Creating A New File System on Exadata Compute Node

When the Exadata Database Machine is installed by Oracle ACS, you will see the following default file system created:

• /
• /dev/shm
• /boot
• /u01

There is a plenty of space available in the volume group and this can be used to increase the existing
file system size or you can create a new file system.


In this article we will demonstrate how to create a new file system (named /u02) on Exadata Compute
node.

• Connect to the compute node as root user

login as: rootroot@dm01db01's password:
Last login: Mon Nov 19 13:11:39 2018 from 10.xx.xxx.xxx

• List the exisint file system on Exadata Compute node

[root@dm01db01 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VGExaDb-LVDbSys1
                       59G   38G   19G  67% /
tmpfs                 252G  6.0M  252G   1% /dev/shm
/dev/sda1             480M   63M  393M  14% /boot
/dev/mapper/VGExaDb-LVDbOra1
                      197G   97G   91G  52% /u01

• Get the free space available in the volume group

[root@dm01db01 ~]# vgdisplay | grep Free
  Free  PE / Size       337428 / 1.29 TiB

• List the physical volumes and logical volumes

[root@dm01db01 ~]# pvs
 PV         VG      Fmt  Attr PSize   PFree
  /dev/sda2  VGExaDb lvm2 a--u 557.36g 202.36g
  /dev/sda3  VGExaDb lvm2 a--u   1.09t   1.09t

[root@dm01db01 ~]# lvs
  LV                 VG      Attr       LSize   Pool Origin   Data%  Meta%  Move Log Cpy%Sync Convert
  LVDbOra1           VGExaDb owi-aos--- 200.00g
  LVDbSwap1          VGExaDb -wi-ao----  24.00g
  LVDbSys1           VGExaDb owi-aos---  60.00g
  LVDbSys2           VGExaDb -wi-a-----  60.00g
  LVDoNotRemoveOrUse VGExaDb -wi-a-----   1.00g
  root_snap          VGExaDb swi-I-s---   5.00g      LVDbSys1 100.00
  u01_snap           VGExaDb swi-I-s---   5.00g      LVDbOra1 100.00

• Create a new logical volume of your desired size. Here we are creating a logical volume of 100GB size

[root@dm01db01 ~]# lvcreate -L100GB -n LVDbOra2 VGExaDb
  Logical volume "LVDbOra2" created.

• List the logical volumes and ensure our new logical volume is displayed

[root@dm01db01 ~]# lvs
  LV                 VG      Attr       LSize   Pool Origin   Data%  Meta%  Move Log Cpy%Sync Convert
  LVDbOra1           VGExaDb owi-aos--- 200.00g
  LVDbOra2           VGExaDb -wi-a----- 100.00g
  LVDbSwap1          VGExaDb -wi-ao----  24.00g
  LVDbSys1           VGExaDb owi-aos---  60.00g
  LVDbSys2           VGExaDb -wi-a-----  60.00g
  LVDoNotRemoveOrUse VGExaDb -wi-a-----   1.00g
  root_snap          VGExaDb swi-I-s---   5.00g      LVDbSys1 100.00
  u01_snap           VGExaDb swi-I-s---   5.00g      LVDbOra1 100.00

• Now create the new file system as shown below

[root@dm01db01 ~]# mkfs.ext3 -j -L u02 /dev/VGExaDb/LVDbOra2
mke2fs 1.43-WIP (20-Jun-2013)
Filesystem label=u02
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
6553600 inodes, 26214400 blocks
1310720 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
800 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

• Mount the new file system

[root@dm01db01 ~]# mkdir /u02

[root@dm01db01 ~]# mount -t ext3 /dev/VGExaDb/LVDbOra2 /u02

• Verify that the new file system is mounted and accessible

[root@dm01db01 ~]# df -kh
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VGExaDb-LVDbSys1
                       59G   38G   19G  67% /
tmpfs                 252G  6.0M  252G   1% /dev/shm
/dev/sda1             480M   63M  393M  14% /boot
/dev/mapper/VGExaDb-LVDbOra1
                      197G   97G   91G  52% /u01
/dev/mapper/VGExaDb-LVDbOra2
                       99G   60M   94G   1% /u02


Conclusion
In this article we have learned how to create a new file system on Exadata Compute node using the free space available in the volume group.