ZFS regimen: scrub, scrub, scrub and scrub again.

[Steven Chamberlain]

On 22/01/13 19:28, Chris Rees wrote:
> On 22 January 2013 19:01, Zaphod Beeblebrox <zbeeble at gmail.com> wrote:
>> On Tue, Jan 22, 2013 at 4:11 AM, Adam Nowacki <nowakpl at platinum.linux.pl>wrote:
>>> This is what was in my wall: http://tepeserwery.pl/DSC_0178.JPG
>>>
>> Damn, son.  That socket is obviously not rated for whatever you used it
>> for.
> 
> That is a standard European socket, which are normally rated at 13A.

Maybe they don't work very well with paint splattered inside them.

My guess is the paint was slightly metallic or conductive, so a current
was flowing between one of the screw terminals on the right, and the
bolt in the mounting bracket (which is probably earthed).

The socket may have been supplying a lower voltage as a result, hence
the equipment suffering brownouts.  (But it seems the UPS wasn't
sensitive enough to this?)

Ideally a circuit breaker would have tripped before anything got hot
enough to melt, but in this case the heat in the right-hand-side rail
(in a wall, with no air circulation) became enough to discolour the
plastic.  I think it's lucky it didn't cause a fire.

In the UK most house/office socket circuits are supposed to be protected
by an RCD, which are extremely sensitive to fault currents like this
flowing to earth.

If there are any more sockets in that room/building I would definitely
check all of them!  (Carefully, with the supply disconnected, of
course).  Or an insulation/leakage test of the circuit by an electrician
would have detected this.

> checksum errors on multiple
> disks, all fixed thanks to raidz2.

Well, that's some relief :)

Regards,
-- 
Steven Chamberlain
steven at pyro.eu.org