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Full Discussion: Question about lvm file creation
Top Forums UNIX for Dummies Questions & Answers Question about lvm file creation Post 302925865 by ongoto on Wednesday 19th of November 2014 07:47:22 PM
Old 11-19-2014
Hi stew
Code:
# Generate a list of device names that exist on your machine.
disk_list=$(ls /dev/sd[b-z])
for disk in $disk_list
do
# Avoid pvcreate risk!!
echo pvcreat $disk
done

This will generate a list of device names based on devices present on your machine, and then create the physical volumes if you remove 'echo '. Be sure of what you are doing! You can always remove volumes with pvremove if you mess up but your data on those drives will be gone!
Quote:
So what my understanding is first it is checking the disk under /dev sdb,sdc,sdd,...sdz whether 25 disk are existing
if not then its creating the 25 physical volume.
No. If they DO exist the volumes will be created. pvcreate will fail if the devices are not present.
Code:
#!/bin/ksh
disk_list=$(ls /etc/mylocal/ab[a-c])
...
...

This code is pointless! Why have two identical lists? /etc/mylocal is where the disk names would come from, not where they are going.

Not sure where you got this script, but you shouldn't use it! Be very picky about which drives/partitions you use for an LVM and make sure you don't have important data on them!
Last edited by ongoto; 11-19-2014 at 09:15 PM.. Reason: added caveat
 

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LEARN ABOUT OSX

pvchange

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

NAME

       pvchange - change attributes of a physical volume

SYNOPSIS

       pvchange  [--addtag  Tag]  [-A|--autobackup y|n] [-d|--debug] [-f|--force] [--deltag Tag] [--metadataignore y|n] [-h|-?|--help] [-t|--test]
       [-v|--verbose] [-a|--all] [-x|--allocatable y|n] [-u|--uuid] [PhysicalVolumePath...]

DESCRIPTION

       pvchange allows you to change the allocation permissions of one or more physical volumes.

OPTIONS

       See lvm for common options.

       -a, --all
	      If PhysicalVolumePath is not specified on the command line all physical volumes are searched for and used.

       --metadataignore  y|n
	      Ignore or un-ignore metadata areas on this physical volume.  If metadata areas on a physical volume are ignored, LVM  will  not  not
	      store metadata in the metadata areas present on this Physical Volume.

       -u, --uuid
	      Generate new random UUID for specified physical volumes.

       -x, --allocatable y|n
	      Enable or disable allocation of physical extents on this physical volume.

Example
       "pvchange -x n /dev/sdk1" disallows the allocation of physical extents on this physical volume (possibly because of disk errors, or because
       it will be removed after freeing it.

SEE ALSO

       lvm(8), pvcreate(8)

Sistina Software UK					 LVM TOOLS 2.02.95(2) (2012-03-06)					       PVCHANGE(8)
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