[AusNOG] [AUSNOG] Disk wear & Foucault Period

Thu Aug 22 08:37:21 EST 2019

Excuse my apparent naivety, but I thought data centres were attached to networks? It’s apparent that only DevOps engineers are allowed to think scientifically, unlike the rest of us mere mortals. I’m sure that I’m not the only one that found Paul’s theorising quite interesting…or has the inherent Luddite atmosphere of stifling creative thought in this country now permeated into the Technosphere…?

From: AusNOG <ausnog-bounces at lists.ausnog.net> On Behalf Of James Hodgkinson
Sent: Wednesday, 21 August 2019 6:36 PM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] [AUSNOG] Disk wear & Foucault Period

Please stop thinking out loud, this is the quiet carriage. 

James

On Wed, 21 Aug 2019, at 17:17, Paul Wilkins wrote:

Another thought, which is that horizontal mounting is optimal for polar regions, whereas you minimise precession at equitorial latitudes with vertical mounting (but only if the axis is north aligned), which could go some way to explaining the anecdotal stuff you hear about horizontal versus vertical mounting. Though I've yet to hear anyone asking what's your latitude before they proceed to build a data centre or installing your vertical disks arrays to be north axis aligned.

Kind regards

Paul Wilkins

On Wed, 21 Aug 2019 at 16:31, Mark Smith <markzzzsmith at gmail.com <mailto:markzzzsmith at gmail.com> > wrote:

How is this related to network operation? AusNOG - Australian Network Operators Group.

You wouldn't go to a car show to ask about motorbikes - you'd to to a motorbike show, because that's where the most people interested in and having the most knowledge about motorbikes would be.

On Wed, 21 Aug 2019 at 15:30, Roy Adams <roy at racs.com.au <mailto:roy at racs.com.au> > wrote:

Paul, I would be most interested if you hear back from them.

I am curious if even BackBlaze have considered your idea in the past.. maybe a wake up for them and others

FYI, they produce these reports each quarter - worth calendaring to pick up.

I was stunned at the 14TB Toshiba reliability... interestingly, 2 weeks ago that top line read 0 failures... today it says 1 - v.strange

Kindly,

ROY ADAMS | P 07 3040 5010  | Web:  <http://www.racs.com.au/> http://www.racs.com.au/ | Wiki:  <https://ex.racs.com.au:444/> https://ex.racs.com.au:444/ | eMail:  <mailto:roy at racs.com.au> mailto:roy at racs.com.au

Please never upgrade to the latest Windows 10 - You don’t need the hassle, and I don’t need the work.

More seriously, the 6 month older Windows 10 releases are typically FAR MORE stable - a simple RACS script can fix this - just ask :)
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On Wed, 21 Aug 2019 at 11:22, Paul Wilkins <paulwilkins369 at gmail.com <mailto:paulwilkins369 at gmail.com> > wrote:

Roy,

Those are the most comprehensive disk stats I've ever seen.

So out of curiosity, I emailed Backblaze to ask if they'd noticed any latitudinal effect on disk wear. Not realistically expecting a response, but if they did notice a correlation, it may perhaps emerge by osmosis.

Karl, I have to think turning a 15K RPM on it's head over a, admittedly long period, has to have an effect. Cumulatively you're going to get uneven wear on the bearings. Also the wear is going to be strongly non linear. Even if it's not a factor today due to current production tolerances and HVAC, it must become a factor eventually, though maybe not necessarily in our lifetime.

Kind regards

Paul Wilkins

On Tue, 20 Aug 2019 at 19:59, Peter Betyounan <peter.betyounan at serversaustralia.com.au <mailto:peter.betyounan at serversaustralia.com.au> > wrote:

Easy solution , move to all flash, predicable failures and wear. 

Tue, 20 Aug at 4:07 pm, <paulwilkins369 at gmail.com <mailto:paulwilkins369 at gmail.com> > wrote:

Has anyone ever noticed a pattern of disks in equatorial latitudes lasting significantly longer than say Sydney or Melbourne? I notice the Foucault Period for Brisbane is 52hrs vs Melbourne's 39hrs and can't but wonder if this doesn't mean Brisbane based DCs will have their disks last 30% longer, or Darwin x3.

Kind regards

Paul Wilkins

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