- Tape backups provide long term backup and archival and protect against multiple disk failure.
- RAID-5 protects against single disk failure without downtime and the loss of data since the most recent tape backup.
If you have any questions, please stop by our workroom in Kunsela C122 or email the admins.
Tape Backups:
The CS department uses an Exabyte VXA-3 tape drive with a 10 tape changer for backups. 8 of the 10 tapes are devoted to home directory backups. These 8 tapes are in a 2 month rotation with 1 week's worth of backups saved to a tape.
Home directory tape backups are performed nightly. Full dumps (a copy of all files) are run every Sunday morning. Incremental dumps (copy only those files that have changed since the last backup) are done every other night of the week.
Should you need files restored from backup tape, email the admins.
RAID Level 5:
The 3 primary CS file storage areas are on RAID-5 arrays to help prevent data loss due to disk failure.
Home directories are stored on 4 Seagate Cheetah 15K.4 73gb Ultra320 SCSI, 15,000 RPM disks attached to a Adaptec 2200S SCSI RAID card.
The /opt/pub/ filesystem is stored on 4 250gb Western Digital SATA disks attached to a Adaptec 2410SA RAID card and enclosure kit.
With RAID-5, a filesystem is stored across multiple disks along with parity information. If any one of these disks fails, the others will be able to function based on what data and parity information is still available. A more detailed description is available here.