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Solaris Interview Questions with Answers

> Explain the boot process?
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.

> What is the difference between init 1 and init s ?
If you switch from multiuser mode to init s and switch it back to multiuser mode.then remote useres automatically reconnects to the system. where as in the case of init 1. they have to reconnect manully means they have to relogin

> Explain about init phases ?
There are 8 run level.
Init0: Shutting down the system and bring back the system to OBP prompt (OK)
Init1: Single user mode for administrative
Init2: Multi user mode without resource sharing
Init3: Multi user mode with resource sharing
Init4: Not in use
Init5: Shutdown and power off the system
Init6: Reboot the system to default run level
Inits: Single user mode but user login are disabled

> Explain rc script and run level ?
Rc script : check and mount the file system, start and stop the various process.
Run level: Base on the init phases 8 run level

> Which file will take place while booting ?
# /etc/inittab

> How many file to modify the host name to be changed without rebooting the system ?
There are 6 files.
#vi /etc/hosts
#vi /etc/nodename
#vi /etc/hostname.hme
#vi /etc/net/ticlts/hosts
#vi /etc/net/ticosts/hosts
#vi /etc/net/ticotsord/hosts

> Where the ip address will be stored ?
# /etc/hosts
# /etc/hosts.equi
# /etc/hosts.hme

> How to configure the network card ?
# ifconfig hme0 plumb
# ifconfig hme0 192.9.200.10 netmask 255.255.255.0 up
# vi /etc/hosts ( update the ip address )
# vi /etc/hosts.hme0 ( update the ip address ) --> to bring the interface along with the ipaddress during boot time.

> How to configure the virtual ip address ?
Infinity virtual ip address can be created.
# ifconfig hme0:1 plumb
# ifconfig hme0:1 192.9.200.10 netmask 255.255.255.0 up
# vi /etc/hosts ( update the ip address )
# vi /etc/hosts.hme0:1 ( update the ip address ) --> to bring the interface along with the ipaddress during boot time.

> How to find the network card speed ?
# ndd –get /dev/hme link_speed
1 = 100mbps
0 = 10mbps

> How to modify network card speed ?
# ndd –set /dev/hme instance 0
# ndd –get /dev/hme link_status
# ndd –get /dev/hme link_mode
To modify
# ndd –set /dev/eri instance 0
# ndd –set /dev/eri adv_100T4_cap0
# ndd –set /dev/eri adv_100fdx_cap1
# ndd –set /dev/eri adv_100hdx_cap0
# ndd –set /dev/eri adv_10fdx_cap0
# ndd –set /dev/eri adv_10hdx_cap0
# ndd –set /dev/eri adv_autoneg_cap0

> How to find the hardware configuration ?
OK banner --> from the open boot prompt
# prtconf
# sysdef
# /usr/platform/sun4u/sbin/prtdiag

> How will you find the number of hard disk ?
# format
#dmesg --> this will not give the correct answer
#sysdef
#iostat –En --> it wont show the Fibre channel
OK show-devs --> it will show the device scsi bus channel
OK probe-scsi-all --> This will deteck all the scsi bus channel, it will show CD-ROM/DVD-ROM also

> Difference between probe-scsi-all and probe-scsi ?
OK probe-scsi-all: it will show all the scsi devices connected internal and external
OK probe-scsi: it will show only internal scsi devices connected

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