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Full Discussion: /dev/Null error
Operating Systems HP-UX /dev/Null error Post 302583770 by sris.sun on Wednesday 21st of December 2011 08:15:16 AM
Old 12-21-2011
/dev/Null error
This code or command is used to test the network load, I mean we are just creating a load with out any disk usage in to the network, say some thing like loopback.
and with put command we get the execution of the command from source to destination.

"|dd if=/dev/zero bs=8k count=1000000" - creates 8GB of load with all Zero's
Put - normal put command
/dev/null - Null device used as destination. to send all data created to null device
 

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LEARN ABOUT HPUX

vgmove

vgmove(1M)																vgmove(1M)

NAME

       vgmove - move data from an old set of disks in a volume group to a new set of disks

SYNOPSIS

       autobackup] diskmapfile vg_name

       autobackup] diskfile diskmapfile vg_name

DESCRIPTION

       The command migrates data from the existing set of disks in a volume group to a new set of disks. After the command completes successfully,
       the new set of disks will belong to the same volume group. The command is intended to migrate data on a volume group from  old  storage	to
       new storage.  The diskmapfile specifies the list of source disks to move data from, and the list of destination disks to move data to.  The
       user may choose to list only a subset of the existing physical volumes in the volume group that need to be migrated to a new set of  disks.
       The format of the diskmapfile file is shown below:

	      source_pv_1 destination_pv_1_1 destination_pv_1_2 ....
	      source_pv_2 destination_pv_2_1 destination_pv_2_2 ....
	       ....
	      source_pv_n destination_pv_n_1 destination_pv_n_2 ....

       If  a destination disk is not already part of the volume group, it will be added using see vgextend(1M).  Upon successful completion of the
       source disk will be automatically removed from the volume group using see vgreduce(1M).

       After successful migration, the destination disks are added to the LVM configuration files; namely, or The source disks	along  with  their
       alternate links are removed from the LVM configuration files.

       A sample diskmapfile is shown below:

	      /dev/disk/disk1 /dev/disk/disk51 /dev/disk/disk52
	      /dev/disk/disk2 /dev/disk/disk51
	      /dev/disk/disk3 /dev/disk/disk53

       The  diskmapfile  can  be  manually created, or it can be automatically generated using the diskfile and diskmapfile options.  The argument
       diskfile contains a list of destination disks, one per line such as the sample file below:

	      /dev/disk/disk51
	      /dev/disk/disk52
	      /dev/disk/disk53

       When the option is given, reads a list of destination disks from diskfile, generates the source to destination mapping,	and  saves  it	to
       diskmapfile.

       The  volume  group must be activated before running the command.  If the command is interrupted before it completes, the volume group is in
       the same state it was at the beginning of the command.  The migration can be continued by running the command with  the	same  options  and
       disk mapping file.

   Options and Arguments
       The command recognizes the following options and arguments:

	      vg_name		  The path name of the volume group.

	      Set automatic backup for this invocation of
				  autobackup can have one of the following values:

				  Automatically back up configuration changes made to the volume group.
					 This is the default.

					 After this command executes, the command is executed for the volume group; see vgcfgbackup(1M).

				  Do not back up configuration changes this time.

	      Specify the name of the file containing the
				  source  to destination disk mapping.	If the option is also given, will generate the disk mapping and save it to
				  this filename.  (Note that if the diskmapfile already exists, the file will be  overwritten).   Otherwise,  will
				  perform the data migration using this diskmapfile.

	      Specify the name of the file containing the
				  list of destination disks.  This option is used with the option to generate the diskmapfile.

				  When the option is used, no volume group data is moved.

	      Preview the actions to be taken but do not
				  move any volume group data.

   Shared Volume Group Considerations
       For  volume  group  version 1.0 and 2.0, cannot be used if the volume group is activated in shared mode.  For volume groups version 2.1 (or
       higher), can be performed when activated in either shared, exclusive, or standalone mode.

       Note that the daemon must be running on all the nodes sharing a volume group activated in shared mode.  See lvmpud(1M).

       When a node wants to share the volume group, the user must first execute a if physical volumes were moved in or out of the volume group	at
       the time the volume group was not activated on that node.

       LVM shared mode is currently only available in Serviceguard clusters.

EXTERNAL INFLUENCES

   Environment Variables
       determines the language in which messages are displayed.

       If is not specified or is null, it defaults to "C" (see lang(5)).

       If any internationalization variable contains an invalid setting, all internationalization variables default to "C" (see environ(5)).

EXAMPLES

       Move data in volume group from to After the migration, remove from the volume group:

       Generate a source to destination disk map file for where the destination disks are and

SEE ALSO

       lvmpud(1M), pvmove(1M), vgcfgbackup(1M), vgcfgrestore(1M), vgextend(1M), vgreduce(1M), intro(7), lvm(7).

																	vgmove(1M)
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