LVM Partition
-------------------------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/n/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.
--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/n/powermt.post
- powermt config
- powermt save
--E.)check the difference between pre & post for fdisk & powermt
- cd /home/n/
- 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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