HP StorageWorks XP24000 Configuration Manual page 27

lvreduce
CAUTION:
Data within the file system can be lost after execution of lvreduce.
Create logical volumes after you create volume groups. A logical volume must be created for each
new SCSI disk device
To create logical volumes:
1. Use the lvcreate –L command to create a logical volume.
Specify the volume size (in megabytes) and the volume group for the new logical volume. HP-UX
assigns the logical volume numbers automatically (lvol1, lvol2, lvol3). Use the following capacity
values for the size parameter:
OPEN-K = 1740
OPEN-3 = 2344
OPEN-8 = 7004
OPEN-9 = 7004
OPEN-E = 13888
OPEN-L = 34756
OPEN-V = 61432
To calculate S1 for CVS, LUSE, and CVS LUSE volumes, first use the vgdisplaycommand to display
the physical extent size (PE Size) and usable number of physical extents (Free PE) for the volume.
Calculate the maximum size value (in MB) as follows:
S1 = (PE Size) × (Free PE)
Logical volumes can span multiple physical volumes. Use the diskinfo command for extended
LUNs.
2. Create an OPEN-3 logical volume the size of the physical volume, using 2344 for the size
parameter. An OPEN-9 volume uses 7040 for the size parameter to create a logical volume the
size of the physical volume.
Example
# lvcreate –L 2344 /dev/vg06
Logical volume "/dev/vg06/lvol1" has been successfully created with
Example
Decreases the size of an existing logical volume. Any file system attached
to the logical volume must be unmounted before executing the lvreduce
command.
Example
XP Disk Array Configuration Guide for HP-UX
lvextend –L size /dev/vgnn/lvolx
lvreduce –L size /dev/vgnn/lvolx
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