Storage Quotas

As part of file system upgrade work taking place in late 2016 and early 2017, Quotas are being enabled on HPC Wales home directories. These limit the amount of storage space and number of files that a user or group can store in their respective home directory location.

These limit the amount of storage space and number of files that a user or group can store in their respective home directory location.

To view your allocation, use the ‘myquota’ command, like this:

[ade.fewings@csc001 ~]$ myquota
Disk quotas for group ade.fewings (gid 16778693): 
     Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
cfsfs001-s05:/nfsshare/exports/space05
                   402G    500G    525G            192k   1000k   1050k

In this example, we see six items of data:

  • The first set of three items represent storage space:
    • ‘blocks’ is the amount of storage space utilised, in this case 402GB
    • ‘quota’ is the ‘soft limit’ assigned, in this case 500GB
    • ‘limit’ is the ‘hard limit’ assigned, in this case 525GB
  • The second set of three items represent file count:
    • ‘files’ is the number of files present, in this case 192000
    • ‘quota’ is the ‘soft limit’ assigned, in this case 1000000
    • ‘limit’ is the ‘hard limit’ assigned, in this case 1050000

A ‘soft limit’ can be exceeded for a period of maximum 7 days, after which utilisation must be reduced below the threshold or error will result. In this case, the ‘grace’ item in the ‘myquota’ output will display the number of days remaining in this state.

A ‘hard limit’ can not be exceeded and attempts to do so will result in error.

Increases in quota allocations are possible on a case-by-case basis, please contact the Support Desk to request. However, it is worth noting that quotas are implemented to reduce the unfair use of the system by a few users and thus provide capacity for new users.