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Full Discussion: LVM extent size
Operating Systems Linux LVM extent size Post 302469236 by zaxxon on Friday 5th of November 2010 05:38:48 AM
Old 11-05-2010
From the man page of vgcreate:
Code:
       -s, --physicalextentsize PhysicalExtentSize[kKmMgGtT]
              Sets  the  physical  extent size on physical volumes of this volume group.  A size suffix (k for kilobytes up to t
              for terabytes) is optional, megabytes is the default if no suffix is present.  The default is 4 MB and it must  be
              at least 1 KB and a power of 2.

              Once this value has been set, it is difficult to change it without recreating the volume group which would involve
              backing up and restoring data on any logical volumes.  However, if no extents need moving for  the  new  value  to
              apply, it can be altered using vgchange -s.
...

It can not even only be different on distributions but even for Volume Groups on the same machine, if people used different values.
 

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LEARN ABOUT SUSE

pvck

PVCK(8) 						      System Manager's Manual							   PVCK(8)

NAME

       pvck - check physical volume metadata

SYNOPSIS

       pvck [-d|--debug] [-h|--help] [-v|--verbose] [--labelsector] PhysicalVolume [PhysicalVolume...]

DESCRIPTION

       pvck checks physical volume LVM metadata for consistency.

OPTIONS

       See lvm for common options.

       --labelsector sector
	      By  default, 4 sectors of PhysicalVolume are scanned for an LVM label, starting at sector 0.  This parameter allows you to specify a
	      different starting sector for the scan and is useful for recovery situations.  For example, suppose the partition table is corrupted
	      or  lost	on  /dev/sda, but you suspect there was an LVM partition at approximately 100 MB.  This area of the disk may be scanned by
	      using the --labelsector parameter with a value of 204800 (100 * 1024 * 1024 / 512 = 204800):

	      pvck --labelsector 204800 /dev/sda

	      Note that a script can be used with --labelsector to automate the process of finding LVM labels.

SEE ALSO

       lvm(8), pvcreate(8), pvscan(8) vgck(8)

Sistina Software UK					 LVM TOOLS 2.02.67(2) (2010-06-04)						   PVCK(8)
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