[Halld-offline] /work/halld3: transition to new server on Thursday morning

[Mark Ito]

Reminder: this happens tomorrow (Thu.) at 9 am...

On 8/31/21 11:41 AM, Mark Ito wrote:
>
> Folks,
>
> Recall that during the transition of /work/halld to a new server a 
> couple of weeks ago, /work/halld3 was left alone. SciComp is now ready 
> to move /work/halld3 to a subdirectory of /work/halld3. Links will be 
> installed so that the path /work/halld3 will continue to find the same 
> files as it did in the past, but the physical location of those files 
> will have changed. And any path starting with /w/halld-sciwork18, 
> which does work now, will not work after the transition (it may 
> resolve to a read-only file system at first before disappearing 
> permanently).
>
> *The cut-over will happen between 9 am and 10 am (approximately) 
> Thursday, September 2 (day after tomorrow)*. During this time the 
> files on /work/halld3 will be unavailable.
>
> One technical point: the majority of files have already been 
> transferred to their new home. The outage is to transfer files that 
> will have recently appeared on the old server to the new. At that 
> point write access to the old server will be removed so that no more 
> new files are created. To make this final transfer go faster, we want 
> to minimize the volume of "new" files on the old server. So for the 
> next couple of days, before the switch, please try to limit the volume 
> of new files being written to /work/halld3. Said another way, please 
> refrain from dumping multi-terabyte datasets to /work/halld3 until 
> after the transition.
>
>   -- Mark
>
>
>
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