB disks. Here's a "zfs status" output (obviously with some critical details scrubbed) This is a raid 60 (4, 8 disk raid 6's). I'm replacing 4 disks, one from each of the strip sets. What I captured this output I'd just put in the fourth disk. So that 252h is now down to 15h, and likely soon it'll be even lower. Obviously, I/O load on the subsystem will cause this to stretch out. Note the "New Disk" labels were added for emphasis. bash-4.2# zpool status XXXXXX pool: XXXXXXX state: DEGRADED status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the resilver to complete. scan: resilver in progress since Wed Jul 8 10:30:22 2015 945M scanned out of 11.9T at 13.7M/s, 252h54m to go 945M scanned out of 11.9T at 13.7M/s, 252h54m to go 110M resilvered, 0.01% done config: NAME STATE READ WRITE CKSUM XXXXX DEGRADED 0 0 0 raidz2-0 DEGRADED 0 0 0 c3t5000C500637AADD3d0 ONLINE 0 0 0 replacing-1 DEGRADED 0 0 0 c3t5000C50064E9441Fd0 FAULTED 1 166 0 too many errors c3t5000C500637875EBd0 ONLINE 0 0 0 (resilvering) <---- New Disk c3t5000C5004DFE165Ad0 ONLINE 0 0 0 c3t5000C5004E0F3A80d0 ONLINE 0 0 0 c3t5000C5004E1B6EE1d0 ONLINE 0 0 0 c3t5000C5004E23870Bd0 ONLINE 0 0 0 c3t5000C5004E2AC08Fd0 ONLINE 0 0 0 c3t5000C5004E2AE946d0 ONLINE 0 0 0 raidz2-1 DEGRADED 0 0 0 c3t5000C500637879E7d0 ONLINE 0 0 0 replacing-1 DEGRADED 0 0 0 c3t5000C5004E2B1B22d0 FAULTED 139 222 0 too many errors c3t5000C500637ACF67d0 ONLINE 0 0 0 (resilvering) <------ New Disk c3t5000C5004E2BE74Dd0 ONLINE 0 0 0 c3t5000C5004E2BEA7Fd0 ONLINE 0 0 0 c3t5000C5004E2C0B84d0 ONLINE 0 0 0 c3t5000C5004E2C5397d0 ONLINE 0 0 0 c3t5000C5004E2D0C39d0 ONLINE 0 0 0 c3t5000C5004E2D1F13d0 ONLINE 0 0 0 raidz2-2 DEGRADED 0 0 0 replacing-0 DEGRADED 0 0 0 c3t5000C5004E2D48F6d0 UNAVAIL 0 4 0 cannot open c3t5000C500637933B3d0 ONLINE 0 0 0 (resilvering) <----- New Disk c3t5000C5004E2D58DAd0 ONLINE 0 0 0 c3t5000C5004E2D0821d0 ONLINE 0 0 0 c3t5000C5004E2D3220d0 ONLINE 0 0 0 c3t5000C5004E2D3749d0 ONLINE 0 0 0 c3t5000C5006A581C22d0 ONLINE 0 0 0 c3t5000C5004E25DFFFd0 ONLINE 0 0 0 c3t5000C5004E129273d0 ONLINE 0 0 0 raidz2-3 DEGRADED 0 0 0 replacing-0 DEGRADED 0 0 0 c3t5000C5006A582FE8d0 FAULTED 146 130 0 too many errors c3t5000C50063747E77d0 ONLINE 0 0 0 (resilvering) <----- New Disk c3t5000C50064D9AB36d0 ONLINE 0 0 0 c3t5000C50064D98E37d0 ONLINE 0 0 0 c3t5000C50064DF7F04d0 ONLINE 0 0 0 c3t5000C50064DFAE39d0 ONLINE 0 0 0 c3t5000C50064E3CBE0d0 ONLINE 0 0 0 c3t5000C50064E401FEd0 ONLINE 0 0 0 c3t5000C5004DE878BAd0 ONLINE 0 0 0 errors: No known data errors bash-4.2# Thanks, Tim. -- I am leery of the allegiances of any politician who refers to their constituents as "consumers".