Hoi,
It is great news to understand the level of our ability to switch over. I
am impressed and yes, it can and will improve but this is good to hear and
understand.
Thanks,
GerardM
On 9 April 2017 at 03:39, zppix e <[email protected]> wrote:
>
>
>
> > From: Faidon Liambotis <[email protected]>
> > Date: April 7, 2017 at 8:58:09 AM CDT
> > To: Wikimedia developers <[email protected]>
> > Subject: [Wikitech-l] eqiad->codfw datacenter switchover, weeks of Apr
> 17th/May 1st
> > Reply-To: Wikimedia developers <[email protected]>
> >
> > Hi all,
> >
> > You may have heard already that, like last year, we are planning to
> > switch our active datacenter from eqiad to codfw in the week of April
> > 17th and back to eqiad two weeks later, on the week of May 1st. We do
> > this periodically in order to exercise our ability to run from the
> > backup site in case of a disaster, as well as our ability to switch
> > seamlessly to it with little user impact.
> >
> > Switching will be a gradual, multi-step process, the most visible step
> > of which will be the switch of MediaWiki application servers and
> > associated data stores. This will happen on April 19th (eqiad->codfw)
> > and May 3rd (codfw->eqiad), both at 14:00 UTC. During those windows, the
> > sites will be placed into read-only mode, for a period that we estimate
> > to last approximately 20 to 30 minutes.
> >
> > Furthermore, the deployment train will freeze for the weeks of April
> > 17th and May 1st[1], but operate normally on the week of April 24th, in
> > order to exercise our ability to deploy code while operating from the
> > backup datacenter.
> >
> > 1: https://wikitech.wikimedia.org/wiki/Deployments
> >
> > Compared to last year we have improved our processes considerably[2], in
> > particular by making more services operate in an active/active manner,
> > as well as by working on an automation and orchestration framework[3] to
> > perform parallel executions across the fleet. The core of the MediaWiki
> > switchover will be performed semi-automatically using a new software[4]
> > that will execute all the necessary commands in sequence with little
> > human involvement, and thus lowering the risk of introducing errors and
> > delays.
> >
> > 2: https://wikitech.wikimedia.org/wiki/Switch_Datacenter
> > 3: https://github.com/wikimedia/cumin
> > 4: https://github.com/wikimedia/operations-switchdc
> >
> > Improving and automating our processes means that we're not going to be
> > following the exact same steps as last year. Because of that, and
> > because of other changes introduced in our environment over the course
> > of the year, there is a possibility of errors creeping into the process.
> > We'll certainly try to fix any issues that arise during those weeks and
> > we'd like to ask everyone to be on high-alert and vigilant.
> >
> > To report any issues, please use one of the following channels:
> >
> > 1. File a Phabricator issue with project #codfw-rollout
> > 2. Report issues on IRC: Freenode channel #wikimedia-tech (if urgent, or
> > during the migration)
> > 3. Send an e-mail to the Operations list: [email protected] (any
> time)
> >
> > Thanks,
> > Faidon
> > --
> > Faidon Liambotis
> > Principal Operations Engineer
> > Acting Director of Technical Operations
> > Wikimedia Foundation
> >
> > _______________________________________________
> > Wikitech-l mailing list
> > [email protected]
> > https://lists.wikimedia.org/mailman/listinfo/wikitech-l
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