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Saturday, February 17, 2007

Solaris Interview Questions asked in IBM interviews

11) Which command displays the system configuration information?
A) prtconf

12) Which command is used to configure newly attached hardware ?
A) devfsadm –c where

13) What are the different types of “file systems” in Solaris?
A) There are 3 Types of file system :
13.A.1) Disk based : ufs (standard unix), hsfs (cd-rom), pcfs (Floppy)
Or udf (DVD and CD Rom)
13.A.2) Distributed : NFS (enables sharing of files between many types of n/w)
13.A.3) Pseudo : tmpfs (temporary), swapfs , fdfs, procfs

14) What is a “boot block”?
A) The bootstrap program (bootblk) is found in the next 15 disk sectors. Only the “root” file system has an active boot block, although the space is allocated for boot block at the beginning of each file system.

15) What is “superblock”?
A) The file system is determined by its superblock. It is contained in the 16 disk sectors following the boot block. It contains :
· No. of data blocks
· No.of cylinder groups
· Size of data block fragment
· Description of hardware
· Name of mount point
· File system state flag ( clean , stable , active , logging or unknown)

16) How will you repair the main superblock if it gets corrupted?
A) Every file system has backup superblock at block no.32, which can be given to fsck to repair the main superblock.
# fsck –o b=32 /dev/rdsk/c0t0d0s0

17) How to create new file systems ?
A) newfs /dev/rdsk/c0t0d0s0

18) How will you restore /etc/vfstab file if it gets corrupted?
A) Step 1 : Insert Solaris CD 1 of 2
Step 2 : Go to single user mode : ok boot cdrom –s
Step 3 : Run “fsck” on /(root) partition : # fsck /dev/rdsk/c0t0d0s0
Step 4 : Mount /(root) file system on /a directory to gain access to file system
# mount /dev/dsk/c0t0d0s0 /a
Step 5 : Set & export TERM variable
# TERM=sun
# export TERM
Step 6 : Edit /etc/vfstab file and remove the incorrect entry : # vi /a/etc/vfstab
Step 7 : Unmount the file system : # cd / ; # umount /a and reboot the system.

19) How will you share user’s home directory?
A) Step 1 : Login as root and verify mountd daemon is running
# ps –ef | grep mountd
Step 2 : If the daemon is not running start it :
# /etc/init.d/nfs.server start
Step 3 : List all shared filesystems
# share
Step 4 : Edit the /etc/dfs/dfstab file and add :
# share –F nfs /export/home
Step 5 : Share the file systems in the /etc/dfs/dfstab file :
# shareall –F nfs
Step 6 : Verify that the home directory is shared.
# share

20) What does /etc/inittab file contain ?
A) The /etc/inittab contains the systems default run level, processes to start/monitor
or restart. It also contains the actions to be taken when run level changes.
/etc/inittab file is in foll format :- id:rstate:action:process

Thanks Dushyant (scorpio) for sharing these interview questions

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