b) tar -cvf backup_file.tar /usr /var /lib [ Taking disk image]
a) tar -cv /var /usr /lib | rsh remote_hostname dd of=/dev/rm/0 obs=128
b) ufsdump 0ucf remote_hostname:/dev/rmt/0 /file_system
Extracting / Restore the contents of a tape /tar file
d) ufsrestore rf remote_hostname:/dev/rmt/0 filename [ Restore from remote host tape device ]
List contents of backup
a) tar -tvf /dev/rmt/0 [ List contents of a tar tape ]
b) tar -tvf filename.tar [ List contents of a tar file ]
c) ufsrestore tf /dev/rmt/0n [ list contents of a tape of ufsdump]
Processes and Processor
What are the types of priority classes supported by Solaris ?
Timesharing, system and real-time
How will you place a running process in real time class?
priocntl -s –c RT –I uid process_id_number
How will you start a process in real time class?
priocntl –c RT –e process_name
How will you bind a process to processor ?
pbind –b processor_no process_id
What is the pocket size used by SQL*NET Version 2 on Solaris
Default is 2K
What is the procket size used by network layer TCP/IP in SQL*NET v2?
Inter process communication (IPC) tuning
What is the kernel parameter which controls the UNIX buffer cache on solaris ?
bufhwm ( bufhwm is the maximum amount of physical memory, in kilobytes that can be used byI/O buffers)
While starting an oracle process , the unix system displays an erro message like "Cannot allocate more shared memory segment for the processes" If oracle person approaches you, how will you fix this problem?
ANS: increase the value for kernel memory parameter "set semsys:seminfo_semmns" in /etc/system file. [ this is a blind way]
How do you find out total RAM installed on your machine
Ans: $prtconf |grep size
How do you find no. of processors installed on your sun box and processing speed?
Ans: $psrinfo –v
How do you find out how many disks are available on your system?
Ans: $ format (for sysadmins)
$ iostat –E (for users – count only the disks which has disk size correctly)
System Boot Options
How do you boot sun box in single user mode?
ANS: At ok prompt type "boot -s" [ ok boot -s OR ok boot -1 OR ok boot -S ]
What is the meaning of logical name of a disk drive format like c0t0d0s0?
s0 - Partition or slice number
/dev/rdsk - Raw or character devices
/dev/rmt - Tape devices
/dev/term - Serial line devices
/dev/pts - Pseudo terminals
List commands to display physical devices ?
Note All commands are specific to Sun Solaris operating system