Monday, 25 May 2009

Important upgrades in last week SD: Improving the Computing Service

Last tuesday 19th May we had a Scheduled Downtime where quite a lot of important interventions were performed, aiming to improve the performance and reliability of some of the PIC services.
One of these interventions was the connection of the HP c7000 bladecenters to two stacked 10GE switches. Using a configuration already in place and originally designed for the dCache disk servers. The resulting bandwidth for the Computing LAN will be an average of 1,78 MB/s/core in the switch-router uplink and 3,9 MB/s/core in the bladecenter-switch uplink (after connecting each blacecenter with 4x1GE). One of the good things of this LAN infrastructure is its scalability, so we will keep an eye on the cacti monitoring of these links to anticipate wether we need to scale up.
Another important intervention which took place also affecting the Computing Service was the migration of the NFS shared software area to a new much more robust hardware: a FAS2020 cabin with SAS disks. This will not solve all the inherent problems that an NFS shared area brings to our lives, but at least will let us sleep a bit more relaxed while a more scalable solution for VO software access from the WNs arrives.

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