Extending a Non-root LVM Partition on Exadata

On an Oracle Exadata Database Machine, the ‘/u01’ is defaulted to a size of 100Gb, which can easily fill up.  Luckily this is just a Logical Volume and there’s normally lots of space available on the Logical Volume Group which is usually untapped.

 

Extending ‘/u01’

Identify how much space is used and free on ‘/u01’ using df:

[root@v1ex1dbadm01 ~]# df -h /u01
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VGExaDb-LVDbOra1
99G 78G 17G 83% /u01
[root@v1ex1dbadm01 ~]#

Display the current logical volume configuration using the lvs command:

[root@v1ex1dbadm01 ~]# lvs -o lv_name,lv_path,vg_name,lv_size
LV Path VG LSize
LVDbOra1 /dev/VGExaDb/LVDbOra1 VGExaDb 100.00g
LVDbSwap1 /dev/VGExaDb/LVDbSwap1 VGExaDb 24.00g
LVDbSys1 /dev/VGExaDb/LVDbSys1 VGExaDb 30.00g
LVDbSys2 /dev/VGExaDb/LVDbSys2 VGExaDb 30.00g
LVDoNotRemoveOrUse /dev/VGExaDb/LVDoNotRemoveOrUse VGExaDb 1.00g
[root@v1ex1dbadm01 ~]#

Check the online resize option is available using the tune2fs command:

[root@v1ex1dbadm01 ~]# tune2fs -l /dev/VGExaDb/LVDbOra1 | grep resize_inode
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
[root@v1ex1dbadm01 ~]#

If not available then the file system needs to be unmounted before resizing.  Refer to documentation:

Extending a Non-root LVM Partition on Systems Running Oracle Exadata Storage Server Software Earlier than Release 11.2.3.2.1

Verify there’s space available in the Logical Volume Group using vgdisplay command:

[root@v1ex1dbadm01 ~]# vgdisplay -s
"VGExaDb" 1.63 TiB [185.00 GiB used / 1.45 TiB free]
[root@v1ex1dbadm01 ~]#

Finally if there’s enough space, then extend the Logical Volume using lvextend command:

[root@v1ex1dbadm01 ~]# lvextend -L +100G /dev/VGExaDb/LVDbOra1
Size of logical volume VGExaDb/LVDbOra1 changed from 100.00 GiB (25600 extents) to 200.00 GiB (51200 extents).
Logical volume LVDbOra1 successfully resized.
[root@v1ex1dbadm01 ~]#

Followed by a resize of the file system using resize2fs command:

[root@v1ex1dbadm01 ~]# resize2fs /dev/VGExaDb/LVDbOra1
resize2fs 1.43-WIP (20-Jun-2013)
Filesystem at /dev/VGExaDb/LVDbOra1 is mounted on /u01; on-line resizing required
old_desc_blocks = 7, new_desc_blocks = 13
Performing an on-line resize of /dev/VGExaDb/LVDbOra1 to 52428800 (4k) blocks.
The filesystem on /dev/VGExaDb/LVDbOra1 is now 52428800 blocks long.
[root@v1ex1dbadm01 ~]#

You should now see ‘/u01’ with additional 100Gb less formatting:

[root@v1ex1dbadm01 ~]# df -h /u01
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VGExaDb-LVDbOra1
197G 78G 110G 42% /u01
[root@v1ex1dbadm01 ~]#

Also see the Logical Volume is now 200Gb from 100Gb:

[root@v1ex1dbadm01 ~]# lvs -o lv_name,lv_path,vg_name,lv_size
LV Path VG LSize
LVDbOra1 /dev/VGExaDb/LVDbOra1 VGExaDb 200.00g
LVDbSwap1 /dev/VGExaDb/LVDbSwap1 VGExaDb 24.00g
LVDbSys1 /dev/VGExaDb/LVDbSys1 VGExaDb 30.00g
LVDbSys2 /dev/VGExaDb/LVDbSys2 VGExaDb 30.00g
LVDoNotRemoveOrUse /dev/VGExaDb/LVDoNotRemoveOrUse VGExaDb 1.00g
[root@v1ex1dbadm01 ~]#

 

Documentation for reference:

Extending a Non-root LVM Partition on Systems Running Oracle Exadata Storage Server Software Release 11.2.3.2.1 or Later

 

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Thanks

Zed DBA (Zahid Anwar)

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