Storage

Backed-up storage

There are a number of places you can store files off your workstation

~/thom-fs-common, ~/thom-fs-nethome and ~/theory-fs-common are mounted to your workstation.

cerebro:/filestore contains 37Tb backed-up storage.

Avoid copying large amounts of 'useless' data (e.g. scratch files which cannot be read by anything). It is also sensible to have a README file to index what is where.

IFS Storage

Managed workstations in the group have been updated to connect to the new IFS storage. It will appear as ~/ifs-thom. If this is not shown, please log out and log in again.

For unmanaged machines, one of the following should work:

• Linux CLI (wherever), substituting the appropriate values:

sudo mount -t cifs -o 'domain=AD,username=cen1001,uid=1000,gid=1000,file_mode=0750,dir_mode=0750' //rfs.ch.private.cam.ac.uk/thom

• Mac Finder and some Linux file managers will accept:

smb://rfs.ch.private.cam.ac.uk/thom

• Windows Explorer:

\\rfs.ch.private.cam.ac.uk\thom

If ~/ifs-thom is not showing up, it could be that you've not logged in with your password (e.g. just remotely logging in with ssh key authentication). In that case you can force a log in with

ssh -oPubkeyauthentication=no localhost

You can immediately log out again and the ifs connections will persist.

Bandwidth Limit for Easter Term 2019

Chemistry Department had to delay the upgrade of their link to CUDN to 10Gbps because the new UIS switches turned out not to support the Department's current resilient connection arrangement. This however has been arranged for after Easter Term 2019. Consequently, the Department's uplink still runs at the same speed as every desktop's individual connection, and so it's very easy for even one person uploading lots of data to the IFS to saturate Chemistry's outward link. If there is a need for bulk upload data before the upgrade of the link, please use rsync with the --bwlimit option or some other program that can limit its bandwidth. 300Mbps should be safe.

An example command for rsync is

rsync -a --bwlimit=300000 dir1 ~/ifs-thom/crsid/calc

which syncs in archive mode (-a) with a bandwidth limit of 300000 kilobit per second (equal to 300 Mbps), and which places dir1 in ~/ifs-thom/crsid/calc (provided that crsid/calc has been created).

Once the Department gets the outbound link up to 10Gbps this will not be an issue.