ZFS scrub on new disks gives cksum errors

[Karl Denninger]

Stepped-wave ups power is perfectly fine to feed a switching power supply -- in fact most run COOLER on it than on sine wave power!

-- Karl
(On Passport PDA)
  Original Message  
From: Brian N
Sent: Monday, December 8, 2014 20:11
To: Sean Chittenden
Cc: freebsd-fs at freebsd.org
Subject: Re: ZFS scrub on new disks gives cksum errors

On Mon, Dec 08, 2014 at 09:09:51AM -0800, Sean Chittenden wrote:
> I had this exact problem at home on my FreeNAS host when a box is plugged
> in to residential power that is "not clean." If you plug this host in to a
> UPS it should clear things up instantly (find a sine wave UPS, not a
> digital stepping supply). There's something about the fluctuating power or
> brownouts that ZFS is well suited to detecting (and became terrifying to me
> because wtf happened in the past pre-ZFS??).
> 
> -sc

Interesting. I have a UPS (APC Back-UPS ES 550 (stepped)) on the same circuit
(residential power) that routinely gives me power outage messages where an
outage lasts 1-2 seconds. Other electrical devices (lights, etc) are not
affected and I just thought that the UPS was very sensitive. Thanks for the
reply.
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