[AusNOG] [AUSNOG] Disk wear & Foucault Period

Thu Aug 22 11:46:45 EST 2019

+1 Paul,  TY

I did not want to feed the TROLL

Kindly,

ROY ADAMS* | *P 07 3040 5010  | Web: http://www.racs.com.au/ | Wiki:
https://ex.racs.com.au:444/ | eMail: mailto:roy at racs.com.au
<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 :)
If you think it's expensive to hire a professional to do the job, wait
until you hire an amateur - Red Adair.
Life is a journey through a series of adventures.. Live them, love them,
hate them, but never give up on your dreams, desires, and goals.
Have you been good today? .ಠ_ಠ

On Thu, 22 Aug 2019 at 10:18, Paul Wilkins <paulwilkins369 at gmail.com> wrote:

> I think this is germane to the mail list for the following reasons:
>
> 1 - IF there is an obvious correlation between Au resident DCs with East
> West running cabinet rows and higher failure rates rather than North South
> running cabinet rows, then it should be within the ability/resources of
> this mail list to identify.
>
> Reason being, for precession purposes, Australia qualifies as Equitorial
> (as opposed to Polar). The means you minimise precession with vertical
> disks, where the disk axis points north. Because disks insert into disk
> arrays face first, this means you minimise precession with cabinet rows
> that run North/South. (ie. the cabinet rows are parallel to the disk axes).
>
> 2 - IF the correlation is real, then this is knowledge of value, due to
> improved reliability and level of service that entails. And just as
> importantly, tech time spent restoring crashed drives can be invested
> elsewhere. Thirdly, it may mean you get to extend the useful life of drive
> arrays, which will give capital and operational economies.
>
> If there's no obvious correlation, the only cost is some argument over
> noise on the list.
>
> Kind regards
>
> Paul Wilkins
>
> On Thu, 22 Aug 2019 at 08:45, andrew khoo <andrew.khoo at as136019.net>
> wrote:
>
>> i hate to be a “me too”.
>>
>> i personally believe this issue is of relevance to operators.
>>
>> in the australian context this is even more relevant due to potential
>> costs we have to incur to keep spinning rust for our compliance
>> requirements.
>>
>> maintaining a healthy lifecycle means potentially extending the useful
>> life of storage that surely an operator cannot run without.
>>
>> just my 2c.
>>
>> (and OP’s theory might mean a migration to DCs in darwin? :) :))
>>
>>
>>
>> On Thu, 22 Aug 2019 at 08:37, <andy at coastalaudio.com.au> wrote:
>>
>>> 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> 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> 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/ | Wiki:
>>> https://ex.racs.com.au:444/ | eMail: mailto:roy at racs.com.au
>>> <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 :)
>>> If you think it's expensive to hire a professional to do the job, wait
>>> until you hire an amateur - Red Adair.
>>>
>>> Life is a journey through a series of adventures.. Live them, love them,
>>> hate them, but never give up on your dreams, desires, and goals.
>>>
>>> Have you been good today? .ಠ_ಠ
>>>
>>>
>>>
>>>
>>>
>>> On Wed, 21 Aug 2019 at 11:22, Paul Wilkins <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> wrote:
>>>
>>> Easy solution , move to all flash, predicable failures and wear.
>>>
>>>
>>>
>>> Tue, 20 Aug at 4:07 pm, <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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