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Disk resize with parted in Centos 5.5 (Virtual Machines)


Steps to Increase Disk Size with Parted with Sectors as an unit (Recommended on Virtual Machines)

See the Next Article to find steps to increase space on physical Disk

Below are the steps which should be followed to perform disk increase.

First increase the VMDK size on Virtual Machine then follow the below steps, In My case here , I am extending +90GB more and increasing the same @ OS level adding to /var partition.

Here we are starting to increase the partition size with parted Tools ( BE CAUTIOUS, CHANGES TAKES PLACE IMMEDIATELY)

Please take a look at this page too https://centostricks.wordpress.com/2012/05/01/disk-resize-steps-when-we-see-partitions-as-a-separate-disk-in-fdisk/

[root@personal ~]# parted /dev/sda

GNU Parted 1.8.1

Using /dev/sda

Welcome to GNU Parted! Type ‘help’ to view a list of commands.

(parted) print

Model: VMware Virtual disk (scsi)

Disk /dev/sda: 177GB

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags

1      32.8kB  107MB   107MB   primary  ext3

2      107MB   80.5GB  80.4GB  primary               lvm

(parted) u s                                                        ( Changing the Default Unit to Sectors)

(parted) print

Model: VMware Virtual disk (scsi)

Disk /dev/sda: 346030079s

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Number  Start    End         Size        Type     File system  Flags

1      64s      208895s     208832s     primary  ext3

2      208896s  157276349s  157067454s  primary               lvm

(parted) rm 2                                     ( Here we are deleting the partition and recreating with new size, In this we are requested to increase the second partition to the new size. So we are deleting it first)

(parted) print

Model: VMware Virtual disk (scsi)

Disk /dev/sda: 346030079s

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Number  Start  End         Size          Type       File system  Flags

1                64s    208895s 208832s  primary  ext3

(parted) mkpart primary 208896s 346030079s      ( Here we are recreating the second partition which was deleted in the previous step, We are passing the Partition type, Starting sector(Starting sector will be next sector of the last partition i.e., if the sector of last partition ends at  208895s and the starting sector of the new partition should be 208896s) and ending sector. Here the Ending sector is the max sectors available on this respective disk which can found from line Disk in the print command, changed to color )

(parted) print

Model: VMware Virtual disk (scsi)

Disk /dev/sda: 346030079s

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Number  Start    End         Size        Type     File system  Flags

1      64s      208895s     208832s     primary  ext3

2      208896s  346030079s  345821184s  primary

(parted) toggle 2 lvm                                     ( This commands set this partition to be of LVM Type)

(parted) print

Model: VMware Virtual disk (scsi)

Disk /dev/sda: 346030079s

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Number  Start    End         Size        Type     File system  Flags

1      64s      208895s     208832s     primary  ext3

2      208896s  346030079s  345821184s  primary               lvm

(parted) quit                                              ( Exit from Parted)

Information: Don’t forget to update /etc/fstab, if necessary.

[root@personal ~]# fdisk -l

Disk /dev/sda: 177.1 GB, 177167400960 bytes

255 heads, 63 sectors/track, 21539 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System

/dev/sda1               1          14      104416   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2              14       21540   172910592   8e  Linux LVM

[root@personal ~]# echo 1 > /sys/block/sda/device/rescan   ( To rescan the changes done on block device)

[root@personal ~]#

[root@personal ~]# reboot    ( To make changes take effect)

[root@personal ~]# fdisk -l

Disk /dev/sda: 177.1 GB, 177167400960 bytes

255 heads, 63 sectors/track, 21539 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System

/dev/sda1               1          14      104416   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2              14       21540   172910592   8e  Linux LVM

[root@personal ~]# pvscan

PV /dev/sda2   VG VG_00   lvm2 [74.88 GB / 0    free]

Total: 1 [74.88 GB] / in use: 1 [74.88 GB] / in no VG: 0 [0   ]

[root@personal ~]# pvresize /dev/sda2   ( Increase the Physical Volume. Prior to this step we need to reboot the OS)

