Is it possible to extend PV

Operating Systems Linux Red Hat Is it possible to extend PV

06-11-2017

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Is it possible to extend PV

Hello,

I have redhat and centos systems that I've only been able to grow the VG by adding more disks. I've been searching the web for a way to extend a volume group by growing the physical disk only and not having to add a second disk. Is it possible?

I can do this with AIX, by just inceasing the size of the underlying LUN, then execute the chvg command. The Volume group will detect the lun increase and that space will be available to the lv and fs without having to reboot.

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vgchgid

vgchgid(1M)															       vgchgid(1M)

NAME

       vgchgid - modify the Volume Group ID (VGID) on a given set of physical devices

SYNOPSIS

       PhysicalVolumePath [PhysicalVolumePath] ...

DESCRIPTION

       The command is designed to change the LVM Volume Group ID (VGID) on a supplied set of disks.  will work with any type of storage, but it is
       primarily targeted at disk arrays that are able to create "snapshots" or "clones" of mirrored LUNs.  accepts a set of raw physical  devices
       and ensures that they all belong to the same volume group, before altering the VGID (see section).

       The  same  VGID	is set on all the disks and it should be noted that in cases of multi-PV volume groups, all the physical volumes should be
       supplied in a single invocation of the command.

   Options
       recognizes the following options and arguments:

	      PhysicalVolumePath  The raw devices path name of a physical volume.

   Background
       Some storage subsystems have a feature which allows a user to split off a set of mirror copies of physical storage (termed or just  as  LVM
       splits  off  logical volumes with the command.  As the result of the "split," the split-off devices will have the same VGID as the original
       disks.  is needed to modify the VGID on the BCV devices.  Once the VGID has been altered, the BCV disks can be imported into a  new  volume
       group by using

WARNINGS

       Once  the  VGID	has been changed, the original VGID is lost until a disk device is re-mirrored with the original devices.  If is used on a
       subset of disk devices (for example, two out of four disk devices), the two groups of disk devices would not be able to	be  imported  into
       the same volume group since they have different VGIDs on them.  The solution is to re-mirror all four of the disk devices and re-run on all
       four BCV devices at the same time, and then use to import them into the same new volume group.

       If a disk is newly added to an existing volume group and no subsequent LVM operations has been performed to alter the structures (in  other
       words,  operations  which  perform an automated vgcfgbackup(1M)); then it is possible a subsequent will fail.  It will report that the disk
       does not belong to the volume group. This may be overcome by performing a structure changing operation on the volume  group  (for  example,
       using

       It is the system administrator's responsibility to make sure that the devices provided in the command line are all Business Copy volumes of
       the existing standard physical volumes and are in the ready state and writable.	Mixing the standard and BC  volumes  in  the  same  volume
       group can cause data corruption.

RETURN VALUE

       returns the following values:

	      0  VGID was modified with no error
	      1  VGID was not modified

EXAMPLES

       An example showing how might be used:

       1. The system administrator uses the following commands to create the Business Continuity (BCV or BC) copy:

	  1)	 For EMC Symmetrix disks, the commands are and

	  2)	 For XP disk array, the commands are and

	  Three BCV disks are created.

       2. Change the VGID on the BCV disks.

       3. Make a new volume group using the BCV disks.

	  This	step can be skipped as the group file will be created automatically.  If the file is manually created it will have different major
	  and minor numbers (see lvm(7)).

       4. Import the BCV disks into the new volume group.

       5. Activate the new volume group.

       6. Backup the new volume group's LVM data structure.

       7. Mount the associated logical volumes.

SEE ALSO

       vgimport(1M), vgscan(1M), vgcfgbackup(1M).

																       vgchgid(1M)

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