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Old 05-20-2013, 10:20 AM   #1
Registered: Feb 2012
Posts: 33

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cannot detect additional virtual disk on centos

Hi, perhaps this is somewhat a vmware ESXI question, im having trouble detecting the additional virtual hard disk that ive added on my ESXI.

I have 2 issues
1st: initially my setting was Hard Disk 1 & 2 were both 240GB. I increased both of them to 300GB hoping for the changes to be reflected on my server.

Hard Disk 1 - Virtual Disk - 300GB
Hard Disk 2 - Virtual Disk - 300GB

running df -h showed nothing was changed on my /
#df -h 
Filesystem                      Size    Used    Avail   Use%    Mounted On
/dev/mapper/vg_centos-lv_root   237G    234G       0    100%    /
mpfs                            947M    324K    947M    1%      /dev/shm
/dev/sda1                       485M     52M    408M    12%     /boot
/dev/sda1                       485M    52M     408     12%     /mnt/disk_sda1
Please clarify if changing the value directly on my virtual disk on ESXI is not the proper way of extending the storage capacity.

if yes, how could i bring it back to the original 240GB, i cant seem to decrease the value anymore.

2nd: and so i figured that maybe adding a new virtual disk to extend it on my / is the right way..

so i added another virtual disk on ESXI

Hard Disk 3 - Virtual Disk - 100GB

Linux cant seem to detect the additional 100GB on my system. can someone please read and explain the below code into human readeable format.

#fdisk -l
/dev/sda1       *       1       64      512000          83      Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64       2089    16264192        8e      Linux LVM

Disk /dev/sdb: 257.7GB  257..... bytes
255 heads, 63 sectors/trac, 31330 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size *logical/physical): 512 bytes /512 bytes
I/O size minimum/optimal): 512 bytes / 512 bytes
Diskidentifier: 0xd2d850c6

        Device Boot     Start   End     Blocks          Id      System
        /dev/sdb1       1       31330   251658193+      83      Linux

Disk /dev/mapper/vg_centos-lv_root: 257.7 GB, 25769.....bytes
255 heds, 63 sectors/track, 31329 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk Identifier: 0x0000000

Disk /dev/mapper/vg_centos-lv_swap: 4261 MB, 4261... bytes
255 heads, 63 sectors/track, 518 cylinders
Units = cylinders of 16065 * 512 = 8225280 byte
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000000000

Last edited by pedenski; 05-20-2013 at 10:22 AM.
Old 05-22-2013, 03:21 PM   #2
Registered: Mar 2008
Posts: 19,217

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This is kind of a normal issue with a VM. The VM can manipulate the resources but then you have to fix the client level. It would at first thought seem to be as if you directly replaced the 250 with 300 disk but vm's are kind of funny. They sort of act like you added more to the drive. On top of that you have a mapper. As to the correct fix there are many ways to go.

One way is to just make a full backup of the system and apply it to a new VM. Kind of a long way to go.

The other choice is to fix your client. Might start with gparted and see what it sees, fix the partition, then fix the lvm.


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