Common Configuration Commands

Creating a Physical Volume

After you scan for LUNs on a host, the LUNs are identified as drive letters like hdisk#. The following uses hdisk2 as an example. Perform the following steps to create a physical volume:

1. Run the chdev command to create a physical volume.

   bash-3.2#chdev -l hdisk2 -a pv=yes

2. Run the lspv command to verify the physical volume creation.

   bash-3.2#lspv 
   hdisk0          00c690001d571eda                    rootvg          active 
   hdisk1          00c6900012ddf6f6                    None    
   hdisk2          00c6900034ddf6f6                    None 
   hdisk3          None                               None  

   If a physical volume is created successfully, a physical volume identifier is added to corresponding disks. In the output, the physical volume identifier is 00c6900034ddf6f6.

Creating a Volume Group

Perform the following steps to create a volume group:

1. Run the smitty mkvg command to create a volume group.

   bash-3.2#smitty mkvg 

   On the screen that is displayed, choose Add a Big Volume Group to go to the screen for configuring volume groups, as shown in Figure 9-1.

   Figure 9-1 Screen for configuring volume groups
   

   Configure the following volume group parameters:

   • VOLUME GROUP name

     Name of a volume group. This parameter is user-configurable.

   • PHYSICAL VOLUME names

     Press Ctrl+4 to select the physical volumes that you want to add to the volume group, for example, hdisk2 and hdisk3.

   • Volume Group MAJOR NUMBER

     Maximum number of a volume group. This parameter is optional, and is used only in importing volume groups on other nodes.

   Keep the default values of the other parameters and press Enter. The volume group is created.

2. Run the lsvg command to check volume group information.

   bash-3.2# lsvg  vg_hacmp 
   VOLUME GROUP:       vg_hacmp                   VG IDENTIFIER:  00072ea20000d40000000135834ed376 
   VG STATE:           active                   PP SIZE:        128 megabyte(s) 
   VG PERMISSION:      read/write               TOTAL PPs:      1598 (204544 megabytes) 
   MAX LVs:            256                      FREE PPs:       17 (138752 megabytes) 
   LVs:                3                        USED PPs:       1581 (1024 megabytes) 
   OPEN LVs:           3                        QUORUM:         2 (Enabled) 
   TOTAL PVs:          2                        VG DESCRIPTORS: 3 
   STALE PVs:          0                        STALE PPs:      0 
   ACTIVE PVs:         2                        AUTO ON:        yes 
   MAX PPs per VG:     32512 
   MAX PPs per PV:     1016                     MAX PVs:        32 
   LTG size (Dynamic): 1024 kilobyte(s)         AUTO SYNC:      no 
   HOT SPARE:          no                       BB POLICY:      relocatable 
   PV RESTRICTION:     none

   In the output, pay special attention to PP SIZE, which will be used in determining the logical volume size during logical volume creation.

Creating a Logical Volume

Perform the following steps to create a logical volume:

1. Run the smit mklv command to create a logical volume.

   bash-3.2# smitty mklv

   On the screen that is displayed, press Esc+4. The names of all volume groups are displayed. Choose the name of a volume group for which you want to create a logical volume and press Enter. The screen for configuring logical volume properties is displayed, as shown in Figure 9-2.

   Figure 9-2 Screen for configuring logical volume properties
   

   Configure the following logical volume parameters:

   • Logical volume NAME

     Name of a logical volume. This parameter is user-configurable.

   • Number of LOGICAL PARTITIONS

     Number of logical partitions. Determine the parameter value based on the previously obtained PP SIZE.

   • PHYSICAL VOLUME names

     Physical volume to which a logical volume belongs.

   • Logical volume TYPE

     File system type (JFS/JFS2).

   Keep the default values of the other parameters and press Enter. The logical volume is created.

2. Run the lslv command to confirm that the information about the newly created logical volume is correct.

Creating a File System

Perform the following steps to create a file system:

1. Run the smit crfs command to create a file system.

   On the screen that is displayed, choose a file system type. Available file system types are as follows:

   • Add an Enhanced Journaled File System

     Corresponds to JFS2.

   • Add a Journaled File System

     Corresponds to JFS.

