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(7) Scratch Volumes

Scratch Volumes

AFS can be used for storage of data and temporary work files which do not need to be backed up. To allow for this while keeping quotas on the home volumes below a reasonable limit, we can create scratch volumes on request. The tape backup system knows to skip over these, but otherwise they are treated exactly as for any other volume.

Backup snapshots created each night -- can be used to recover from accidental deletions
Stored on RAID disk on the servers, so protected against most hardware failures.
Backup snapshots do not get sent to tape backup, but are overwritten each night.

Scratch volumes are usually mounted at /afs/@cell/nobackups/username but can be mounted by the owner at any location which is convenient. They are not subject to any automatic purging of old files, as is typically performed on local /tmp or /scratch directories.

scratchvolumes.src last modified May 26, 2005

Introduction

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