there are three types if AIX installation methods
1. new and complete overwrite installation
2. migration installation
3. preservation installation.
new and complete overwrite installation
we use new and complete overwrite installation when -:
a. if we have new machine
b. when you want to completely overwrite your's rootvg
c. you want to reassign your hard disks, i.e. you want to make ur's rootvg size
smaller.
migration installation
we use this method to upgrade AIX version 4.2 to 4.3 ,aix 5.2 to 5.3 or 6.1
the installation process determines which optimal software products must be installed.
except /tmp ,this method preserves most filesystems including rootvg, logical volumes and system configuration files.
preservation installation
we use preservation installation when you want to preserve user data in the rootvg.
this method overwrites the /usr ,/var ,/tmp and /root filesystem.
the /etc/preserve.list" file contains the list of system files to be copied and saved during a preservation BOS installation.
the" /etc/filesystems" file is listed by default.
you can add full path names of any additional files that you want to save during preservation installation to the preserve.list file.
trusted computing base(TCB)
the trusted computing base is the part of the system that is responsible for enforcing the information security policies of the system.
by installing the system with the TCB option, we can enable the trusted path,trusted shell,trusted processes and system-integrity checking.
every device is a part of TCB ,every file in /dev directry is monitored by TCB.
TCB automatically monitors over 600 addtional files ,storing ritical information about this files in the "/etc/security/sysck.cfg" file.
it is recommended to backup this file after BOS installation.
you can enable TCB only at the installation time.
TCB can be removed by removing "bos.rte.security" fileset from your system.
#usr/bin/tcbck
if this command shows usage details..then TCB is enabled in your system.
1. new and complete overwrite installation
2. migration installation
3. preservation installation.
new and complete overwrite installation
we use new and complete overwrite installation when -:
a. if we have new machine
b. when you want to completely overwrite your's rootvg
c. you want to reassign your hard disks, i.e. you want to make ur's rootvg size
smaller.
migration installation
we use this method to upgrade AIX version 4.2 to 4.3 ,aix 5.2 to 5.3 or 6.1
the installation process determines which optimal software products must be installed.
except /tmp ,this method preserves most filesystems including rootvg, logical volumes and system configuration files.
preservation installation
we use preservation installation when you want to preserve user data in the rootvg.
this method overwrites the /usr ,/var ,/tmp and /root filesystem.
the /etc/preserve.list" file contains the list of system files to be copied and saved during a preservation BOS installation.
the" /etc/filesystems" file is listed by default.
you can add full path names of any additional files that you want to save during preservation installation to the preserve.list file.
trusted computing base(TCB)
the trusted computing base is the part of the system that is responsible for enforcing the information security policies of the system.
by installing the system with the TCB option, we can enable the trusted path,trusted shell,trusted processes and system-integrity checking.
every device is a part of TCB ,every file in /dev directry is monitored by TCB.
TCB automatically monitors over 600 addtional files ,storing ritical information about this files in the "/etc/security/sysck.cfg" file.
it is recommended to backup this file after BOS installation.
you can enable TCB only at the installation time.
TCB can be removed by removing "bos.rte.security" fileset from your system.
#usr/bin/tcbck
if this command shows usage details..then TCB is enabled in your system.
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