ZFS on Hardware RAID

[Xin Li]

On 1/20/19 13:33, Andriy Gapon wrote:
> On 20/01/2019 17:41, Ben RUBSON wrote:
>> ZFS does not really make sense with only one disk (what's the checksum
>> benefit once it has failed ?), you could go with any other FS...

With checksums, you can tell if a file is corrupted.  On traditional
filesystems, you can only tell when there is built-in integrity checks,
or you actually notice the file getting garbled (and it's probably too
late at the time).

> There is 'copies' property, though...

Also multiple copies of critical metadata is stored by default.  I
actually got saved on an old laptop (crappy hardware, no ECC RAM, etc.)
a few years ago, copying the disk to the replacement and a 'zpool scrub'
corrected everything for me.

It's not a replacement for an up-to-date backup, and it won't save you
from a dead disk, but it can be very helpful for "usual" situations
where you have a backup from a few days ago and a hard drive that is not
totally dead, yet.

Cheers,

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