Disks, unlike software, sometimes fail. Using redundancy can help
modern SATA drives fail VERY often. about 30% of drives i bought recently
failed in less than a year.
both checksum on and copies > 1 on, and the latter isn't the
default. It's probably better to let zpool provide the redundancy via
a mirror or raid configuration than to let zfs do it anyway.
ZFS copies are far from what i consider useful.
for example you set copies=2. You write a file, and get 2 copies.
Then one disk with one copy fails, then you put another, do resilver but
ZFS DOES NOT rebuild second copy.
You need to write a program that will just rewrite all files to make this.
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