Cloning an empty sever (except OS) onto a smaller drive? Post: 302990880

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Operating Systems Linux Red Hat Cloning an empty sever (except OS) onto a smaller drive? Post 302990880 by hicksd8 on Thursday 2nd of February 2017 06:02:10 AM

02-02-2017

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I would question why they wish to 'clone' the server in the first place. Do they have another identical hardware platform to put it on? If they clone the disk(s) I would say that they need to fully test that clone elsewhere in order to have confidence in it.

I would be inclined to research the correct disaster recovery (DR) from backup procedure for that OS. What format of backup media would be required. If the box is to become a production system then they MUST have a backup device (eg, tape drive) or a remote NFS volume to backup to. That backup (of which multiple copies could be taken e.g. for off-site storage too) could be kept indefinitely. The point you are making is that the system is the data NOT the hardware. Indeed, by definition, the DR would be designed to work on completely different hardware in case the computer room caught fire, the hardware was destroyed, and the same model hardware is no longer available. With a DR backup it would be possible to recover the system even if it took a little time. The data would be available to restore the system.

Usually, it is also important to have hardcopy of the disk layout, partition sizes, filesystem sizes, cylinder numbers, swap space, etc. That combined with a DR backup provides everything for recovery. By comparison, if you clone the system to a second drive and that drive fails (or somebody drops it on the floor) you are stuffed.

I'm not a CentOS expert but those are my thoughts in generic terms.

Last edited by hicksd8; 02-02-2017 at 03:41 PM..

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vgcfgrestore

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

NAME

       vgcfgrestore - restore volume group descriptor area

SYNOPSIS

       vgcfgrestore [-d|--debug] [-f|--file filename] [-l[l]|--list] [-h|--help] [-M|--Metadatatype1|2] [-t|--test] [-v|--verbose] VolumeGroupName

DESCRIPTION

       vgcfgrestore  allows  you  to  restore  the metadata of VolumeGroupName from a text backup file produced by vgcfgbackup.  You can specify a
       backup file with --file.  If no backup file is specified, the most recent one is used.  Use --list for a list of the available  backup  and
       archive files of VolumeGroupName.

OPTIONS

       -l | --list -- List files pertaining to VolumeGroupName
              List  metadata  backup  and  archive  files  pertaining  to VolumeGroupName.  May be used with the -f option.  Does not restore Vol-
              umeGroupName.

       -f | --file filename -- Name of LVM metadata backup file
              Specifies a metadata backup or archive file to be used for restoring VolumeGroupName.  Often this file has been created with  vgcfg-
              backup.

       See lvm for common options.

REPLACING PHYSICAL VOLUMES

       vgdisplay  --partial  --verbose will show you the UUIDs and sizes of any PVs that are no longer present.  If a PV in the VG is lost and you
       wish to substitute another of the same size, use pvcreate --restorefile filename --uuid uuid (plus additional arguments as appropriate)  to
       initialise  it with the same UUID as the missing PV.  Repeat for all other missing PVs in the VG.  Then use vgcfgrestore --file filename to
       restore the volume group's metadata.

SEE ALSO

       lvm(8), vgcreate(8)

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