Cache disk Usage Report

Disk Name* Total Space Avail. Space Total Data** Data in disk Data in Tape Pinned by User Volatile Data Small File***
FormFactor 2,199 GB 2,165 GB 33 GB 100.0% 85.3% 0 GB 0 GB 1.2 GB
LHPC 18,000 GB 3,309 GB 229,000 GB 7.0% 99.2% 1,663.2 GB 0 GB 178.5 GB
NPLQCD 9,346 GB 605 GB 115,075 GB 7.0% 98.3% 0.4 GB 0 GB 44.3 GB
PROJS 2,749 GB 873 GB 17,705 GB 7.7% 99.0% 0 GB 0 GB 0.1 GB
Spectrum 11,708 GB 1,969 GB 24,998 GB 39.0% 100.0% 3,632.3 GB 0 GB 0 GB
chiQCD 644 GB 590 GB 2,284 GB 2.0% 100.0% 0 GB 0 GB 6.9 GB
users 3,848 GB 1,631 GB 16,968 GB 10.3% 91.8% 51.9 GB 1,398.7 GB 468.8 GB

Note:

*LHPC is on hpcdata7. Spectrum is on hpcdata8. NPLQCD, chiQCD, PROJS (contains /cache/disco and /cache/emc) and users are on hpcdata9.

**Total data includes data in cache disk and tape system.

***Small File counts all data files that have size less than 1MB.


Cache Manager Documents


Cache Manager Policy
  • Backup policy:
    - Files will be backed up into tape silo if it reach the criterion [in permanent space1 AND size < 20 GB AND size >
    3 MB AND older than the backup threshold2].

    - Files with size less than 3 MB will be copied to a different disk for backup purpose (backup script runs weekly).

  • Delete policy:
    - When the disk space is needed, the oldest files that satisfied the criterion [pin count = 0 AND size > 3 MB
    AND (in volatile space1 OR (in permanent space AND in tape silo))] will be deleted.
Note:
  1. Files under /cache/users has volatile default space and all other files under /cache has permanent default space.
    User can change any directory space type by put a different .srm-default-policy in the directory.

  2. The backup threshold is 20 days for files under /cache/users directory and 12 days for all other files under /cache.