1. Determine the disk's associated device file. To show the disks attached to the system and their
device file names, enter the ioscan command with the -f, -N, and -n options.
#-> cat >ldev
6D:6F
6D:70
6D:71
6D:72
Execute the xpinfo to collect the ldev and array information.
#/usr/contrib/bin/xpinfo -il >xpinfo.out
#collect
#-> cat ldev|while read i
> do
> cat xpout.info |grep -i $i |grep -i 66657
> done
/dev/rdisk/disk68 d1 --- 9e CL6R 6d:6f OPEN-V 00066657
/dev/rdisk/disk72 d1 --- 9f CL6R 6d:70 OPEN-V 00066657
/dev/rdisk/disk73 dc --- a0 CL5R 6d:71 OPEN-V 00066657
/dev/rdisk/disk66 dc --- a1 CL5R 6d:72 OPEN-V 00066657
#-> cat >rdisk
/dev/rdisk/disk68
/dev/rdisk/disk72
/dev/rdisk/disk73
/dev/rdisk/disk66
Once disk are sure that not part of any lvm configuration.
#-> strings /etc/lvmtab|grep -iE "disk68|disk72|disk73|disk66"
#-> cat rdisk |sed "s/rdisk/disk/" |while read i
> do
> strings /etc/lvmtab |grep -w $i
> done
#-> cat rdisk |sed "s/rdisk/disk/" |while read i
> do
> pvdisplay $i
> done
pvdisplay: Couldn't find the volume group to which
physical volume "/dev/disk/disk68" belongs.
pvdisplay: Cannot display physical volume "/dev/disk/disk68".
pvdisplay: Couldn't find the volume group to which
physical volume "/dev/disk/disk72" belongs.
pvdisplay: Cannot display physical volume "/dev/disk/disk72".
pvdisplay: Couldn't find the volume group to which
physical volume "/dev/disk/disk73" belongs.
pvdisplay: Cannot display physical volume "/dev/disk/disk73".
pvdisplay: Couldn't find the volume group to which
physical volume "/dev/disk/disk66" belongs.
pvdisplay: Cannot display physical volume "/dev/disk/disk66".
#-> cat rdisk |while read i
> do
> pvcreate $i
> done
Physical volume "/dev/rdisk/disk68" has been successfully created.
Physical volume "/dev/rdisk/disk72" has been successfully created.
Physical volume "/dev/rdisk/disk73" has been successfully created.
Physical volume "/dev/rdisk/disk66" has been successfully created.
2. Create a directory for the volume group. For example:
# mkdir /dev/vgname
#mkdir /dev/vg_testdata
By convention, vgname is vgnn, where nn is a unique number across all volume groups.
However, you can choose any unique name up to 255 characters.
3. Create a device file named group in the volume group directory with the mknod command.
For example:
# mknod /dev/vgname/group c major 0xminor
#-> mknod /dev/vg_test/group c 64 0x280000
The c following the device file name specifies that group is a character device file.
major is the major number for the group device file. For a Version 1.0 volume group, it is
64. For a Version 2.x volume group, it is 128.
4. To create a Version 1.0 volume group, use the vgcreate command, specifying each physical
volume to be included. For example:
#->cp -p /etc/lvmab /etc/lvmab.mmddyyyy
#-> vgcreate /dev/vg_test /dev/disk/disk68 /dev/disk/disk72 /dev/disk/disk73 /dev/disk/disk66
Increased the number of physical extents per phy
sical volume to 12800.
Volume group "/dev/vg_test" has been successfully created.
Volume Group configuration for /dev/vg_test has been saved in /etc/lvmconf/vg_test.conf
You can set volume group attributes using the following options:
-V 1.0 Version 1.0 volume group (default)
-s pe_size Size of a physical extent in MB (default 4)
-e max_pe Maximum number of physical extents per physical volume (default 1016)
-l max_lv Maximum number of logical volumes (default 255)
-p max_pv Maximum number of physical volumes (default 255)
The size of a physical volume is limited by pe_size times max_pe. If you plan to assign a disk
larger than approximately 4 GB (1016 * 4 MB) to this volume group, use a larger value of pe_size
or max_pe.
#-> vgcreate -l 255 -p 255 -s 128 -e 10000 /dev/vg_test /dev/disk/disk68
Volume group "/dev/vg_test" has been successfully created.
