[evla-sw-discuss] Filehost replacement date proposal (January 1st noon - 4pm)

[Joseph P. McMullin]

Hi James,
Agreed the 1st seems attractive; the only issue is perhaps whether it is
worthwhile to have someone at
the site (e.g., an operator) a bit earlier in the process in case there's a
snag that requires local hands.
Gene/Peggy - would this be hard/prohibitive?
Alternatively, we can just say that we're not expecting to get started with
science observations until 1800
at the earliest (=2 hours after we have operator support on site; assumes 1
hour of potential interaction
with James' group and then at least another hour for testing/setup for
science observing).
Joe

On Mon, Nov 29, 2010 at 1:59 PM, James Robnett <jrobnett at aoc.nrao.edu>wrote:

>
>   After a bit of debate we're now leaning toward doing the
> filehost replacement Saturday January 1st assuming all the
> various parties are amenable.
>
>   During a filehost replacement every Linux box needs to be
> down or at least rebooted at very specific times (plural) to
> get around stale NFS filehandle issues and general lack of
> infrastructure servers.  That includes all linux systems at
> the EVLA and VLBA ops machines (but not VLBA site machines).
>
>   The scheduling has been heavily influenced by a desire to
> avoid affecting normal work hours and EVLA observing.  Since
> we're not observing part of the 1st anyway the 1st seems to fit
> the bill.
>
>   What we'd propose is scheduling it for something like noon
> to 4pm.  The late start is designed to give folks a chance
> to recover from a potentially late night and more importantly
> coincide with the operator availability at 4pm.
>
>   I suspect we'll be done sometime before 3pm and spend the
> next hour or so checking systems at which point we can hand
> things over to Ops for checking at 4pm.
>
>   Right now everything's tentative but I wanted to bounce this
> off folks that might need to do be involved to ensure proper
> restart of Widar and M&C systems as well as VLBA ops.
>
>   The alternative suggestions have been the evening of the
> 29th (front end of double maintenance day) or during the day
> some other time.
>
> Personally the 1st seems like the best option.
>
> james
>
>


-- 
Dr. Joseph P. McMullin
EVLA
Ph: +1 575 835 7315
E-mail: jmcmulli at nrao.edu
http://science.nrao.edu/evla/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listmgr.nrao.edu/pipermail/evla-sw-discuss/attachments/20101129/75c74781/attachment.html>