Ok, so I have my 16TB raidz2 ZFS pool now (running across 8 disks). First, the performance on the thing is abysmal. Sometimes when you type 'ls' it takes over a second to respond. I use the thing as a media center and when you hit Play on a video or music there's a huge delay before anything starts, not to mention seeking on large files. Now I know that when you just build a RAID array with mdadm it lets you use it right away even though it's actually still building the array, and I thought maybe ZFS does that, too, which is degrading the performance. But zpool status doesn't show any info about that, so I'm wondering if this kind of performance is temporary or not, and how to determine that... Second, I've had three "One or more devices has experienced an unrecoverable error." Each has been on a different drive. I don't know how to check /what/ the error was, though. Now, each and every one of these drives has gone through a 3+ day badblocks and come out with zero/zero/zero errors. Two of those errors have been on drives I've been using in my previous mdadm array with no errors whatsoever for 6 months. Is there any way to get a more... informative idea of what exactly error is being encountered. Anyone? --