Physical volume “/dev/sda2” changed

1 physical volume(s) resized / 0 physical volume(s) not resized

[root@personal ~]# pvscan

PV /dev/sda2   VG VG_00   lvm2 [164.88 GB / 90.00 GB free]

Total: 1 [164.88 GB] / in use: 1 [164.88 GB] / in no VG: 0 [0   ]

[root@personal ~]# vgscan

Reading all physical volumes.  This may take a while…

Found volume group “VG_00” using metadata type lvm2

[root@personal ~]# vgdisplay “VG_00”

— Volume group —

VG Name               VG_00

System ID

Format                lvm2

Metadata Areas        1

Metadata Sequence No  20

VG Access             read/write

VG Status             resizable

MAXLV                0

CurLV                5

OpenLV               5

Max PV                0

Cur PV                1

Act PV                1

VG Size               164.88 GB

PE Size               32.00 MB

Total PE              5276

AllocPE/ Size       2396 / 74.88 GB

  Free  PE / Size       2880 / 90.00 GB

VG UUID               KWCu75-D0E1-lmAm-AAiq-t6vA-ISuh-93ISaF

[root@personal ~]# lvscan

ACTIVE            ‘/dev/VG_00/LV_root’ [10.00 GB] inherit

ACTIVE            ‘/dev/VG_00/LV_opt’ [28.03 GB] inherit

ACTIVE            ‘/dev/VG_00/LV_tmp’ [2.00 GB] inherit

ACTIVE            ‘/dev/VG_00/LV_var’ [29.03 GB] inherit

ACTIVE            ‘/dev/VG_00/LV_swap’ [5.81 GB] inherit

[root@personal ~]# lvextend -l +100%FREE /dev/VG_00/LV_var    (Extend the requested partition with the new size. In this case it is /var)

Extending logical volume LV_var to 119.03 GB

Logical volume LV_var successfully resized

[root@personal ~]#

[root@personal ~]#

[root@personal ~]# lvscan

ACTIVE            ‘/dev/VG_00/LV_root’ [10.00 GB] inherit

ACTIVE            ‘/dev/VG_00/LV_opt’ [28.03 GB] inherit

ACTIVE            ‘/dev/VG_00/LV_tmp’ [2.00 GB] inherit

ACTIVE            ‘/dev/VG_00/LV_var’ [119.03 GB] inherit

ACTIVE            ‘/dev/VG_00/LV_swap’ [5.81 GB] inherit

[root@personal ~]# resize2fs /dev/VG_00/LV_var          (Resize the filesystem)

resize2fs 1.39 (29-May-2006)

Filesystem at /dev/VG_00/LV_var is mounted on /var; on-line resizing required

Performing an on-line resize of /dev/VG_00/LV_var to 31203328 (4k) blocks.

The filesystem on /dev/VG_00/LV_var is now 31203328 blocks long.

[root@personal ~]#

[root@personal ~]#

[root@personal ~]#

[root@personal ~]# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VG_00-LV_root

9.7G  3.6G  5.7G  39% /

/dev/mapper/VG_00-LV_opt

28G 1008M   25G   4% /opt

/dev/mapper/VG_00-LV_tmp

2.0G  418M  1.5G  23% /tmp

/dev/mapper/VG_00-LV_var

116G   23G   88G  21% /var

/dev/sda1              99M   26M   69M  28% /boot

tmpfs                 2.0G     0  2.0G   0% /dev/shm

You should be ALL SET🙂

Somecases, you need to extend the Extended partition to allocate space to Logical Partition, In that case, you need to resize the extended partition and then resize the logical partition

Please follow the below steps to resize the extended partition whose partition number is 4

# resize 4 <start sector> <end sector>  (End sector will the last sector of the Harddisk which is seen in Disk line of parted tool)

Now all other steps you followed the recreate the primary partition has to be applied on the last available logical partition in parted. thanks

3 responses to “Disk resize with parted in Centos 5.5 (Virtual Machines)

  1. Banash May 21, 2012 at 5:17 pm

    Thank you wary much. U saved me at least day🙂

  2. Alex Rumyankov July 5, 2012 at 11:03 am

    Thanks a lot! Added to bookmark.

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