HP StorageWorks XP12000 HP StorageWorks XP Disk Array Configuration Guide: HP- - Page 24

S1 = PE Size × Free PE, Data within the file system can be lost after execution

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lvreduce -L size /dev/vgnn/lvolx 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 vgdisplay command 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 character device "/dev/vg06/rlvol1". Logical volume "/dev/vg06/lvol1" has been successfully extended. Volume Group configuration for /dev/vg06 has been saved in /etc/1vmconf/vg06.conf. 24 Installing and configuring HP-UX for the XP disk array

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lvreduce
–
L size /dev/vgnn/lvolx
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 vgdisplay command 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
character device "/dev/vg06/rlvol1".
Logical volume "/dev/vg06/lvol1" has been successfully extended.
Volume Group configuration for /dev/vg06 has been saved in
/etc/1vmconf/vg06.conf.
Installing and configuring HP-UX for the XP disk array
24