LVM Partition LVM
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Storage Allocation add a new LUN using EMC powerpath
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Process is raise a new storage request for additional disks. On allocation of the disks from storage team.
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1.Pre-Backup
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------take powermt backup pre---
-------take fdisk backup pre----
----Take various backup of all
fdisk -l 2>/dev/null | egrep ^Disk | egrep -v 'dm-' >/home/nyada01/fdisk.pre
powermt display dev=all >/home/nyada01/powermt.pre
df -Ph > df.Ph.pre
fdisk -l > fdisk.l.pre
pvs > pvs.pre
vgs > vgs.pre
lvs > lvs.pre
cat /etc/fstab >fstab.pre
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2.Scan the server for newly allocated disks
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--A.)Find out how many SCSI controller configured
ls /sys/class/scsi_host/
--B.)Use systool command to see active HBA link
systool -c fc_host -v
tail /var/log/messages in duplicate window to see any changes to disk detected in logs simultaneously.
Based on the systool output above scan the HBA ports for new disks.
--C.)Scan the SCSI disks
echo "- - -" > /sys/class/scsi_host/host*/scan
Please use the SCSI controller number in place of * above & run the command seperately.
--D.)Take fdisk & powermt backup post
fdisk -l 2>/dev/null | egrep ^Disk | egrep -v 'dm-' >/home/nyada01/fdisk.post
powermt display dev=all >/home/nyada01/powermt.post
powermt config
powermt save
--E.)check the difference between pre & post for fdisk & powermt
cd /home/nyada01/
diff fdisk.pre fdisk.post
diff powermt.pre powermt.post
Note:If you are still not able to find the new disk then issue the following command.
echo "1" > /sys/class/fc_host/host/issue_lip
Issue fdisk –l command to see if any new disks are detected.
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3.LVM Creation
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A.)Now create a physical volume
pvcreate /dev/emcpowere
B.)Volume Group create
vgcreate ny01vg /dev/emcpowere
Use 'vgextend' to add an initialized physical volume to an existing volume group.
# vgextend my_volume_group /dev/hdc1
C.)Logical Volume Creation
lvcreate -L 980G -n ny01vol ny01vg
D.)Convert the volume to gfs2 file system
mkfs.gfs2 -p lock_dlm -t nylinux-clus1:nyata -j 8 /dev/ny01vg/ny01vol
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4.Mount the file system
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A.)Mount the gfs2 file system
mkdir -p /oracle/ny01/
mount /dev/ny01vg/ny01vol /oracle/ny01/
B.)After mounting do /etc/mtab
You should see the below mount point entries, copy the below line and update in /etc/fstab
/dev/mapper/ny01vg-ny01vol /oracle/ny01 gfs2 rw,relatime,hostdata=jid=0 0 0
C.)On ny02 node scan for newly created gfs2 file system
vgscan
lvscan
Do, df –h and you should see the newly created gfs2 file system visible.
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5.Post-Backup
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----Take various backup of all post
df -Ph > df.Ph.post
fdisk -l > fdisk.l.post
pvs > pvs.post
vgs > vgs.post
lvs > lvs.post
cat /etc/fstab >fstab.post
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