Customization of devices by changing attributes from their default settings results in a larger ODM device-configuration database and could lead to fewer devices that can be supported.
More devices require more real memory.
Two file systems are used by AIX in the support of devices. The first is a RAM file system used during boot in an environment with no paging space and no disk file system mounted. The RAM file system provides a maximum of 32 MB and 8960 i-nodes. If either of these resources is exceeded by the requirements of the attached devices, the system may not boot. The only recovery is to remove some of the devices.
The second file system is the root file system on disk. The space and i-nodes in this file system can be increased as long as there are unallocated partitions in the rootvg.
With AIX Version 5.1 and the minimum allowed system memory of 64 MB, it is likely that 5000 AIX devices (both physical and logical) can be configured. Depending on the various factors mentioned above, it may be possible to handle more or (in some cases) fewer devices.
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AIX 5L for POWER Version 5.1 Release Notes
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AIX 5L for POWER Version 5.1 Installation Documentation
AIX 5L for POWER Version 5.1 Release Notes contains information that will aid you in the installation of AIX 5L Version 5.1.
The AIX 5L Version 5.1 documentation library is available at the following Web site:
http://www.ibm.com/servers/aix/library
AIX documentation is also contained on the AIX documentation CD. The documentation is made accessible by loading the documentation CD onto the hard disk or by mounting the CD in the CD-ROM drive.
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