Renaming Volume Group in HP Unix

Renaming VG in hpux.
Here is the procedure for renaming a VG in hpux. Renaming a VG is simple as exporting the the VG as importing with different name. (eg: vgapp to vgdb)
1. Verify the existing configuration

#vgdisplay vgapp
VG Name                     /dev/vgapp
VG Write Access             read/write
VG Status                   available
Max LV                      255
Cur LV                      2
Open LV                     2
Max PV                      16
Cur PV                      4
Act PV                      4
Max PE per PV               1016
VGDA                        8
PE Size (Mbytes)            32
Total PE                    508
Alloc PE                    336
Free PE                     172
Total PVG                   0
Total Spare PVs             0
Total Spare PVs in use      0
VG Version                  1.0
VG Max Size                 508g
VG Max Extents              16256


1. Umount all the logical volume from vgapp.
# bdf|grep vgapp
/dev/vgapp/test1   10485760   20062 9811599    0% /apps/test1
# umount /apps/test1



2. Deactivate Vg.

# vgchange -a n vgapp
Volume group "vgapp" has been successfully changed.



3. Create  a map file which can be used whileimporting back . File name is /tmp/vgapp

# vgexport -v \ # -->
-p \   # Preview the actions to be taken without updating lvmtab
-s \ #  Scan option for creating map file
-m /tmp/vgapp vgapp  #description of the volume group and its associated logical volume
Beginning the export process on Volume Group "vgapp".
/dev/disk/disk38
/dev/disk/disk39
/dev/disk/disk40
/dev/disk/disk41
vgexport: Preview of vgexport on volume group "vgapp" succeeded.



4. Export VG

# vgexport vgapp
vgexport: Volume group "vgapp" has been successfully removed.



5. Create device files for vgdb

root@rx16-243   [/root]
# ls -l /dev/*/group
crw-r-----   1 root       sys         64 0x000000 Feb 18 20:30 /dev/vg00/group
# mknod /dev/vgdb/group c 64 0x010000
# ls -l /dev/*/group
crw-r-----   1 root       sys         64 0x000000 Feb 18 20:30 /dev/vg00/group
crw-r--r--   1 root       sys         64 0x010000 Feb 20 04:36 /dev/vgdb/group



6. Import the VG with new name using the mapfile
# vgimport -s -N -m /tmp/vgapp vgdb
vgimport: Volume group "/dev/vgdb" has been successfully created.
Warning: A backup of this volume group may not exist on this machine.
Please remember to take a backup using the vgcfgbackup command after activating the volume group.
Note: -N is for pvlink to be in new persistant dsf naming 



7.  Activate the new VG.

# vgchange -a y vgdb
Activated volume group.
Volume group "vgdb" has been successfully changed.



8. Verify the VG and mount the volume

# vgdisplay -v vgdb
--- Volume groups ---
VG Name                     /dev/vgdb
VG Write Access             read/write
VG Status                   available
Max LV                      255
Cur LV                      2
Open LV                     2
Max PV                      16
Cur PV                      4
Act PV                      4
Max PE per PV               1016
VGDA                        8
PE Size (Mbytes)            32
Total PE                    508
Alloc PE                    336
Free PE                     172
Total PVG                   0
Total Spare PVs             0
Total Spare PVs in use      0
VG Version                  1.0
VG Max Size                 508g
VG Max Extents              16256


   --- Logical volumes ---
   LV Name                     /dev/vgdb/test
   LV Status                   available/syncd
   LV Size (Mbytes)            512
   Current LE                  16
   Allocated PE                16
   Used PV                     1


   LV Name                     /dev/vgdb/test1
   LV Status                   available/syncd
   LV Size (Mbytes)            10240
   Current LE                  320
   Allocated PE                320
   Used PV                     3




   --- Physical volumes ---
   PV Name                     /dev/disk/disk38
   PV Status                   available
   Total PE                    127
   Free PE                     0
   Autoswitch                  On
   Proactive Polling           On


   PV Name                     /dev/disk/disk39
   PV Status                   available
   Total PE                    127
   Free PE                     0
   Autoswitch                  On
   Proactive Polling           On


   PV Name                     /dev/disk/disk40
   PV Status                   available
   Total PE                    127
   Free PE                     45
   Autoswitch                  On
   Proactive Polling           On


   PV Name                     /dev/disk/disk41
   PV Status                   available
   Total PE                    127
   Free PE                     127
   Autoswitch                  On
   Proactive Polling           On
# mount /dev/vgdb/test1 /mnt
# bdf /mnt
Filesystem          kbytes    used   avail %used Mounted on
/dev/vgdb/test1    10485760   20062 9811599    0% /mnt




Changing kernel parameters in HP-UX

Changing kernel parameters in HP-UX.


