AIX FAQ

Q 3. What is NFS and which daemon it is using, what is configuration files?

Ans. NFS is network file system which use for sharing file on the linux/unix plateform.
         Server side daemons are- portmap, nfsd, rpc.mountd, rpc.statd, rpc.lockd
         Client side daemons are- portmap, biod, rpc.statd, rpc.lockd

Q 4. What is portmap?

Ans.  It provide port no for client request

Q 5. How to increase filesystem size?

Ans. Chfs –s +size= m,g /filesystem

Q 6. What is difference between RAID 0 and RAID 1?

Ans Raid 0 is used for striping purpose and Raid 1 is using for mirroring.

Q 7. What is swapon and swapoff commend?

Ans  Swapon turn on paging space and swapoff used to turnoff paging page

Q 8. What is mksysb?

Ans It’s a command which used to take backup of rootvg

Q 9. What is difference between jfs and jfs2?

Ans  There are following difference-------
              jfs jfs2
1-Inode size                           128 Byte 512Byte
2-Max file size                        64GB                                                    4PB
3-Max filesystem size             1TB                                                        4PB
4-Cmpresion                           yes                                                          no
5-jfslog-type                          General jfslog             inline-jfslog
Minimum file system size not specify 16MB
Inode allocation                          static             dynamic

Q 10. How to start mountd daemon?

Ans  startsrc –s mountd

Q what is path?

Q1. Which is the ODM command to list the ODM object that stores the physical volume identifier?

Ans.  odmget  -q  name=hdisk0 CuAt


Q2. What are the basic components of ODM and in which format data is stored in ODM.

Ans. Components are uniquetype, attribute, deflt and values
         Data is stored in binary format


Q3.  Which is the environment variable used by all the ODM commands
And that is set in file /etc/environment. What is its default value.

Ans. ODMDIR and default value is /etc/objrepos

Q4. Which three types of information are not managed by ODM?

Ans.  Filesystem information, User/Security information, Queues and Queue devices.

Q5.  Which repositories stores the ODM object classes?  

Ans. /etc/objrepos, /usr/lib/objrepos and /usr/share/lib/objrepos

Q6. Which is the ODM object class used by cfgmgr to determine the correct sequence when configuring devices.

Ans.  Config_Rules

Q7. What are the contents of Boot Logical Volume? Briefly explain them?

Ans. AIX Kernel, rc.boot, Reduced ODM and Boot commands.

AIX kernel – It is always loaded from the boot logical volume. It provides basic services like process, memory and device management.

Rc.boot – after starting the kernel, the boot script rc.boot gets control over the boot process.

Reduced copy of ODM – During the boot process many devices are configured before hd4 is available. For these devices the corresponding ODM files must be stored in the boot logical volume.

Boot commands – The boot commands are programs that are called during the boot process eg. Bootinfo, cfgmgr.

Q8. How to fix a corrupted BLV by using a CD or tape?

Ans. 1. Boot the machine in maintenance mode from a CD or tape.
2. Access rootvg.
3. Run command bosboot –ad /dev/hdiskn
4. Use command Shutdown –Fr so that all changes are written from memory to disk.

Q9. List the sequence in which the default boot list in RS/6000 is stored?

Ans. 1. Diskette Drive
2. CD-ROM
3. Internal disk
4. Communication adapter (like Ethernet or token-ring)

Q10. The diag command is part of which package?r

Ans. bos.rte.diag