You can improve efficiency and reliability by creating OpenTP1 file systems with a disk assigned to each type of file.
If you create each type of file on a different disk, the cost (for the disks) increases, but efficiency and reliability also increase. If you create the entire file system on one disk, the cost decreases, but reliability also decreases because if the disk become unusable, all the files become unusable.
To create the most appropriate file system, the OpenTP1 administrator needs to decide on the basis of a variety of factors including cost, operability, efficiency, and reliability.
The following are typical factors to consider when deciding how to organize files:
- Hardware configuration
When creating an OpenTP1 file on a character special file and when the disk configuration is determined, the OpenTP1 administrator must know the number and sizes of the partitions that can be allocated for an OpenTP1 file system.
- System configuration
The OpenTP1 administrator must:
- Determine what types of files are necessary by considering the functions of the system to be configured. For example, the message queue file is unnecessary if messages need not be exchanged with the host computer.
- Determine the sizes of files such as the system journal file and checkpoint dump file by considering such factors as how many transactions are processed in one day. Also, determine the size of the message queue file by considering the number of exchanged messages and the length of each message.
- Reliability
More than one subsystem of the OpenTP1 file system should be created according to the importance of the files. For example, you can create one subsystem for use by the OpenTP1 system and another for use by users. The file subsystem for use by OpenTP1 could include the system journal file, checkpoint dump file, and status file. The file subsystem for use by users could include the message queue file and user files.
- Performance
If frequently accessed files are all on the same disk, data I/O performance will deteriorate. To prevent this, place frequently accessed files on different disks.
The OpenTP1 administrator needs to consider the above factors, and decide the most appropriate file system on the basis of performance, reliability, cost, and operability considered as a whole.
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