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Full Discussion: Bash variable assignment failure/unary operator expected
Top Forums Shell Programming and Scripting Bash variable assignment failure/unary operator expected Post 303012714 by port43 on Wednesday 7th of February 2018 08:10:14 PM
Old 02-07-2018
Thank you for taking the time to dissect that and notice it, bakunin. I was assuming a 1:1 and, well, assume...

In past positions I always tried to make sure everything was split/mirrored 1:1 to allow for the easiest replacement/fixing. I failed to consider that not all systems are as they should be. Smilie

I REALLY appreciate you pointing that out because it could have really bitten me in the ass.
 

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LEARN ABOUT HPUX

lvsplit

lvsplit(1M)															       lvsplit(1M)

NAME

       lvsplit - split mirrored LVM logical volume into two logical volumes

SYNOPSIS

       autobackup] suffix] PhysicalVolumeGroup] lv_path ...

   Remarks
       If  the	logical  volume input arguments belong to a combination of volume groups version 1.0 and 2.0 or higher, the arguments might not be
       processed in the order they are listed on the command line.

       This command requires the installation of the optional HP MirrorDisk/UX software (not included in  the  standard  HP-UX	operating  system)
       before it can be used.

DESCRIPTION

       The command splits a mirrored logical volume, lv_path, into two logical volumes.  A second logical volume is created containing one copy of
       the data.  The original logical volume is appropriately reset to have one fewer mirror copies.

       If the option is specified, the new logical volume name has the form lv_pathsuffix.  If is not specified, suffix defaults to as in

       If more than one lv_path is specified on the command line, ensures that all logical volumes are brought	offline  together  in  one  system
       call,  ensuring predictable results among the logical volumes.  All logical volumes must belong to the same volume group.  The current num-
       ber of logical volumes in the volume group added to the number of logical volumes specified on the command line must not exceed the maximum
       number of logical volumes allowed in the volume group.

       If  PhysicalVolumeGroup	is specified, the offline logical volumes are created using the mirror copies on the physical volumes contained in
       the specified physical volume group.

       When a mirrored logical volume of a non-shared volume group is split into two logical volumes, a bit map is stored that keeps track of  all
       writes  to either logical volume in the split pair.  If the volume group is shared, this bit map is not created.  When the two logical vol-
       umes are subsequently merged using the bit map, if present, is used to decide which areas of the logical volumes need to be  resynchronized
       (see lvmerge(1M)).  This bit map remains in existence until one of the following conditions occurs:

	      o  The merge is completed.

	      o  One of the logical volumes is extended, reduced, or split again.

	      o  The volume group is cross-activated to shared mode (see vgchange(1M)).

	      o  The system is rebooted.

       The new logical volume must be checked with the command before it is mounted (see fsck(1M)).  flushes the file system to a consistent state
       except for pipes and unlinked but open files.

       To rejoin two split copies of a logical volume, use the command (see lvmerge(1M)).

   Options and Arguments
       recognizes the following options and arguments:

	      lv_path		  The block device path name of a logical volume.  Multiple logical volumes in the same volume group can be speci-
				  fied.   The  current number of logical volumes in the volume group added to the number of logical volumes speci-
				  fied on the command line must not exceed the maximum number of logical volumes allowed in the volume group.

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

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

					 After this command executes, the command (see vgcfgbackup(1M)) is executed for the volume group to  which
					 the logical volume belongs.

				  Do not back up configuration changes this time.

	      The offline logical volumes will be created using the mirror copies
				  on the physical volumes in the specified PhysicalVolumeGroup.

	      Specify the suffix to use to identify the new logical volume.
				  The new logical volume name has the form lv_pathsuffix.  If is omitted, suffix defaults to as in

   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 is issued, it creates the new logical volume device special files on all the nodes sharing the volume group.  The device special files
       are created with the same name on the nodes sharing the volume group.

       When  a	node wants to share the volume group, the user must first execute a if logical volumes were split at the time the volume group was
       not activated on that node.

       The logical volumes device special files should have the same name on all the nodes sharing the volume group.

       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

       Split the mirrored logical volume into two copies.  Call the new logical volume

       Split the mirrored logical volume into two copies.  The offline logical volume will be created using the mirror copy on the  physical  vol-
       umes contained in the physical volume group

       Split an online logical volume which is currently mounted on so that a backup can take place:

	      Perform a backup operation, then:

       Split two logical volumes at the same time:

	      Perform a backup operation on the split logical volumes, then rejoin them:

SEE ALSO

       lvcreate(1M), lvextend(1M), lvmerge(1M), lvmpud(1M).

						    Requires Optional HP MirrorDisk/UX Software 				       lvsplit(1M)
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