IBM AIX Operating System - Some useful Commands gathered from IBM and other websites!!!
Kernel
How would I know if I am running a 32-bit kernel or 64-bit kernel?
To display if the kernel is 32-bit enabled or 64-bit enabled, type:
How do I know if I am running a uniprocessor kernel or a multiprocessor kernel?
/unix
is a symbolic link to the booted kernel. To find out what kernel mode
is running, enter ls -l /unix and see what file /unix it links to. The
following are the three possible outputs from the ls -l /unix command
and their corresponding kernels:
/unix -> /usr/lib/boot/unix_up # 32 bit uniprocessor kernel
/unix -> /usr/lib/boot/unix_mp # 32 bit multiprocessor kernel
/unix -> /usr/lib/boot/unix_64 # 64 bit multiprocessor kernel
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Note:
AIX 5L Version 5.3 does not support a uniprocessor kernel.
How can I change from one kernel mode to another?
During
the installation process, one of the kernels, appropriate for the AIX
version and the hardware in operation, is enabled by default. Use the
method from the previous question and assume that the 32-bit kernel is
enabled. Also assume that you want to boot it up in the 64-bit kernel
mode. This can be done by executing the following commands in sequence:
ln -sf /usr/lib/boot/unix_64 /unix
ln -sf /usr/lib/boot/unix_64 /usr/lib/boot/unix
bosboot -ad /dev/hdiskxx
shutdown -r
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The
/dev/hdiskxx directory is where the boot logical volume /dev/hd5 is
located. To find out what xx is in hdiskxx, run the following command:
Note:
In AIX V5.2,
the 32-bit kernel is installed by default. In AIX V5.3, the 64-bit
kernel is installed on 64-bit hardware and the 32-bit kernel is
installed on 32-bit hardware by default.
Hardware
How do I know if my machine is capable of running AIX 5L Version 5.3?
AIX 5L Version 5.3 runs on all currently supported CHRP (Common Hardware Reference
Platform)-based POWER™ hardware.
How do I know if my machine is CHRP-based?
Run the prtconf command. If it's a CHRP machine, the string chrp appears on the Model Architecture line.
How do I know if my System p machine (hardware) is 32-bit or 64-bit?
To display if the hardware is 32-bit or 64-bit, type:
How much real memory does my machine have?
To display real memory in kilobytes (KB), type one of the following:
lsattr -El sys0 -a realmem
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Can my machine run the 64-bit kernel?
64-bit hardware is required to run the 64-bit kernel.
What are the values of attributes for devices in my system?
To list the current values of the attributes for the tape device, rmt0, type:
To list the default values of the attributes for the tape device, rmt0, type:
To list the possible values of the login attribute for the TTY device, tty0, type:
lsattr -l tty0 -a login -R
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To display system level attributes, type:
How many processors does my system have?
To display the number of processors on your system, type:
How many hard disks does my system have and which ones are in use?
To display the number of hard disks on your system, type:
How do I list information about a specific physical volume?
To find details about hdisk1, for example, run the following command:
How do I get a detailed configuration of my system?
Type the following:
The following options provide specific information:
| -p | Displays platform-specific device information. The flag is applicable to AIX V4.2.1 or later. |
| -v | Displays the VPD (Vital Product Database) found in the customized VPD object class. |
For example, to display details about the tape drive, rmt0, type:
You can obtain similar information by running the prtconf command.
How do I find out the chip type, system name, node name, model number, and so forth?
The uname command provides details about your system.
| uname -p | Displays the chip type of the system. For example, PowerPC®. |
| uname -r | Displays the release number of the operating system. |
| uname -s | Displays the system name. For example, AIX. |
| uname -n | Displays the name of the node. |
| uname -a | Displays the system name, nodename, version, machine ID. |
| uname -M | Displays the system model name. For example, IBM, 9114-275. |
| uname -v | Displays the operating system version. |
| uname -m | Displays the machine ID number of the hardware running the system. |
| uname -u | Displays the system ID number. |
AIX
What version, release, and maintenance level of AIX is running on my system?
Type one of the following:
How can I determine which fileset updates are missing from a particular AIX level?
To determine which fileset updates are missing from 5300-04, for example, run the following command:
What SP (Service Pack) is installed on my system?
To
see which SP is currently installed on the system, run the oslevel -s
command. Sample output for an AIX 5L Version 5.3 system, with TL4, and
SP2 installed, would be:
Is a CSP (Concluding Service Pack) installed on my system?
To
see if a CSP is currently installed on the system, run the oslevel -s
command. Sample output for an AIX 5L Version 5.3 system, with TL3, and
CSP installed, would be:
How do I create a file system?
The following command will create, within volume group testvg, a jfs file system of 10MB with mounting point /fs1:
crfs -v jfs -g testvg -a size=10M -m /fs1
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The following command will create, within volume group testvg, a jfs2 file system of
10MB with mounting point /fs2 and having read-only permissions:
crfs -v jfs2 -g testvg -a size=10M -p ro -m /fs2
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How do I change the size of a file system?
