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what disks are in the
root volume group
# lsvg -p rootvg rootvg: PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION hdisk0 active 546 186 00..00..00..77..109
Now let's see how many
disks are on the system
# lspv hdisk0 00cf4f5d02a3c139 rootvg active hdisk1 00cf4f5da1ca9590 none #
Add a disk to the root volume group (extend the volume group) extendvg <vg> <disk#>
# extendvg -f rootvg hdisk1
lsvg -p <vg>
Make sure the
disks are in an active state
# lspv hdisk0 00cf4f5d02a3c139 rootvg active hdisk1 00cf4f5da1ca9590 rootvg active
Mirror athe logical volumes that exist on a given volume group
# /usr/sbin/mirrorvg rootvg hdisk0 hdisk1 0516-1124 mirrorvg: Quorum requirement turned off, reboot system for this to take effect for rootvg. 0516-1126 mirrorvg: rootvg successfully mirrored, user should perform bosboot of system to initialize boot records. Then, user must modify bootlist to include: hdisk0 hdisk1.
Create the boot image on the new disk and put it on the bootlist
# bosboot -ad /dev/hdisk1 bosboot: Boot image is 25166 512 byte blocks. bootlist -m normal hdisk0 hdisk1
# lsvg -p rootvg rootvg: PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION hdisk1 active 546 186 00..00..00..77..109 hdisk0 active 546 186 00..00..00..77..109
Logical Volume Manager
During the early stages of UNIX®, the management of physical disks was always a daunting task because of the restrictions on allocating the actual physical space. You'd have to define physical partitions, and each physical partition would actually be of a fixed size. Additionally, a physical disk could only have eight physical partitions, so the customer had to select the correct size of each partition before installing the system.
A major restriction of the physical partition was that each partition had to be contiguous; meaning you could not span multiple drives. What evolved from this messy picture was a new, flexible technique to manage the allocation, known as logical volumes. Here are some of the benefits:
AIX and Solaris offer different methods for using logical volumes. With Solaris, it does not come ready out of the box. You need to determine which LVM to use, and decide whether or not to use SVM or VERITAS. While VERITAS offers the VERITAS Foundation suite for AIX 5L™, it is typically not used in AIX environments, as it is not necessary. VERITAS Volume Manager (VxVM) is a storage management subsystem that enables you to manage physical disks as logical devices called volumes. It is important to reiterate that this product is third-party software, and you will pay handsomely for it.
The LVM has been a feature of the AIX operating system since Version 3, and it is installed automatically with the operating system. Table 1 helps lay out some of the differences between AIX and VERITAS, and it also compares the commands (for the complete table, see Resources). While the version numbers might be different, the concepts and commands remain the same.
Figure 1 illustrates how the physical disk relates to the actual logical partitions.
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