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Obviously some of the dates below are tentative. We will update users as and when we have more certainty about progress. 


Timetable of System Session starting on 8 September

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DateTime (UTC)Event ImpactUser action

8 Sep

09:30

Start of DHS Move

Change configuration of all services using MARS/ECFS to point to the temporary DHS in Bologna. 


Check service status
09:30 - 10:30Drain all MARS/ECFS activity in DHS infrastructure in Reading All active/queued MARS retrieve requests and ECFS get operations on the DHS in Reading will fail.Please re-run to test behaviour expected during DHS Move. 

w/c 12 Sep


MARS/ECFS/HPSS metadata transfer to Bologna.

Start DHS infrastructure in Bologna (DHS-Blank)

Short interruption.

Stop writing new data into temporary-DHS and start archive/store to production MARS/ECFS in Bologna. 

Check service status

from 14 Sep

Physical relocation starts:  tapes, tape libraries, disks, servers start being shipped to Bologna



w/c 3 Oct

First data started appearing in Bologna:

  • 6,500 tapes from Reading loaded into existing Bologna libraries
  • 1.2 PiB disk cache of popular data 
Short interruptions

The type of data becoming available:

  • all S2S dataset
  • popular data from Reading disks on marsod (operational data, class=od)

Try resuming work for the above. Failures may occur as not all streams/types/levtypes are available.


w/c 10 Oct

Three Reading tape libraries (out of 5) re-assembled in Bologna put in production:

  • totalling 16,500 Reading tapes made available (out of 21,900)

Additional 1.5 PiB disk cache of popular data

Short interruptions

The type of data becoming available:

  • popular data from Reading disks on marser (eg, ERA5, CAMS, ...).
  • 75% of the Archives from tape should become available

Try resuming work for the above. Failures may occur as not all class/streams/types/levtypes are available.

w/c 17 24 Oct

The first of five tape libraries shipped from Reading to Bologna was put in production on . This provides access to additional 4,000 tape cartridges, mostly operational data.


The type of data becoming available:

  • 50% of the Archives from tape is available


w/c 31 Oct

Three additional tape libraries were put in production this week.


System sessions on tape libraries required

The type of data becoming available:

  • More than 85% of the Archives from tape is available:
    • MARS: 283 out of 339 PiB of data available
    • ECFS: all 125 PiB, 100% available
  • Most operational data and e-suite data (class=od) available (except few tapes containing enfo/pf and oper/fc)

Users are encouraged to resume their work, noting that some RD, Re-Analysis and TIGGE data may still be unavailable.

w/c 7 Nov
One tape library left to complete the DHS MoveSystem sessions on tape libraries requiredCheck service status

 


End of DHS Move 

Delays in the connectivity of the Reading tape libraries meant we could not put any in operation last week.

Remaining five Reading tape libraries re-assembled in Bologna put in production:

End of DHS Move (depending on all above)		Access to full MARS/ECFSCheck service status

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