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studying for rhcsa - help with logical volume theory and extending lv size required

Hi all,
When I try to resize my partition, I keep getting the following:

Code:

open: Is a directory while opening /mnt/mymount/

These are my steps:

Code:

  1  pvcreate /dev/xvdf1

  2  vgcreate battlestar /dev/xvdf1

  3 lvcreate -L 192M -n galactica battlestar

  4  mkdir /mnt/mymount

  5  mount /dev/battlestar/galactica /mnt/mymount

  6  mkfs.ext4 /dev/battlestar/galactica

  7  mount /dev/battlestar/galactica /mnt/mymount

  8  lvextend -L +60 /dev/battlestar/galactica

  9  resize2fs /mnt/mymount/

  10 resize2fs /dev/mapper/battlestar-galactica

line 9 does not work but line 10 does. Why?
Why doesn't the size of mymount increase after line 8? Why do I need to type resize2fs

Also, could someone please verify my understanding of pv,lg,lv (diagram is found here: http://imgur.com/qVtTcrE)

At first, I partitioned xvdf (1GB).
Next, I created a physical volume, and then a volume group. This volume group may have multiple physical volumes, but at the moment, we only have 1(xvdf1). After that, I created a logical volume, essentially, carving out 200MB of memory from PV.

Once the LV is created, this "storage device" needs a filesystem. I used the mkfs.ext4 command to do this. Once this was created, I now need to mount this storage device using the mount command.

Quote:

line 9 does not work but line 10 does. Why?

Because you don't resize a mount point. You may resize a file system in a partition.

You may extend the size of a logical volume too, but this you cannot resize a mount point because mount point is merely a pointer, node or a file.

Read the manual:

Code:

man resize2fs

man lvextend

Hope that helps.

m.m.

Be sure that you clearly understand the intent and purpose of "logical volumes." The concept is simply to extend what Linux sees as "a single [logical ...] volume" across multiple "physical" storage devices, with the ability to change the physical volume layout ... as it were ... "right under Linux's nose." :)

For instance, when a drive begins to make ominous clicking noises . . . :eek:

Some things don't change: the volume, be it an LVM or a single drive, is still "mounted" at some location in the filesystem, and that mount-point is still represented by a directory.