To determine if disk usage corresponds to the way it is initialized and mounted, examine the Detailed Volume Analysis section. Note the actual values of items affected by initializing and mounting, and compare them to the values they were assigned when the disk was initialized and mounted.
Disk Analysis _NUN$DUA32: (COOLER) Page 1 Detailed Volume Analysis Performance Agent VX.X Monday 11-MAY-2008 14:50 Items preceded by 'I','M' or 'S' are controlled by Initialize, Mount or Sysgen. (I ) Volume name is 'COOLER '. (I ) Serial number is 0. (I ) Creation date was 8-JAN-1998 14:54:05.19. (I ) Volume owner is 'SYSTEM '. (IM ) Owner uic is [00001,000004]. (I ) Format type is 'DECFILE11B '. (IM ) Volume protection is [RWED,RWED,RWED,RWED]. (IMS) Default data checking is NOREAD-CHECK, NOWRITE-CHECK. (I ) Structure level is 2, version 1. (I ) Allocation cluster size is 3 blocks. (I ) Index file bitmap is located at LBN 445614. (IM ) Default file extension is 5 blocks. (IM ) Default window size is 7 retrieval pointers. (I ) Maximum number of files allowed is 111384. (IMS) Default number of cached directories is 3. Volume size is 891072 blocks with 51 blocks/track, 14 tracks/cylinder, 1248 cylinders/volume.
In the Detailed Volume Analysis section, items preceded by an I are controlled by disk initialization. Items preceded by an M are controlled by disk mounting, and items preceded by an S are controlled by system parameters. In the preceding example, the item Default file extension is preceded by both I and M. Therefore, disk initialization and mounting control this item.
Compare the value of the default file extension to the value of mean allocated blocks per extent in the Allocated Space section. If the value of the default file extension is significantly larger than the mean allocated blocks, then files are allocated more blocks than they actually need. Reinitializing the disk and reducing the default file extension size may improve disk utilization.
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