To increase the /usr file system size by 1000000 512-byte blocks, type:
chfs -a size=+1000000 /usr
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Note:
In AIX V5.3, the size of a JFS2 file system can be shrunk, as well.
How do I mount a CD?
Type the following:
mount -V cdrfs -o ro /dev/cd0 /cdrom
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How do I mount a file system?
The following command will mount file system /dev/fslv02 on the /test directory:
How do I mount all default
file systems (all standard file systems in the /etc/filesystems file
marked by the mount=true attribute)?
The following command will mount all such file systems:
How do I unmount a file system?
Type the following command to unmount /test file system:
How do I display mounted file systems?
Type the following command to display information about all currently mounted file systems:
How do I remove a file system?
Type the following command to remove the /test file system:
How can I defragment a file system?
The
defragfs command can be used to improve or report the status of
contiguous space within a file system. For example, to defragment the
file system /home, use the following command:
Which fileset contains a particular binary?
To show bos.acct contains /usr/bin/vmstat, type:
Or to show bos.perf.tools contains /usr/bin/svmon, type:
How do I display information about installed filesets on my system?
Type the following:
How do I determine if all filesets of maintenance levels are installed on my system?
Type the following:
How do I determine if a fix is installed on my system?
To determine if IY24043 is installed, type:
How do I install an individual fix by APAR?
To install APAR IY73748 from /dev/cd0, for example, enter the command:
instfix -k IY73748 -d /dev/cd0
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How do I verify if filesets have required prerequisites and are completely installed?
To show which filesets need to be installed or corrected, type:
How do I get a dump of the header of the loader section and the symbol entries in symbolic representation?
Type the following:
How do I determine the amount of paging space allocated and in use?
Type the following:
How do I increase a paging space?
You
can use the chps -s command to dynamically increase the size of a
paging space. For example, if you want to increase the size of hd6 with 3
logical partitions, you issue the following command:
How do I reduce a paging space?
You can use the chps -d command to dynamically reduce the size of a paging space. For example,
if you want to decrease the size of hd6 with four logical partitions,
you issue the following command:
How would I know if my system is capable of using Simultaneous Multi-threading (SMT)?
Your system is capable of SMT if it's a POWER5®-based system running AIX 5L Version 5.3.
How would I know if SMT is enabled for my system?
If you run the smtctl command without any options, it tells you if it's enabled or not.
Is SMT supported for the 32-bit kernel?
Yes, SMT is supported for both 32-bit and 64-bit kernel.
How do I enable or disable SMT?
You can enable or disable SMT by running the smtctl command. The following is the syntax:
smtctl [ -m off | on [ -w boot | now]]
|
The following options are available:
| -m off | Sets SMT mode to disabled. |
| -m on | Sets SMT mode to enabled. |
| -w boot | Makes the SMT mode change effective on
next and subsequent reboots if you run the bosboot command before the next system reboot. |
| -w now | Makes the SMT mode change immediately but will not persist across reboot. |
If
neither the -w boot or the -w now options are specified, then the mode
change is made immediately. It persists across subsequent reboots if you
run the bosboot command before the next system reboot.
How do I get partition-specific information and statistics?
The lparstat
command provides a report of partition information and utilization
statistics. This command also provides a display of Hypervisor
information.
Volume groups and logical volumes
How do I know if my volume group is normal, big, or scalable?
Run the lsvg
command on the volume group and look at the value for MAX PVs. The
value is 32 for normal, 128 for big, and 1024 for scalable volume group.
How can I create a volume group?
Use the following command, where spartition_size sets the number of megabytes (MB) in each physical partition where
the partition_size is expressed in units of MB from 1 through 1024.
(It's 1 through 131072 for AIX V5.3.) The partition_size variable must
be equal to a power of 2 (for example: 1, 2, 4, 8). The default value
for standard and big volume groups is the lowest value to remain within
the limitation of 1016 physical partitions per physical volume. The
default value for scalable volume groups is the lowest value to
accommodate 2040 physical partitions per physical volume.
mkvg -y name_of_volume_group -s partition_size list_of_hard_disks
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How can I change the characteristics of a volume group?
You use the following command to change the characteristics of a volume group:
How do I create a logical volume?
Type the following:
mklv -y name_of_logical_volume name_of_volume_group number_of_partition
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How do I increase the size of a logical volume?
To increase the size of the logical volume represented by the lv05 directory by three logical partitions, for example, type:
How do I display all logical volumes that are part of a volume group (for example, rootvg)?
You can display all logical volumes that are part of rootvg by typing the following command:
How do I list information about logical volumes?
Run the following command to display information about the logical volume lv1:
How do I remove a logical volume?
You can remove the logical volume lv7 by running the following command:
The rmlv command
removes only the logical volume, but does not remove other entities,
such as file systems or paging spaces that were using the logical
volume.
How do I mirror a logical volume?
- mklvcopy LogicalVolumeName Numberofcopies
- syncvg VolumeGroupName
How do I remove a copy of a logical volume?
You can use the rmlvcopy command to remove copies of logical partitions of a logical volume. To
reduce the number of copies of each logical partition belonging to
logical volume testlv, enter:
Each logical partition in the logical volume now has at most two physical partitions.
