SCO osr5's logical volume starting


 
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Operating Systems SCO SCO osr5's logical volume starting
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Old 05-28-2004
Question SCO osr5's logical volume starting

Hi
My query is regarding the logical volume start. I am using sco open server 5.0.7. I create 3 volumes
1. / 5000 Mb
2. /home -2000Mb
3. /sundeep -500MB

The document of SCO says that the logcal drive start from the 1st block of fs. From the disk label when i jump to the start of the partitions .I found the superblock about 273106 sectors(133mb) away the stating location og partition. The same thing happens in all the partitions.
Why this happens. I tried several times and make different size of partitions.Even i make 100mb partitions but the locations of superblock structure found after the 273106 sectors.(very amazing)

Again i tried on different system with different Hard disk(SCSI) but next time i found the super block position after the 16065 sectors from the starting of partion.

How i found this value and in which structure this value is defined.

Plesae guide me

Sundeep saini
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VGREDUCE(8)						      System Manager's Manual						       VGREDUCE(8)

NAME
vgreduce - reduce a volume group SYNOPSIS
vgreduce [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi- calVolumePath...] DESCRIPTION
vgreduce allows you to remove one or more unused physical volumes from a volume group. OPTIONS
See lvm for common options. -a, --all Removes all empty physical volumes if none are given on command line. --removemissing Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes normal operation of the volume group (new logical volumes may again be created, changed and so on). If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove them manually, you can run this option with --force to have vgreduce remove any partial LVs. Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those parts that lie on disks that are still present. If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti- vating your logical volumes with --partial as described in lvm (8). SEE ALSO
lvm(8), vgextend(8) Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) VGREDUCE(8)