Stefan Parvu sparvu at kronometrix.org
Fri Feb 22 20:40:16 UTC 2019

Thanks all for comments. I need to dedicate time to play around with ZFS 
and RBPI3. 


Stefan Parvu
sparvu at kronometrix.org

> On 22 Feb 2019, at 20.56, Peter Jeremy <peter at rulingia.com> wrote:
> On 2019-Feb-22 11:47:37 -0600, Karl Denninger <karl at denninger.net> wrote:
>> Uh uh.  Yes, a scrub (or just checksum check on the read) will catch the
>> "aw crap!" situation where write amplification and read/rewrite hoses
>> you during a power failure but there's nothing zfs can do to fix it
>> since there's no second copy available.
> That's not completely true.  By default ZFS stores 2 copies of most
> metadata and can be configured to store up to 3 copies (on top of pool
> redundancy) of all data (check the "copies" and "redundant_metadata"
> properties of the filesystem).  Obviously, if all the copies are on
> one device, it won't help if the device bricks itself or all the
> copies wind up on the corrupt sectors but it can help recovering from
> a glitch that took out a page or two.  (It would also be possible to
> setup a ZFS mirror between a SDcard and a USB flash stick).
> -- 
> Peter Jeremy

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