Wednesday, March 9, 2011

Boot Process In AIX


AIX Boot Process


AIX Booting Process explained below.

Phases of the Boot Process:

I. Read Only Storage Kernel Init Phase

1. Motherboard is Checked - Power On Self Test

2. Bootlist is found - System Read Only Storage detects the first boot device in the bootlist spacified.

3. Boot image is read into memory - First 512 bytes - the bootstrap code - of the Hdisk is loaded into the RAM.

4. Initialization starts - Bootstrap code locates the BLV (hd5) from hdisk.

- BLV contains AIX Kernel, rc.boot scripts, reduced ODM, and boot commands.

- BLV get uncompressed in RAM and kernel gets released from it.

- Then AIX kernel gets the control

- AIX Kernel creates a RAMFS

- Kernel Starts the init process from BLV

- init executes rc.boot script from the BLV in the RAM


II. Base Device Configuration Phase

1. All devices are configured with cfgmgr command - init process from RAMFS executes rc.boot 1

- restbase command copies ODM from BLV to RAMFS

- cfgmgr will run and configure all the base devices


III. System Boot Phase

1. Logical volumes are varied on - rc.boot 2 is executed.

- ipl_varyon will varyon the rootvg

- run fsck on / and mount the same to RAMFS

- run fsck on /usr and mount the same to RAMFS

- run fsck on /var and mount the same to RAMFS


2. Paging is started - copycore command checks the occurrunce of the dump and copies the same from primary dump device to /var/ras/adm

- unmount /var and activate the paging space

- mount /var

- Now /, /usr and /var are mounted in rootvg in hdisk


3. /etc/inittab is processed - Kernal remove RAMFS

- init process is started from / in rootvg

- in rc.boot3, init processes /etc/inittab and remaining devices are configured.

- /etc/init starts /etc/inittab and runs /sbin/rc.boot 3

- run fsck on /tmp and mount the same.

- syncvg for rootvg and reports the stale PPs


4. Relevant Services according to run level starts. srcmstr daemon controls this - starts the deamons like errdaemon, syncd etc..


4 comments:

shijusmart said...

Really nice editorial ...Keep it up!!!

Unknown said...

ipl_varyon will varyon the rootvg it's done on phase 2

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