Commands
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:
bootinfo -K
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
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. Let us use
the method from the previous question and assume the 32-bit kernel is
enabled. Let us 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
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:
lslv -m hd5
Note:
In
AIX 5.2, the 32-bit kernel is installed by default. In AIX 5.3, 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 would 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 would 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 would 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:
bootinfo -y
How much real memory does my machine have?
To display real memory in kilobytes (KB), type one of the following:
bootinfo -r
lsattr -El sys0 -a realmem
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:
lsattr -l rmt0 -E
To list the default values of the attributes for the tape device, rmt0, type:
lsattr -l rmt0 -D
To list the possible values of the login attribute for the TTY device, tty0, type:
lsattr -l tty0 -a login -R
To display system level attributes, type:
lsattr -E -l sys0
How many processors does my system have?
To display the number of processors on your system, type:
lscfg | grep proc
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:
lspv
How do I list information about a specific physical volume?
To find details about hdisk1, for example, run the following command:
lspv hdisk1
How do I get a detailed configuration of my system?
Type the following:
lscfg
The following options provide specific information:
-p Displays platform-specific device information. The flag is applicable to AIX 4.2.1 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:
lscfg -vl rmt0
You can obtain very 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:
oslevel -r
lslpp -h bos.rte
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:
oslevel -rl 5300-04
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:
oslevel –s
5300-04-02
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:
oslevel –s
5300-03-CSP
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
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
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
Note:
In AIX 5.3, 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
How do I mount a file system?
The following command will mount file system /dev/fslv02 on the /test directory:
mount /dev/fslv02 /test
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:
mount {-a|all}
How do I unmount a file system?
Type the following command to unmount /test file system:
umount /test
How do I display mounted file systems?
Type the following command to display information about all currently mounted file systems:
mount
How do I remove a file system?
Type the following command to remove the /test file system:
rmfs /test
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:
defragfs /home
Which fileset contains a particular binary?
To show bos.acct contains /usr/bin/vmstat, type:
lslpp -w /usr/bin/vmstat
Or to show bos.perf.tools contains /usr/bin/svmon, type:
which_fileset svmon
How do I display information about installed filesets on my system?
Type the following:
lslpp -l
How do I determine if all filesets of maintenance levels are installed on my system?
Type the following:
instfix -i | grep ML
How do I determine if a fix is installed on my system?
To determine if IY24043 is installed, type:
instfix -ik IY24043
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
How do I verify if filesets have required prerequisites and are completely installed?
To show which filesets need to be installed or corrected, type:
lppchk -v
How do I get a dump of the header of the loader section and the symbol entries in symbolic representation?
Type the following:
dump -Htv
How do I determine the amount of paging space allocated and in use?
Type the following:
lsps -a
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:
chps -s 3 hd6
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:
chps -d 4 hd6
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 to 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 5.3.) 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
How can I change the characteristics of a volume group?
You use the following command to change the characteristics of a volume group:
chvg
How do I create a logical volume?
Type the following:
mklv -y name_of_logical_volume name_of_volume_group number_of_partition
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:
extendlv lv05 3
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:
lsvg -l rootvg
How do I list information about logical volumes?
Run the following command to display information about the logical volume lv1:
lslv lv1
How do I remove a logical volume?
You can remove the logical volume lv7 by running the following command:
rmlv lv7
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?
1. mklvcopy LogicalVolumeName Numberofcopies
2. 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:
rmlvcopy testlv 2
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:
lsvg
To show all the characteristics of rootvg, type:
lsvg rootvg
To show disks used by rootvg, type:
lsvg -p rootvg
How to add a disk to a volume group?
Type the following:
extendvg VolumeGroupName hdisk0 hdisk1 ... hdiskn
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 256 KB.
/usr/sbin/lquerypv -M hdisk0
256
You can also run the lspv command on the hard disk and look at the value for MAX REQUEST.
What does 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:
syncvg -p hdisk4 hdisk5
To synchronize all physical partitions from volume group testvg, use:
syncvg -v testvg
How do I replace a disk?
1. extendvg VolumeGroupName hdisk_new
2. migratepv hdisk_bad hdisk_new
3. 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.
alt_disk_copy -d 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
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:
lsdev -Cc if
ifconfig -a
To get information about one specific network interface, for example, tr0, run the command:
ifconfig tr0
How do I activate a network interface?
To activate the network interface tr0, run the command:
ifconfig tr0 up
How do I deactivate a network interface?
For example, to deactivate the network interface tr0, run the command:
ifconfig tr0 down
