Speaker
H. Meinhard
(CERN-IT)
Description
By 2008, the T0/T1 centre for the LHC at CERN is estimated to use
about 5000 TB of disk storage. This is a very significant increase
over the about 250 TB running now. In order to be affordable, the
chosen technology must provide the required performance and at the
same time be cost-effective and easy to operate and use.
We will present an analysis of the cost (both in terms of material
and personnel) of the current implementation (network-attached
storage), and then describe detailed performance studies with hardware
currently in use at CERN in different configurations of filesystems
on software or hardware RAID arrays over disks. Alternative
technologies that have been evaluated by CERN in varying depth (such
as arrays of SATA disks with a Fiber Channel uplink, distributed disk
storage across worker nodes, iSCSI solutions, SANFS, ...) will be
discussed. We will conclude with an outlook of the next steps to be
taken at CERN towards defining the future disk storage model.
