🌀 7.1: Elasticity Task
🔅Integrating LVM with Hadoop and providing Elasticity to DataNode Storage
first we make hadoop cluster storage elastic means we can increase the storage in the datanode on run time by using the concept of lvm
first we start the services of name node and data node and lets see how much storage does data node give .
as we see how much storage data node give to name node.
now our next step is to increase the storage of data node so that it give more storage to name node .
so for doing this we add two more virtual harddisks in the data node .
our present harddisk to data node is this much
now we add two more virtual harddisks to the node the help of data node
we do add or not for this we check by using this command
we successfully connected two harddisks
/dev/sdc of 20 gib
/dev/sdd of 20 gib
now our next step is create physical volume of both disks
by using these command
pv created successfully
we can also confirm by the command
our next step is create volume group with the help of these pv’s
with the help of this command
vgcreate vg_name /dev/sdc /dev/sdd
volume group created successfully
now we create logical volume with the help of volume group
by using lvcreate command
we successfully created lv of 20 gib
now our next step is to format the lv and mount to the /dn folder in the datanode
now let’s check whether storage of our cluster is increased or not
now do extend more the lv from vg
in vg we have 20 gib is free because in we have in vg is 40 gib and we give 20 gib to lv so almost 20 gib is free
now we check again the storage of cluster increased or not .
yes storage of cluster increased .
and our task is also done .