Basic Commands used in Logical Volume Manager (PV,VG,LV,LP,PP,FS)



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 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

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 offSets SMT mode to disabled.
-m onSets 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 nowMakes 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.

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

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 256KB.
/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 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:
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





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