   • Add a CDROM File System

     Corresponds to an ISO file system in CDROM format.

   The following explains how to create a JFS2 file system.

2. If logical volumes have been created, choose Add an Enhanced Journaled File System on a Previously Defined Logical Volume. The screen for configuring file systems is displayed, as shown in Figure 9-3.
   Figure 9-3 Screen for configuring file systems (logical volumes available)
   

   Configure the following parameters:

   • LOGICAL VOLUME name

     Name of a logical volume

   • MOUNT POINT

     Mount point. This parameter must be different from that of an existing volume.

   • Mount AUTOMATICALLY at system restart?

     Whether to automatically mount the file system upon system startup.

   Keep the default values of other parameters.

3. If no logical volumes are created, choose Add an Enhanced Journaled File System. Choose a volume group to go to the screen for configuring file systems, as shown in Figure 9-4.
   Figure 9-4 Screen for configuring file systems (no logical volumes)
   

   Configure the following parameters:

   • Unit Size

     Size of a unit. The unit size and number of units determine the size of a volume.

   • Number of units

     Number of units.

   • MOUNT POINT

     Mount point.

   • Mount AUTOMATICALLY at system restart?

     Whether to automatically mount the file system upon system startup.

   Keep the default values of other parameters.

4. Run the lslv command to confirm that the information about logical volumes is correct.
5. Run the mount command to mount logical volumes. The command syntax is as follows:

   mount  /dev/logical volume name

Activating a Volume Group

Activate a volume group after importing it. Only an activated volume group can be mounted for data access. Run the following command to activate a volume group:

varyonvg  volume group name

Deactivating a Volume Group

Deactivate a volume group before exporting it. Run the following command to deactivate a volume group:

varyonvg  volume group name

Exporting a Volume Group

In clusters, a volume group needs to be imported or exported during data backup and recovery. Run the following command to export a volume group:

exportvg volume group name

The following is an example:

bash-3.2# lspv

hdisk3       00c6900028b4ccaa                    vgB            

hdisk4       none                                None           

hdisk5       none                                None           

hdisk6       00072e72c5a7d7d4                    vgB            

bash-3.2# exportvg vgB

bash-3.2#lspv

hdisk3       00c6900028b4ccaa                     None

hdisk4       none                                None           

hdisk5       none                                None           

hdisk6       00072e72c5a7d7d4                    None           

Importing a Volume Group

Run the following command to import a volume group:

importvg volume group name physical volume name

The following is an example:

bash-3.2# lspv

hdisk3       00c6900028b4ccaa                    None            

hdisk4       none                                None           

hdisk5       none                                None           

hdisk6       00072e72c5a7d7d4                    None            

bash-3.2# importvg -y vgB hdisk3

bash-3.2# lspv

hdisk3       00c6900028b4ccaa                     vgB

hdisk4       none                                None           

hdisk5       none                                None           

hdisk6       00072e72c5a7d7d4                     vgB

Deleting a Logical Volume

Perform the following steps to delete a logical volume:

1. Run the umount command to unmount the logical volume.
2. Run the rmlv command to delete the logical volume.

Deleting a Volume Group

Perform the following steps to delete a volume group:

1. Ensure that all logical volumes contained in the volume group are deleted.
2. Deactivate the volume group.
3. Run the rmvg command to delete the volume group.

Deleting a Physical Volume

Run the following command to delete a physical volume:

chdev -l hdisk# -a pv=clear

The following is an example:

bash-3.00# lspv

hdisk0          none                                None            

hdisk1          00c69f2242c89068                    rootvg          active

hdisk2          none                                None            

hdisk3          00c69f228c77ae1a                    None            

hdisk4          00c69f228c88fd65                    None          

hdisk5          none                                None            

bash-3.00# chdev -l hdisk3 -a pv=clear

hdisk3 changed

bash-3.00# lspv

hdisk0          none                                None            

hdisk1          00c69f2242c89068                    rootvg          active

hdisk2          none                                None            

hdisk3          none                                None            

hdisk4          00c69f228c88fd65                    None            

hdisk5          none                                None            

bash-3.00#