Volume Group configuration for /dev/vg_test has been saved in /etc/lvmconf/vg_test.conf
Check the attribute of Volume group:
#-> vgdisplay /dev/vg_test
--- Volume groups ---
VG Name /dev/vg_test
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 0
Open LV 0
Max PV 16
Cur PV 4
Act PV 4
Max PE per PV 12800
VGDA 8
PE Size (Mbytes) 4
Total PE 51196
Alloc PE 0
Free PE 51196
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0
VG Version 1.0
VG Max Size 800g
VG Max Extents 204800
5. Add the physical volume to the volume group using the vgextend command and the block
file for the disk. For example:
#-> vgextend /dev/vg_test /dev/disk/disk72 /dev/disk/disk73 /dev/disk/disk66
Volume group "/dev/vg_test" has been successfully extended.
Volume Group configuration for /dev/vg_test has been saved in /etc/lvmconf/vg_test.conf
#-> vgdisplay -v /dev/vg_test
--- Volume groups ---
VG Name /dev/vg_test
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 0
Open LV 0
Max PV 16
Cur PV 4
Act PV 4
Max PE per PV 12800
VGDA 8
PE Size (Mbytes) 4
Total PE 51196
Alloc PE 0
Free PE 51196
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0
VG Version 1.0
VG Max Size 800g
VG Max Extents 204800
--- Physical volumes ---
PV Name /dev/disk/disk68
PV Status available
Total PE 12799
Free PE 12799
Autoswitch On
Proactive Polling On
PV Name /dev/disk/disk72
PV Status available
Total PE 12799
Free PE 12799
Autoswitch On
Proactive Polling On
PV Name /dev/disk/disk73
PV Status available
Total PE 12799
Free PE 12799
Autoswitch On
Proactive Polling On
PV Name /dev/disk/disk66
PV Status available
Total PE 12799
Free PE 12799
Autoswitch On
Proactive Polling On
6. To create a logical volume, follow these steps:
6.1 Decide how much disk space the logical volume needs. Calculate the size of the LV and decide the name of LV : example:
#-> lvcreate -i 4 -I 128 -n Lv_test /dev/vg_test
Logical volume "/dev/vg_test/Lv_test" has been successfully created with
character device "/dev/vg_test/rLv_test".
Volume Group configuration for /dev/vg_test has been saved in /etc/lvmconf/vg_test.conf
6.2 Allocate 1GB to the logical volume
#-> lvextend -L 1024M /dev/vg_test/Lv_test
Logical volume "/dev/vg_test/Lv_test" has been successfully extended.
Volume Group configuration for /dev/vg_test has been saved in /etc/lvmconf/vg_test.conf
#-> lvdisplay /dev/vg_test/Lv_test
--- Logical volumes ---
LV Name /dev/vg_test/Lv_test
VG Name /dev/vg_test
LV Permission read/write
LV Status available/syncd
Mirror copies 0
Consistency Recovery MWC
Schedule striped
LV Size (Mbytes) 1024
Current LE 8
Allocated PE 8
Stripes 4
Stripe Size (Kbytes) 128
Bad block on
Allocation strict
IO Timeout (Seconds) default
7. To create a logical volume run newfs to raw lv
#-> newfs -F vxfs -o largefiles -b 8192 /dev/vg_test/rLv_test
version 7 layout
1048576 sectors, 131072 blocks of size 8192, log size 2048 blocks
largefiles supported
8. Check the type of file system. For example:
#-> /usr/sbin/fstyp /dev/vg_test/rLv_test
Vxfs
#-> /usr/sbin/fstyp -v /dev/vg_test/rLv_test
vxfs
version: 7
f_bsize: 8192
f_frsize: 8192
f_blocks: 131072
f_bfree: 128863
f_bavail: 127857
f_files: 32224
f_ffree: 32192
f_favail: 32192
f_fsid: 1076363265
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 16
f_fsindex: 10
f_size: 131072
9. Create a mount point for mouting of Logical Volume.
#mkdir /oracle/Test
10. Mount /dev/vg_test/Lv_test on /oracle/Test with correct option as per performance guidelines.
#-> mount /dev/vg_test/Lv_test /test
#-> bdf /test
Filesystem kbytes used avail %used Mounted on
/dev/vg_test/Lv_test
1048576 17672 1022864 2% /test
11. Check the mount option from mnttab.
#-> mount -v |grep -i test
/dev/vg_test/Lv_test on /test type vxfs ioerror=mwdisable,largefiles,delaylog,dev=40280001 on Tue Jul 8 08:57:31 2014
12. Check the load balancing for the disk
For 11iv3 systems make sure the load balance policy is also set on the newly added disk:
Verify LB policy: scsimgr -p get_attr all_lun -a device_file -a load_bal_policy
Set LB policy on all disks: scsimgr save_attr -N "/escsi/esdisk" -a load_bal_policy=<LB policy>
Set LB policy on one disk : scsimgr save_attr -D /dev/rdisk/disk530 -a load_bal_policy=<LB policy>
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