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GRIDPP-STORAGE  January 2012

GRIDPP-STORAGE January 2012

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Subject:

Re: DPM upgrade and migration procedure

From:

Elena Korolkova <[log in to unmask]>

Reply-To:

Elena Korolkova <[log in to unmask]>

Date:

Thu, 19 Jan 2012 17:27:08 +0000

Content-Type:

text/plain

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Not finally decided yet. preliminary  is Feb 6-8.

Elena

On 19 Jan 2012, at 17:02, Ben Waugh wrote:

> Can you remind me when the LFC downtime is scheduled? I got it confused with yesterday's ADC outage.
> 
> Ben
> -- 
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
> 
> Sam Skipsey <[log in to unmask]> wrote:
> Certainly. We're planning on looking at one or two infrastructure changes at this time for that very reason.
> 
> Sam
> 
> On 19 January 2012 15:01, Christopher J.Walker <[log in to unmask]> wrote:
> On 19/01/12 14:40, Wahid Bhimji wrote:
> >
> > OK Ben -
> >
> > given the weight of concurring - and given I don't recall that I for
> > sure have tried this then I am not confident enough to buck the trend.
> >
> > Perhaps you should indeed migrate over and then run yaim once only with
> > the new setup as desired.
> >
> > I am determined to try this now and see whether it does indeed cause
> > weird behaviour so will report back but maybe not on your timescales.
> 
> Remember that the ATLAS LFC (and therefore presumably ATLAS in the UK)
> is going to be down for the LFC update fairly soon. That would be a good
> time to do the update with little time pressure.
> 
> Chris
> 
> > Wahid
> >
> > On 19 Jan 2012, at 13:57, Sam Skipsey wrote:
> >
> >> I concur with Matt and Ewan.
> >>
> >> An hour or so of downtime is not worth the risk.
> >>
> >> Sam
> >>
> >> On 19 January 2012 13:50, Matt Doidge <[log in to unmask]
> >> <mailto:[log in to unmask]>> wrote:
> >>
> >>     > I wouldn't risk it, and while I never 100% proved it, I'm
> >>     > moderately sure that running YAIM on a machine with a
> >>     > temporary name/IP address was one of the things that gave
> >>     > me so much grief when I tried this a while back. Some of
> >>     > the mysql permissions are done by hostname, and it doesn't
> >>     > always seem to use 'localhost'.
> >>     >
> >>     > I would be safe, declare a long enough downtime, and make
> >>     > sure the old machine is well out of the way before you bring
> >>     > the new one up, and give it the correct hostname from the
> >>     > get-go. Also, bear in mind that doing a database dump/reload
> >>     > takes a while, so it's not like you're going to be able to
> >>     > switch quickly from the old box to the new box anyway.
> >>
> >>     I agree with Ewan, I'm not sure the hour or two of reduced downtime is
> >>     worth the risk of things "going wierd" (and that's all you're going to
> >>     save provided everything goes to plan). I've also seen wierd behaviour
> >>     on boxes that I thought might have been caused by running yaim when it
> >>     had the wrong hostname/IP.
> >>
> >>     Cheers, and Good Luck!
> >>     Matt
> >>
> >>
> >
> >
> >
> > The University of Edinburgh is a charitable body, registered in
> > Scotland, with registration number SC005336.
> 

__________________________________________________
Dr Elena Korolkova
Email: [log in to unmask]
Tel.:  +44 (0)114 2223553
Fax:   +44 (0)114 2223555
Department of Physics and Astronomy
University of Sheffield
Sheffield, S3 7RH, United Kingdom

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