While Installing DB it failed due to  below kernel parameters


Checking for maxssiz=134217728; maxssiz=8388608.         Failed <<<<
Checking for maxssiz_64bit=1073741824; maxssiz_64bit=268435456.         Failed <<<<
Checking for maxuprc=3687; maxuprc=3686.         Failed <<<<
Checking for semmns=8192; semmns=4096.          Failed <<<<


I resolved this issue by setting this parameters using kctune command as below.


For verifying the current Value

# kctune -v for  maxssiz maxssiz_64bit maxuprc semmns
Tunable             maxssiz
Description         Maximum size of the stack segment of a 32-bit process (bytes)
Module              vm
Current Value       8388608 [Default]
Value at Next Boot  8388608 [Default]
Value at Last Boot  8388608
Default Value       8388608
Constraints         maxssiz >= 262144
                    maxssiz <= 401604608
Can Change          Immediately or at Next Boot


Tunable             maxssiz_64bit
Description         Maximum size of the stack segment of a 64-bit process (bytes)
Module              vm
Current Value       268435456 [Default]
Value at Next Boot  268435456 [Default]
Value at Last Boot  268435456
Default Value       268435456
Constraints         maxssiz_64bit >= 262144
                    maxssiz_64bit <= 2147483648
Can Change          Immediately or at Next Boot


Tunable             maxuprc
Description         Maximum number of processes for each non-root user
Module              pm_proc
Current Value       3686 [((nproc*9)/10)]
Value at Next Boot  3687
Value at Last Boot  3686
Default Value       256
Constraints         maxuprc >= 3
                    maxuprc <= nproc - 5
Can Change          Immediately or at Next Boot


Tunable             semmns
Description         Maximum number of semaphores
Module              pm_usync
Current Value       4096 [Default]
Value at Next Boot  4096 
Value at Last Boot  4096
Default Value       4096
Constraints         semmns >= 2
                    semmns <= 335534080
                    semmns >= semmni
                    semmns >= semume
Can Change          At Next Boot Only


For changing the Value:


# kctune maxssiz=134217728
     ==> Update the automatic 'backup' configuration first? yes
             yes     - Update backup before every change
             once    - Update backup now; ask for each future change
             no      - Don't update backup now; ask for each future change
             disable - Don't update backup before any change
     ==> Update the automatic 'backup' configuration first? yes
       * The automatic 'backup' configuration has been updated.
       * Future operations will update the backup without prompting.
       * The requested changes have been applied to the currently
         running configuration.
Tunable                Value  Expression  Changes
maxssiz  (before)    8388608  Default     Immed
         (now)     134217728  134217728


# kctune maxssiz_64bit=1073741824
       * The automatic 'backup' configuration has been updated.
       * The requested changes have been applied to the currently
         running configuration.
Tunable                       Value  Expression  Changes
maxssiz_64bit  (before)   268435456  Default     Immed
               (now)     1073741824  1073741824


# kctune maxuprc=3687
       * The automatic 'backup' configuration has been updated.
       * The requested changes have been applied to the currently
         running configuration.
Tunable            Value  Expression      Changes
maxuprc  (before)   3686  ((nproc*9)/10)  Immed
         (now)      3687  3687


# kctune semmns=8192
NOTE:    The requested changes could not be applied to the currently
         running system, for the following reasons:
         - The tunable 'semmns' cannot be changed without a reboot.
       * The requested changes have been saved, and will take effect at
         next boot.
NOTE:    No change to the tunable 'semmns' was needed.
Tunable               Value  Expression
semmns   (now)         4096  Default
         (next boot)   8192  8192


After Changing the value using kctune command, it require a reboot of the system for some of the value to get effected. As show below output.


 
# kctune -v for  maxssiz maxssiz_64bit maxuprc semmns
Tunable             maxssiz
Description         Maximum size of the stack segment of a 32-bit process (bytes)
Module              vm
Current Value       134217728
Value at Next Boot  134217728
Value at Last Boot  134217728
Default Value       8388608
Constraints         maxssiz >= 262144
                    maxssiz <= 401604608
Can Change          Immediately or at Next Boot


Tunable             maxssiz_64bit
Description         Maximum size of the stack segment of a 64-bit process (bytes)
Module              vm
Current Value       1073741824
Value at Next Boot  1073741824
Value at Last Boot  1073741824
Default Value       268435456
Constraints         maxssiz_64bit >= 262144
                    maxssiz_64bit <= 2147483648
Can Change          Immediately or at Next Boot


Tunable             maxuprc
Description         Maximum number of processes for each non-root user
Module              pm_proc
Current Value       3687
Value at Next Boot  3687
Value at Last Boot  3687
Default Value       256
Constraints         maxuprc >= 3
                    maxuprc <= nproc - 5
Can Change          Immediately or at Next Boot


Tunable             semmns
Description         Maximum number of semaphores
Module              pm_usync
Current Value       8192
Value at Next Boot  8192
Value at Last Boot  8192
Default Value       4096
Constraints         semmns >= 2
                    semmns <= 335534080
                    semmns >= semmni
                    semmns >= semume
Can Change          At Next Boot Only