UNIVERSITY OF CALIFORNIA OBSERVATORIES / LICK OBSERVATORY
|System Backups with the 115 Gb FireWire Drive||HOME|
System backups for all machines are now being done with a 115 Gb firewire
hard drive (actually two that are rotated weekly). Weekly updates are
performed by cron job which backups half the machines on Saturday morning,
the remaining half on Sunday.
Backups for each machine are numbered; earlier backups are retained. Thus, after a few weeks, you'll see backup.0, backup.1, backup.2, and so on. (In fact, only new files, or files that have changed since the last backup, are actually written to the new backup. Unchanged files are represented as hard links to an earlier backup. This is invisible to the user, however, and each backup will show the complete file system.)
Backups will not be kept indefinitely, however. The disks are expected to fill up in about one year, at which time they will overwritten.
The filesystems that are backed up are:
To look at the backup:
log on to bernard as root and cd to /mnt/firewire1
ls lists all machines backed up (mtham ettin catpc ...)
cd to the machine of your choice
ls lists backups for that machine (backup.0 backup.1 ...)
highest number is most recent
cd to the most recent backup
ls lists the filesystems (lick music u www)
If you should need to swap disks yourself (the one not mounted will be kept at the 3-meter), log on to bernard as root, cd to /, and unmount the current disk by typing:
swap the disks on bernard, and mount the new one by typing:
mount /dev/sda1 /mnt/firewire1
Last update: 5 March, 2003, T.M.