Data Backup and Cluster “Time Machine”
All globally accessible data on the cluster is backed up to a remote server located across campus. The schedule for backups is roughly daily as transfer limitations allow. In addition, the backup data is snapshotted daily to allow users to go back to previous file versions and to undelete files as needed. The amount of historical data that is retained is determined by the available space on the backup server.
To access the backups, users should change to the backup filesystem (/data/backup/) and choose the snapshot date that they wish to access. Once the files are located, the user should copy the files to their active storage area on the cluster. All backup data is read-only. Here is an example of retrieving a deleted file from the home area:
[jdoe@newton ~]$ cd /data/backup
[jdoe@newton backup]$ ls
Mon_Mar_10_22:05:17_EDT_2008 Wed_Mar_12_17:37:01_EDT_2008
Mon_Mar_10_22:21:02_EDT_2008
[jdoe@newton backup]$ cd Mon_Mar_10_22:21:02_EDT_2008
[jdoe@newton Mon_Mar_10_22:21:02_EDT_2008]$ ls
home data4 data6 EVO polymer tbp VISTAS
data3 data5 data7 Freeprop sphere US_Air05
[jdoe@newton Mon_Mar_10_22:21:02_EDT_2008]$ cd home/jdoe
[jdoe@newton Mon_Mar_10_22:21:02_EDT_2008]$ ls
lsb.acct test.sh.e0
lsb.hosts test.sh.e1147
lsb.params test.sh.o
lsb.queues test.sh.o0
lsb.resources test.sh.o1147
lsb.users tmp
man.strace torque-2.1.9
man.strace.1 torque-2.1.9.tar.gz
man.strace.root users.pl
man.strace.root.1 users.txt
[jdoe@newton Mon_Mar_10_22:21:02_EDT_2008]$ cp lsb.queues ~/
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