Sun Solaris (OS) Interview Questions & Answers

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- find . -depth -print

- cd CDMA_3X_GEN*Here original directory name is . .CDMA_3X_GENERATION_DATA..

- du -k * | sort .nr (or) du .k . | sort -nr

- tail .f Debug.logHere tail shows the newly appended data into Debug.log by some processes/user.

- grep .Debug. *.confHere grep uses the string .Debug. to search in all files with extension..conf. under current directory.

- cat sample.txt | grep -v ‘^$’ > new_sample.txt

- ls -a1 | grep "^."

- ls -l | grep ^- | sort -nr

When NValias need is:

In case system can not boot from primary disk and it is needed to make another boot disk to access the data , nvalias command is used.

nvalias command makes the device alias and assigns an alternate name to a physical disk. Physical address of target disk is required which can be had by show-disk command on ok>.

ok> nvalias disk7 /iommu@f,e0000000/sbus@f,e0001000/dma@3,81000/esp@3,80000/sd2,0

The new aliased disk can be named as boot disk or can be used for booting by referring its name

ok> setenv boot-device disk7

ok>reset

or

ok> boot disk7

The user is exisitng in the /etc/passwd file and the shell is also properly configured and there is no specific error messages in the /var/adm/messages file.

On a 32-bit system, the two-part kernel is located in the directory /platform/?uname -m?/kernel.

On a 64-bit system, the two-part kernel is located in the directory/platform/?uname -m?/kernel/sparcv9
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isainfo -b
the above command displays whether the processor is 32/64 bit

1. Install the sendmail recent package..

2. in /etc/mail/sendmail.cf file configure for localhost,mail server and domain name.

3. Restart the sendmail service...

that's it .. getback to me if having any more doubt.

#prtdiag command will help you to find the RAM size.

Sun Fire 15K can have upto max of 106 processors

In Solaris whenever you create a new slice using format command a raw physical slice or a Raw Device will be created which is addressed as /dev/rdsk/c#d#s# where # is the number for slice.

After formatting it with newfs command the slice will be addressed as /dev/dsk/c#d#s# which can now be used for mounting.

eg. newfs /dev/rdsk/c0d0s4

mkdir /oracle

mount /dev/dsk/c0d0s4 /oracle

After mounting /dev/dsk/c#d#s# is called as Block Device

/dev actually contains logical device names which are links (Shortcuts in windows terminology) to actual physical devices in /devices directory.

/ represents the top most level of the OE directory hierarchy, therefore other sub directories have to be mounted under /

you can simply use the time command on both systems.! For example:

time <<trans>>

out put will be like..
real 0m2.009s
user 0m0.000s
sys 0m0.000s

So, in actuality, It took a total of 2.009 seconds of my time to watch this command complete. But, as you can see, it used virtually no processing time.

For small transcation you may not find the much difference(sometimes no diff)

I think "if you first installed Solaris then try to install XP, XP will overwrite the Solaris.Becoz XP is single boot, It is better to install XP first then install Solaris.."

Simple funda is First install Workstation then install Servers..

A 'daemon' is a software process that runs in the background (continuously) and provides the service to client upon request. For example named is a daemon. When requested it will provide DNS service. Other examples are:

xinetd (it is a super-daemon, it is responsible for invoking other Internet servers when they are needed)
inetd (same as xinetd, but with limited configuration options)
sendmail/postfix (to send/route email)
Apache/httpd (web server)
'server process' run runs one time, when called by a daemon. Once done it will stop. For example telnetd (in.telnetd) or ftpd called from xinetd/inetd daemon . By calling server process from daemon you can save the load and memory. Use a server process for small services such as ftpd, telnetd

A solaris disk has an area called volume table of contents(VTOC) that stores information about disk structure and organization.
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VTOC stores in 0th sector
After VTOC Boot Block is there from (1-15) sector

using command call ndd

XIR signal used by reset command in solaris.

reset (1M) allows you to reset one or more domains in one of two ways: reset the hardware to a clean state or send an externally initiated reset (XIR) signal. The default is to reset the hardware to a clean state. You will receive an error if the virtual keyswitch is in the secure position. An optional confirmation prompt is given by default. Refer to Chapter 6 in the System Management Services (SMS) 1.2 Administrator Guide for the Sun Fire 15K/12K Systems for more information.

An XIR signal (reset -x ) also traps to low-level domain software (OpenBoot PROM or kadb ), which retains control of the software. The domain must be rebooted manually.

Both these commands are run at obp (open boot Prom) probe-scsi will probe the internal scsi and probe-scsi-all will probe both internal and external scsi.

Maybe not the best explanation but not bad...
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The probe-scsi command communicates with all SCSI devices connected to on-board SCSI controllers.

The probe-scsi-all command additionally accesses devices connected to any host adapters installed in PCI slots.

reboot -r (reconfigure the /dev & /devices)