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AIX Version 4.3 Commands Reference, Volume 4

restvg Command

Purpose

Restores the user volume group and all its containers and files.

Syntax

restvg [ -b Blocks ] [ -f Device ] [ -q ] [ -s ] [-n ] [-p PPsize ] [ DiskName ... ]

Description

The restvg command restores the user volume group and all its containers and files, as specified in the /tmp/vgdata/vgname/vgname.data file (where vgname is the name of the volume group) contained within the backup image created by the savevg command.

The restvg command restores a user volume group. The bosinstall routine reinstalls the root volume group (rootvg). If the restvg command encounters a rootvg volume group in the backup image, the restvg command exits with an error.

If a yes value has been specified in the EXACT_FIT field of the logical_volume_policy stanza of the /tmp/vgdata/vgname/vgname.data file, the restvg command uses the map files to preserve the placement of the physical partitions for each logical volume. The target disks must be of the same size or larger then the source disks specified in the source_disk_data stanzas of the vgname.data file.

Note: To view the files in the backup image or to restore individual files from the backup image, the user must use the restore command with the -T or -x flag, respectively. (Refer to the restore command for more information.)

Flags

-b Blocks Specifies the number of 512-byte blocks to read in a single input operation. If this parameter is not specified the default of 100 is used by the restore command. Larger values result in larger physical transfers to tape devices.
DiskName... Specifies the names of disk devices to be used instead of the disk devices listed in the vgname.data file. Target disk devices must be defined as empty physical volumes; that is, they must contain a physical volume identifier and must not belong to a volume group. If the target disk devices are new, they must be added to the system using the mkdev command. If the target disk devices belong to a volume group, they must be removed from the volume group using the reducevg command.
-f Device Specifies the device name of the backup media. The default is /dev/rmt0.
-n Specifies that the existing MAP files are ignored. The -n flag overrides the value of the EXACT_FIT field in the logical_volume_policy stanza of the vgname.data file.
-p PPsize Specifies the number of megabytes in each physical partition. If not specified, restvg uses the best value for the PPsize, dependent upon the largest disk being restored to. If this is not the same as the size specified in the vgname.data file, the number of partitions in each logical volume will be appropriately altered with respect to the new PPsize.

If a PPsize is specified that is smaller than appropriate for the disk sizes, the larger PPsize will be used.

If a PPsize is specified that is larger than appropriate for the disk sizes, the specified larger PPsize will be used.

-q Specifies that the usual prompt not be displayed before the restoration of the volume group image. If this flag is not specified, the prompt displays the volume group name and the target disk-device names.
-s Specifies that the logical volumes be created at the minimum size possible to accommodate the file systems. This size is specified by the value of LV_MIN_LPS field of the lv_data stanza of the vgname.data file (where vgname is the name of the volume group).

The -s flag overrides the values of the SHRINK and EXACT_FIT fields in the logical_volume_policy stanza of the vgname.data file. The -s flag causes the same effect as values of SHRINK=yes and EXACT_FIT=no would cause.

Examples

  1. To restore the volume group image from the /dev/rmt1 device, onto the hdisk2 and hdisk3 disks, enter: 
    restvg -f/dev/rmt1 hdisk2 hdisk3
  2. To restore the volume group image saved in /mydata/myvg file onto the disks specified in the vgname.data file contained within the backup image, enter: 
    restvg -f/mydata/myvg

Related Information

The mkvgdata command, restore command, savevg command, mkdev command, reducevg command.

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