[linux-lvm] How to resize a PV located on a SAN LUN

[Louis Guillaume]

Micha Holzmann wrote:
> Hello,
> 
> since a few weeks we have an IBM SAN environment with Blade-Center.
> The SAN controller is a DS4700 formerly known as FASTt. We have a LUN
> with 200 GB of size. The LUN ist partioned:
> 
> 
> fdisk -l /dev/sda
> 
> Disk /dev/sda: 214.7 GB, 214748364800 bytes
> 255 heads, 63 sectors/track, 26108 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *           1         125     1004031   83  Linux
> /dev/sda2             126       26108   208708447+   5  Extended
> /dev/sda5             126         188      506016   83  Linux
> /dev/sda6             189        1185     8008371   83  Linux
> /dev/sda7            1186        1435     2008093+  83  Linux
> /dev/sda8            1436        1560     1004031   83  Linux
> /dev/sda9            1561        1810     2008093+  83  Linux
> /dev/sda10           1811        2060     2008093+  83  Linux
> /dev/sda11           2061        4053    16008741   83  Linux
> /dev/sda12           4054       24960   167935446   8e  Linux LVM
> /dev/sda13          24961       26108     9221278+  82  Linux swap
> 
> 
> 
> Now i had to increase the size of partition of sda12 which is a LVM.
> I am not sure which is the right way. Within the storage managment
> software i can increase the size of the LUN. After rebooting the machine
> the additional space is appended at the end of partitions and it is
> marked as free. How can i now increase the LVM partition. Which
> tool/programm i do need for this task?
> 
> Best regards,
> Micha
> 


Others have suggested what is probably your only option if you're stuck
with this configuration, i.e. create a new PV and add it to the volume
group.

This configuration seems a little strange to me. How come you
partitioned the LUN this way? Using LVM for everything would have been
much more flexible in general.

If you had created a single PV from the whole LUN and created Logical
Volumes for each "partition", you would not have any problem now: You
would be able to simply do a "pvresize" then "lvextend" to grow the LV,
then resize2fs (assuming ext[23]).

Louis