Add ZFS setup info

doc/fetlab.md

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+# fetlab
+## Setup ZFS
+```shell
+for i in a b c d e f g h i; do echo -n "/dev/sd$i: "; hdparm -I /dev/sd$i | awk '/Serial Number/ {print $3}'; done
+lsblk
+sgdisk -n1:0:0 -t1:BF01 /dev/sda
+sgdisk -n1:0:0 -t1:BF01 /dev/sdb
+cryptsetup luksFormat /dev/disk/by-id/ata-ST4000VN008-2DR166_ZDH35RRA-part1
+cryptsetup luksFormat /dev/disk/by-id/ata-ST4000VN008-2DR166_ZDH469JD-part1
+zfs_mount.sh mount
+zpool create -o ashift=12 -o autoexpand=on -o autoreplace=on -O atime=off -O compression=lz4 -O acltype=posixacl -O xattr=sa lab mirror /dev/mapper/ata-ST4000VN008-2DR166_ZDH35RRA-part1 /dev/mapper/ata-ST4000VN008-2DR166_ZDH469JD-part1
+/sbin/zpool scrub lab
+zfs create lab/rec
+mkdir /var/lib/motioneye
+zfs create -o mountpoint=/var/lib/motioneye lab/rec/motion
+```
+## Get video input resolutions
+```shell
+ffmpeg -f video4linux2 -list_formats all -i /dev/video0
+```