dd1dd1

Some details. OS is CentOS-7, kernel 3.10.0-1062.12.1.el7.x86_64, zfs-0.8.3-1. Problem disks: # ./smart-status.perl Disk model serial temperature realloc pending uncorr CRC err RRER /dev/sda WDC WDS100T2B0A-00SM50 195004A00B9C 26 . ? ?...

shodashok - failing hdd: no (this is an ssd), failing ssd: unlikely: (a) ssd is brand new, (b) failing devices usually throw read/write i/o errors, not "illegal request - unaligned...

additional information: moved the two problem ssds to different sata ports, now both report physical sector size 512. (one was reporting 4096). Now let's see if the errors go away....

That's interesting. My "unaligned write" errors have gone away after I moved the disks from an oldish socket 1366 mobo and a brand new socket 1151 mobo. It could have...