Current news...

Introducing calculus, a new NFS home directory server for research users

Research users and those with high disk space requirements will welcome the news that a departmental NFS home directory server has now been reinstated to complement the ICT NFS server. Based on the former geometry2 hardware, calculus is initially offering 420 Gb of disk space to users of the Maths compute and Stats Linux clusters, where you will find it mounted on /home/calculus. There is an additional 100 Gb of disk space that could be made available on request.

If you want to use data storage on calculus, please contact Andy Thomas to ask for a home directory be set up for you as these are being created upon request. Like the ICNFS server, calculus is strictly a NFS fileserver and you will not be able to log into it or use it for compute work, etc.

Calculus runs FreeBSD 8.2 with support for the ZFS filesystem and when funds become available, an external 14-disk array will be added to create two ZFS disk pools with a capacity of 1.7 Tb each in the same way as been done for the potomac4a-wicomico SCAN server.

Please note that although calculus uses a hardware RAID 5 disk array for data storage, this itself is currently not being backed up either by the ICT backup service or by our own backup systems. This is because our backup library is currently directly attached to silo in the Huxley basement and is unfortunately subject to the limitations of the very slow network there; backups over the network are currently out of the question although there are plans to bring the Huxley level network up to the same gigabit connectivity enjoyed by the rest of the building. On this has been done, calculus will be regularly backed up to tape.

Older news items:

July 19th, 2011: a new staging server for the compute cluster
July 19th, 2011: A new Matlab queue and improved queue documentation
June 30th, 2011: Updated laptop backup scripts
June 18th, 2011: More storage for the silo...
June 16th, 2011: Yet more storage for the SCAN...
June 10th, 2011: 3 new nodes added to the Maths compute cluster
May 21st, 2011: Announcing SCAN large storage and subversion (SVN) servers
May 26th, 2011: Reporting missing scratch disk on macomp01
May 21st, 2011: Announcing completion of silo upgrades
May 16th, 2011: Announcing upgrades for silo
April 14th, 2011: Goodbye SCAN 3, hello SCAN 4
March 26th, 2011: quickstart guide to using the Torque/Maui cluster job queueing system
March 9th, 2011: automatic laptop backup/sync service, new collaboration systems launched
May 20th, 2010: Scratch disks are now available on all macomp and mablad compute cluster systems
March 11th, 2010: Introduing job queueing on the Fünf Gruppe compute cluster
October 16th, 2008: Introduing the Fünf Gruppe compute cluster
June 18th, 2008: German City compute farm now expanded to 22 machines
February 7th, 2008: new applications on the Linux apps server, unclutter your desktop
November 13th, 2007: aragon and cathedral now general access computers, networked Linux Matlab installation upgraded to R2007a
September 14th, 2007: Problems with sending outgoing mail for UNIX & Linux users
July 23rd, 2007: SCAN available full-time over the summer vacation, closure of Imperial's Usenet news server
May 15th, 2007: Temporary SCAN suspension, closure of the Maths Physics computer room, new research computing facilities
January 14th, 2005: Exchange mail server upgrade, spam filtering with pine and various other enhancements

Andy Thomas

Research Computing Officer,
Department of Mathematics

last updated: 14.08.2011