Hello,
I have a brand new MacMini to which I connect a Promise R4 array with 4x 1 TB disks with thunderbolt. Al are in passthrough mode and put into a raidz pool. I'm transferring files from my previous machines with rsync. While the performance is to me acceptable, every now and then the whole pool stall for a few seconds with various clicks been heard from the disks (calibration?). I could do with this except that sometimes, the whole pool disappear completely. zpool does not see it and neither does the control panel extension. Only reboot from the machine and/or the Promise can fix this.
Any idea? Could it be a Promise issue or a ZFS one? I'm still not sure which.