Use the shrinkvdisksize command to reduce
the size of a volume by the specified capacity.
Syntax
shrinkvdisksize [ { -size size_change | -rsize size_change [ -copy id ] } ] [ -unit { b | kb | mb | gb | tb | pb } ] { vdisk_name | vdisk_id }
Parameters
- -sizesize_change
- (Optional) Specifies the size reduction (change in size) for the designated volume. The -size parameter cannot be used with the
-rsize parameter. You must specify either -size or
-rsize.
Important: This parameter does reduce the size of a
volume (the specified virtual size capacity).
- -rsizesize_change
- (Optional) Reduces the real size of a thin-provisioned
volume by the specified amount. This indicates the change in size
as a result of the reduction. Specify the size_change value
using an integer. Specify the units for a size_change integer
using the -unit parameter; the default is MB.
You must specify either -rsize or -size.
- -copyid
- (Optional) Specifies the copy to change the real
capacity for. You must also specify the -rsize parameter.
If the -copy parameter is not specified, all
copies of the volume are reduced. This parameter is required if
the volume is mirrored and only one copy is thin-provisioned.
- -unitb | kb | mb | gb |
tb | pb
- (Optional) Specifies the data units to be used in conjunction
with the value that is specified by the -size parameter.
- vdisk_name | vdisk_id
- (Required) Specifies the volume that you want to modify, either
by ID or by name.
Description
The shrinkvdisksize command reduces the capacity that is allocated to the
particular volume by the amount that you specify. You cannot shrink the real size of a
thin-provisioned volume below its used size. All capacities, including changes, must be in multiples
of 512 bytes. An entire extent is reserved even if it is only partially used. The default capacity
units are MB. You cannot use shrinkvdisksize if the volume
is fast formatting.
The command can be used to shrink the physical capacity that is allocated
to a particular volume by the specified amount. The command can also be used to shrink the virtual
capacity of a thin-provisioned volume without altering the physical capacity assigned to the volume.
To change the capacity of a non-thin-provisioned disk, use the -size parameter.
To change the real capacity of a thin-provisioned disk, use the -rsize
parameter. To change the virtual capacity of a thin-provisioned disk, use the
-size parameter.
Volumes can be reduced in size, if required.
When
the virtual size of a thin-provisioned volume is changed, the warning
threshold is automatically scaled to match. The new threshold is stored
as a percentage.
To run the shrinkvdisksize command
on a mirrored volume, all copies of the volume must be synchronized.
Attention: If the volume contains data that is being used, do
not shrink the volume without backing up the data first.
The
clustered system (system) arbitrarily reduces the capacity of the
volume by removing a partial, one or more extents from those allocated
to the volume. You cannot control which extents are removed and so
you cannot assume that it is unused space that is removed.
Remember: Before you shrink a volume, validate
that the volume is not mapped to any host objects.
You
can determine the exact capacity of the source or master volume by
issuing the lsvdisk -bytesvdiskname command.
Shrink the volume by the required amount by issuing the shrinkvdisksize
-sizesize_change-unit b
| kb | mb | gb | tb | pbvdisk_name | vdisk_id command.
Remember: - You cannot resize (shrink) an image mode volume.
- You cannot resize (shrink) the disk if the volume contains data.
- You cannot resize (shrink) a volume that is part of a file system.
- You cannot
resize (shrink) volume if that volume is being formatted.
- You cannot resize (shrink) a volume that is being migrated.
- You can not resize (shrink) a volume if cloud
snapshot is enabled on that volume.
This command is supported for volumes in
Metro Mirror and Global Mirror relationships that are in
consistent_synchronized
state if those volumes are using thin-provisioned or compressed copies. This command is not
supported for volumes:
- In HyperSwap relationships or in Global Mirror
relationships that are operating in cycling mode
- In relationships where that volume has a Change Volume configured
- That have a fully-allocated copy
You must shrink both volumes in a relationship to maintain full operation of the system. To perform this:
- Shrink the secondary volume by the required capacity
- Shrink the primary volume by the required capacity
An invocation example to decrease the capacity of vdisk1 by 2 KB
shrinkvdisksize -size 2048 -unit b vdisk1
The
resulting output:
No feedback
An invocation example to decrease the capacity of vdisk2 by 100 MB
shrinkvdisksize -size 100 -unit mb vdisk2
The
resulting output:
No feedback
An invocation example
to decrease the real capacity of thin-provisioned vdisk3 by 100 MB
without changing its virtual capacity
shrinkvdisksize -rsize 100 -unit mb vdisk3
The
resulting output:
No feedback
An invocation example
to decrease the real capacity of thin-provisioned VDisk copy ID 1 of
mirrored vdisk3 by 100 MB
shrinkvdisksize -rsize 100 -unit mb -copy 1 vdisk4
The
resulting output:
No feedback
An invocation example to decrease the
virtual capacity of thin-provisioned vdisk5 by 1 GB
without changing its real capacity
shrinkvdisksize -size 1 -unit gb vdisk5
The
resulting output:
No feedback