Queries about volume groups
To show volume groups in the system, type:
To show all the characteristics of rootvg, type:
To show disks used by rootvg, type:
How to add a disk to a volume group?
Type the following:
extendvg VolumeGroupName hdisk0 hdisk1 ... hdiskn
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How do I find out what the maximum supported logical track group (LTG) size of my hard disk?
You
can use the lquerypv command with the -M flag. The output gives the LTG
size in KB. For instance, the LTG size for hdisk0 in the following
example is 256KB.
/usr/sbin/lquerypv -M hdisk0
256
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You can also run the lspv command on the hard disk and look at the value for MAX REQUEST.
What does the syncvg command do?
The syncvg command
is used to synchronize stale physical partitions. It accepts names of
logical volumes, physical volumes, or volume groups as parameters.
For example, to synchronize the physical partitions located on physical volumes hdisk6 and hdisk7, use:
To synchronize all physical partitions from volume group testvg, use:
How do I replace a disk?
- extendvg VolumeGroupName hdisk_new
- migratepv hdisk_bad hdisk_new
- reducevg -d VolumeGroupName hdisk_bad
How can I clone (make a copy of) the rootvg?
You
can run the alt_disk_copy command to copy the current rootvg to an
alternate disk. The following example shows how to clone the rootvg to
hdisk1.
Network
How can I display or set values for network parameters?
The no command sets or displays current or next boot values for network tuning parameters.
How do I get the IP address of my machine?
Type one of the following:
ifconfig -a
host Fully_Qualified_Host_Name
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For example, type host cyclop.austin.ibm.com.
How do I identify the network interfaces on my server?
Either of the following two commands will display the network interfaces:
To get information about one specific network interface, for example, tr0, run the command:
How do I activate a network interface?
To activate the network interface tr0, run the command:
How do I deactivate a network interface?
For example, to deactivate the network interface tr0, run the command:
How do I display routing table, interface, and protocol information?
To display routing table information for an Internet interface, type:
To display interface information for an Internet interface, type:
To display statistics for each protocol, type:
How do I record packets received or transmitted?
To record packets coming in and going out to any host on every interface, enter:
The trace information is placed into the /tmp/nettrace file.
To record packets received on an interface en0 from a remote host airmail over the telnet port, enter:
iptrace -i en0 -p telnet -s airmail /tmp/telnet.trace
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The trace information is placed into the /tmp/telnet.trace file.
Workload partitions
How do I create a workload partition?
To create a workload partition named temp with the IP Address xxx.yyy.zzz.nnn, type:
mkwpar -n temp -N address= xxx.yyy.zzz.nnn
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To create a workload partition with the specification file wpar1.spec, type:
mkwpar -f /tmp/wpar1.spec
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How do I create a new specification file for an existing workload partition
wpar1?
To create a specification file wpar2.spec for an existing workload partition wpar1,
type:
mkwpar -e wpar1 -o /tmp/wpar2.spec -w
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How do I start a workload partition?
To start the workload partition called temp, type:
How do I stop a workload partition?
To stop the workload partition called temp, type:
How do I view the characteristics of workload partitions?
To view the characteristics of all workload partitions, type:
lswpar
Name State Type Hostname Directory
------------------------------------------------------
bar A S bar.austin.ibm.com /wpars/bar
foo D S foo.austin.ibm.com /wpars/foo
trigger A A trigger /
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How do I log in to a workload partition?
To log in to the workload partition named wpar1 as user foo, type:
How do I run a command in a workload partition?
To run the /usr/bin/ps command as user root in a workload partition named howdy,
type:
clogin howdy -l root /usr/bin/ps
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How do I remove a workload partition?
To remove the workload partition called temp, type:
To stop and remove the workload partition called temp preserving data on its file
system, type:
Note:
Workload Partitions (WPARs), a set of completely new software-based system virtualization
features, were introduced in IBM AIX Version 6.1.
Performance monitoring tools
How do I display virtual memory statistics?
To display a summary of the virtual memory statistics since boot, type:
To display five summaries at 2-second intervals, type:
To display a summary of the statistics for all of the workload partitions after boot,
type:
To display all of the virtual memory statistics available for all of the workload
partitions, type:
How do I display statistics for all TTY, CPU, and Disks?
To display a single set of statistics for all TTY, CPU, and Disks since boot, type:
To display a continuous disk report at 2-second intervals for the disk with the logical
name disk1, type:
To display 6 reports at 2-second intervals for the disk with the logical name disk1,
type:
To display 6 reports at 2-second intervals for all disks, type:
To display only file system statistics for all workload partitions, type:
To display system throughput of all workload partitions along with the system, type:
How do I display detailed local and remote system statistics?
Type the following command:
To go directly to the process display, enter:
To go directly to the logical partition display, enter:
To go directly to the disk metric display, enter:
To go directly to the file system display, enter:
How do I report system unit activity?
Type the following command:
To report processor activity for the first two processors, enter:
This produces output similar to the following:
cpu %usr %sys %wio %idle
0 45 45 5 5
1 27 65 3 5
