Storage Summary

This section briefly summarizes the chief storage system constraints and tells how to perform the most important file-storage tasks at LC.

Storage System Constraints

HPSS has the storage system constraints noted below.

Constraint Type

Constraint Parameters

Largest allowed file size 100 TB (using FTP, NFT, HSI, or Hopper interface)
68 GB/member; 100 TB archive (using HTAR interface)
Longest file name 1023 characters (with HTAR, longest entry name or soft link is 100 characters)
Problem characters in file names
   Treated as file filters
   Forbidden first characters
   Forbidden in any position

? * {a,b}
- ! ~
* ? [ {

Common File Storage Commands

The following commands are used for common file storage tasks. These commands are also available graphically by using Hopper. To efficiently transfer a very large number of (related) files as a manageable archive or library, use HTAR.





Connect to storage ftp storage nft hsi
Make storage directory mkdir dir mkdir dir mkdir dir
Change storage directories cd dir cd dir cd dir
Store a file put file put file put file
Retrieve a stored file get file get file get file
Retrieve from within a stored archive See HTAR See HTAR See HTAR
Delete a stored file delete file delete file delete file
List stored files dir dir ls
Change file permissions chmod chmod chmod
Change "class of service" (COS) site setcos setcos chcos
Start migration of stored file from tape site stage file
Control file overwriting
   Prevent overwriting
   Allow overwriting




Storage Home Directories

Regardless of their access software (FTP, NFT, etc.), LC users arrive at HPSS in their storage home directory. This always has a path name of the form


where username is your LC login name (for example: /users/u34/jsmith). This basic directory structure supports customized division into subdirectories (e.g., by using the mkdir command) as well as access control of stored files.