Location;  and custodian. Normally,  a  complete  inventory  is  conducted annually, with spot inventories conducted periodically throughout the year. All of this will be controlled by your local SOP. PERFORMANCE-TUNING INITIATIVES The reports we have covered are good sources for determining  what  performance-tuning  techniques  to implement. Now let’s look at some performance- tuning choices available, both hardware and software. Be sure they are authorized by your command before implementing them. HARDWARE Three possible hardware choices are as follows: l l l Increase computer memory; Reduce file fragmentation; and Add or change a disk drive. Increase Computer Memory To increase a computer system’s memory, we can add memory chips or memory boards. This will allow us to run larger, more complex programs on the system. We can also create cache memory, which is used with the central processor to improve execution speed and enhance   central   processor   performance.   This   is accomplished by reducing the access time required to repeatedly fetch frequently used information stored in main memory. For average program mixes, cache memory yields a 50-percent increase in processing speeds.  The  cache  memory  is  a  random-access  memory (RAM)  buffer  that  provides  high-speed  storage capabilities from main memory and makes this data available to the central processor with a private central processor/cache interface. Reduce File Fragmentation File fragmentation occurs when you delete a file, leaving, basically, a hole in the information on the hard disk, or when you add information to an existing file when there is no contiguous space left next to the file. To correct fragmentation, you can make a backup, reformat the hard disk, and restore your files. You can also   run   a   software   program   referred   to   as   a defragmenter to reorganize the files so the data in each file is contiguous. Add or Change a Disk Drive By adding a new disk drive or replacing a disk drive with a larger drive, you will reduce the problems you may have with disk space. Remember, if you add or change a disk drive, you must modify the system setup so the system will recognize the new drive. SOFTWARE Let’s  look  at  some  operating  system  changes available.  Remember,  anytime  you  are  preparing  to make changes to your operating system, you must consult the system operator manual first. It will show you what can and cannot be changed on your particular system. The operating system changes you can make are  as  follows: . Reconfigure the system; l Change buffer sizes; l  Change  memory  addresses. Reconfigure the System When we reconfigure the system, we can move the device drivers into extended memory. We can move disk files from a smaller capacity disk drive to a larger capacity drive; this will also help with fragmentation. Change Buffer Sizes By   changing   buffer   sizes,   we   increase   the input/output activity of the system, resulting in the job finishing faster. This will also help reduce the chances that the system will lock up. Change Memory Addresses By changing memory addresses, you can tailor extended and expanded memory to the system’s needs. This  results  in  freeing  memory  for  the  execution  of production  jobs. TROUBLE REPORTS AND TECHNICAL ASSISTS You will be responsible for submitting trouble reports   on   software   and   hardware   problems. Remember  to  follow  the  instruction  from  the  command receiving the trouble report. In most cases, this will be the Navy Maintenance and Supply Systems Office (NAVMASSO). As shown in figure 1-8, the trouble report contains a lot of information. Items 13, 14, and 1-24