PRIMECLUSTER Global File Services Configuration and Administration Guide 4.2 (Solaris(TM) Operating Environment)

7.6.2 external quotas file and internal quotas file

1. File structure

A 64-byte area per user is used for quota data. For the structure of each file, quota data is stored at an offset obtained by multiplying the UID value by 64 bytes.

The UIDs of users must be consecutive values (if possible). If the values are not consecutive, unused areas that do not contain quota data result, causing inefficient use of space. In addition, the quota data may not be hit in the cache if access to the data is tried. Therefore, with real input-output, system performance can be reduced.

2. Storage area

The area of the internal quotas file is allocated from the V-data area. The area of the external quotas file is allocated from the data area.

The area from the V-data area is allocated in units of one kilobyte. The area from the data area is allocated in units of eight kilobytes.

For example, assuming consecutive UID values in a range of 1,000 to 2,999, the internal quotas file requires 125 kilobytes and the external quotas file requires 128 kilobytes.

If the quota function is used in an existing GFS Local File System, check for sufficient free area in the V-data area.