Faculty of Environment

SAN Storage

It's possible for groups within the Faculty (such as Schools, or Research Groups) to buy additional storage on the University SAN system to provide larger volumes than are possible on the M Drive. This is an enterprise level system with high reliablity and fault tolerance. These areas are accessible in the N Drive on Windows desktops. They are shared areas which are generally accessible for administration purposes to School and Faculty IT staff and management.

 The table below identifies different types of storage available from the University.  Costs and features of the different storage types are described.

The costs shown are lifetime costs for upfront purchase of space sufficient for up to 1 TB data.

The option of a lease funding profile is under review with Faculty Finance Managers.

Type Scratch with RAID protection Single copy with RAID, Full Tape Backup and VSS Replicated with RAID, VSS and Monthly Tape Backup
Features No recovery of data is possible with this storage type User recovery of recently (2-4 wk) deleted data is possible. Will loose no more than up to 1 days data if recovery from tape is required. Data available in the event of single data center or server loss, and user deleted data can be recovered by user. May loose up to 28 days data where restore from tape is required.
Useful For Online backup location for systems and services or storage of large volumes of reproducible data. Useful for general use purposes, where data should be well protected. Equivalent to previous mSTOR option. Data which needs to be highly available.
Cost per Tb 790 pounds 1850 pounds 2610 pounds
Physical Disk Corruption RAID protection RAID protection RAID protection
User File Deletion Recovery not possible User can recover file directly using VSS within 28 days of file deletion. Not required if within 28 days as recovery by user through VSS is possible
Single server or data center loss Recovery not possible Data recovered from tape, with the loss of no more than 1 days worth of data. Protected as data is mirrored to alternate machine room.
Multiple server or data center loss Recovery not possible Data recovered from tape, with the loss of no more than 13 days worth of data. Data recovered from tape, with the loss of no more than 29 days worth of data.
File system corruption Recovery not possible Data recovered from tape, with the loss of no more than 1 days worth of data. Data recovered from tape, with the loss of no more than 28 days worth of data.

 

RAID: A mechanism for physical protection of data on disk through simultaneous use of 2 or more disks to store data.

Full Tape Backup: Uses a weekly full and daily incremental backups to tape to allow data recovery if required. Monthly full dumps are taken and stored offsite

Monthly Tape Backup: Uses a full dump once a month to tape stored offsite. Up to 28 days of data may be lost where restore from tape is required.

VSS: Volume Shadow Copy - a Windows technology which takes daily snapshots. Allows the user to recover old versions or deleted items for up to 28 days.