Explain the boot process?
Answer / sbrahman75
Boot process dived into 4 phases.
1. POST
2. OBPROM
3. KERNEL INITIALIZATION
4. INIT PHASES
POST: Power on self test, It will detect hardware, machine
host ID,serial No, architecture type, memory and Ethernet
address and it will load the primary program called bootblk.
OBP: Open boot programmable,
1.Diagnosing all the system hardware and memory.
2.Initializing the boot parameter.
3.Creating device trees and load the boot block
from (0-15 sector), it is called as
secondary boot programmable ufsboot.
KERNEL
INITIALIZATION: ufsboot load the kernel (generic unix),
kernel will load all the necessary
devices modules to mount the root
partition to continue the booting process.
Init Phase : It will started by executing of /etc/init
program and start other process reading the
/etc/inittab files, as the directory in
the /etc/inittab files. .
| Is This Answer Correct ? | 6 Yes | 1 No |
Hello Everyone, One of our servers is showing a strange issue, let me paste the output Code: root # uptime 4:37pm 3 users, load average: 0.00, 0.04, 0.04 Its been running since months but you can see after time there isn't any output like up 191 days(s). Even the who command with b and r option isn't giving any output. Code: root # who -b root # root # who -r root # the date command displays correct output. I am not sure but is it because someone has played with utmpx and wtmpx files, is reboot the only solution we have. Can anyone help us since we don't intend to reboot the server for such a reason and also no one has complained till yet.
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