User manual

Set up caches and buffers
iXOS-JUKEMAN 2.2 User Manual Pre.12/97 37
2. If a new disk is inserted into a drive, iXOS-JUKEMAN checks to see if
the root directory is in the cache. If it is not, the parameter autodc
(see section “Server parameters” on page 123) determines what hap-
pens next. If set to 0, no caching is performed. If set to 1, caching is
performed only if a permanent hard disk directory cache is configured.
When set to 2, JUKEMAN will cache the entire directory structure.
When setting the size of the directory cache, keep the following in mind:
1. Each file requires 25 bytes plus the length of the file name.
2. Each directory requires 100 bytes plus the length of the directory
name.
3. Administration of the cache consumes approximately 15% of the
space, so you have to add about one sixth of the totals of items 1 and
2 to the sum.
4. If a disk contains extensions in Rock Ridge format, you must allow for
the additional space occupied by the rock ridge name.