Two presentations were given at the March technical meeting.
update on activities for the physics database services.
He started by describing the work on Active Data Guard, which is
a very promising technology that the LHC Experiments are looking
forward to using. He then presented two different tests:
Compression tests and ACFS (ASM Clustered File System) tests.
The first one will be highly useful as the LHC Experiments would
preferably like to have most or even all their data
online/read-only. Finally he updated us on activities related to
Oracle Streams. Thanks to the fix for an outstanding bug, the
task of resynchronising with a disconnected site is now greatly
In the second presentation,
Oracle and the storage IOs.
He highlighted first that new tools such as Dtrace change the
way to track IO operations. Then he emphasized that, somewhat
surprisingly, Oracle IO views cannot see correctly an overload
of the CPU. And finally, he explained that there are lots of
differences between the use of flash SSD and ordinary disks. The
biggest difference is seen in IO write operations per second.
This presentation will be given at the CHEP’09 conference next
week in Prague.
Both presentations are available on the openlab Web site.
Mélissa Le Jeune presented the list of papers, presentations
and publications that will go into the Annual Report. She
received several additions from the people present.
thanked the audience and announced that the next Minor Review
Meetings will take place on April, 21st, May, 19th
and June, 16th.
Charlotte-Anaďs Cornaton, Sverre Jarp