Alabama Supercomputer Authority Policy

Policy: ASAP05 - R8
Title: HPC Client File Storage Capacities
Date: 08/16/95:Revised 09/1/2009
Distribution: All ASA Users

A. OVERVIEW.

The policy relates to file storage capacities for clients using ASA High Performance Computing (HPC) facilities.

The client is responsible for providing his/her own backup by what ever method is appropriate (e.g. ftp to local node, etc.).

File backup is performed at the central site only for unscheduled outages and disaster recovery.

B. CLIENT PERMANENT FILE STORAGE.

Each client account is assigned a /home directory in a file system for a particular HPC platform. Client files stored within this directory are termed permanent client storage. Files stored here remain until removed by the client or by the PERMANENT STORAGE PURGE (see C, below).

File storage limits in the/home directory are set at 1 GB (1 gigabyte) for the particular HPC platform and a total of 2 GB (2 Gigabytes) across all systems excluding scratch disk.

If a client requires more file space (up to 40 GB) the client must request additional space from ASA's HPC Computational Specialist at hpc@asc.edu .

Clients requiring file space over and above 20 GB must make a request directly through ASA's Chief Fiscal Officer, there will be a charge involved.

C. PERMANENT STORAGE PURGE.

When the /home limit is reached, clients will get a warning message indicating that disk usage must be reduced below their assigned limit within in 7 days. After 7 days without reducing usage, any process attempting to create additional files will be killed.

D. CLIENT TEMPORARY DISK STORAGE.

To accommodate jobs that require large amounts of temporary scratch space, clients will have access to the /scratch directory. This directory provides 1.1 TB (1.1 Terabytes) of temporary storage. Data left in this directory after calculation completes will be purged after seven (7) days with no backup.

E. CLIENT DISK BACKUP.

To provide recovery in the event of a storage hardware failure, files on HPC file storage facilities will be backed up periodically to a RAID server. These backups are not available for recovery of individual files deleted by a client. No backup is maintained for files on/scratch .

In the event that client /home directory files are destroyed by hardware or software system failure, /home, directory files will be restored from the latest backup available. Files on /scratch cannot be restored. A news notification will be posted.

F.ACCOUNT EXPIRATION.

Accounts are established on an annual basis. Home directory files are maintained up to one year after account expiration.

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