#file-system

[prehensile]

via Pinboard

[prehensile]

via Pinboard

[techtrace-blog]

Increasing a Linux Logical volume and file system

LVM is a logical Volume manager for the Liner Kernel; it manages disk drives and similar mass-storage devices.

A number of tools are provided for configuring LVM volumes and volume groups on most linux distributions. The first step is to gather information on file-system that we want to increase.

Use df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/vg_talhafedoravbox-lv_root

                           76G   16G   60G  21% /

tmpfs                  625M  8.2M  616M   2% /dev/shm

/dev/sda1             485M   49M  411M  11% /boot

Now lets say we want to increase the root filesystem on Volume Group vg_talhafedorabox. Then we need to figure out whether we have enough space available in that volume group.

Use

vgdisplay

 --- Volume group ---

  VG Name               vg_talhafedoravbox

  System ID             

  Format                lvm2

  Metadata Areas        2

  Metadata Sequence No  7

  VG Access             read/write

  VG Status             resizable

  MAX LV                0

  Cur LV                2

  Open LV               2

  Max PV                0

  Cur PV                2

  Act PV                2

  VG Size               79.47 GiB

  PE Size               32.00 MiB

  Total PE              2543

  Alloc PE / Size       2528 / 79.00 GiB

  Free  PE / Size       15 / 480.00 MiB

  VG UUID               SfbvVi-9mbU-c9zH-qNlO-mKpu-dY95-kqMEr0

The "Free PE/Size" shows the free space available to us in this volume group

Now to resize the vg,

Use

lvresize -L +480M /dev/mapper/vg_talhafedoravbox-lv_root

This command adjusts the size of the specified logical volume. Keep in mind, however, that this change is much like a change to a partition alone. That is, the size of the file system contained in the logical volume is not altered. To adjust the file system, you must use a file system-specific tool, such as resize2fs, resizereiserfs, xfs_growfs, or the resize mount option when mounting Journaled File System (JFS).

For ext2/ext3/ext3 systems Use

resize2fs -p  /dev/mapper/vg_talhafedoravbox-lv_root

You can now check with df -h to confirm the new file-system size

[odis]

IDEA: application and file-system

It would be wonderful if the project design could follow its logic according to file-system architecture where it is placed.

Creating a virtual file-system could be a nice solution for this. For example, if you define some namespace inside your application this namespace could be reflected in the real (id est, virtual) file-system during compilation/interpretation of source code. The same would happen with all the objects within the realm.