Hardware resources

Compute servers

• There are 8 x 28-core compute nodes with 128 GB RAM each (wonko1 - wonko8)
• There is a 96-core SMP server with 3 TB of RAM (alf)

Storage

• Please also see Storage Quotas and Charges
• Home directories are on a 70 TB NFS4 filesystem over Infiniband (/home)
• User data directories are on a 1.2 PB Lustre filesystem over Infiniband (/nlustre/users)
• User scratch directories are on a 1.2 PB Lustre filesystem over Infiniband (/nlustre/scratch/users)

Backups

• Home directories (/home) are backup up daily with a 14-day retention period for file versions.
  • You can thus possibly ask the system administrator to restore a copy that existed in the previous 14 days.
• Lustre data directories (/lsutre/users) are replicated every evening. Multiple versions of files are not retained.
  • Deleted files are purged on Sundays. This means that if you accidentally delete a file, the system administrator may possibly be able to restore the file if you alert him before the first Sunday comes along.
  • If you overwrite a file, it will be replicated around 20:00 that day. If you alert the system administrator before then, he may possibly be able to restore the copy from the previous day.
• Please contact the system administrator (johann.swart at up.ac.za) if restores are needed.