A new data center has been built at Nikhef. The existing grid infrastructure at Nikhef will be moved to this new data center between 10 August and 21 August. During the migration process, grid services will be unavailable.

This large-scale operation will take place in two phases:

1) Moving grid services and network infrastructure (10-14 August 2009) During this phase, all grid services at site NIKHEF-ELPROD will be unavailable. For grid users this means that the following services cannot be used: - Computing services (CEs gazon.nikhef.nl and trekker.nikhef.nl); - Storage services (SE tbn18.nikhef.nl); - Job submission services (WMS graszode.nikhef.nl, graspol.nikhef.nl, dorsvlegel.nikhef.nl); - Requesting renewal of grid certificates via the Dutchgrid CA web site will not be possible at 10 and 11 August (requests can be submitted via mail but will not be processed); - The web sites www.dutchgrid.nl, www.vl-e.nl and poc.vl-e.nl will be unavailable.

2) Moving compute and storage clusters (15-21 August 2009) In this phase, the computing and storage clusters will be unavailable. Grid users will not be able to: - Use the computing services (CEs gazon.nikhef.nl and trekker.nikhef.nl); - Access certain data files via SE tbn18.nikhef.nl.

We advise all users of the grid infrastructure to: - Request renewal of grid certificates before August 5th (only if the certificate will expire early or mid-August); - Use the grid computing services at SARA (CE ce.gina.sara.nl) - Submit grid jobs via the WMS at SARA (WMS wms.grid.sara.nl) - Plan their work such, that no access is required to data files via storage element tbn18.nikhef.nl, or to copy relevant data elsewhere.

Kind regards, Ronald Starink