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Old 04-24-2016, 05:01 AM   #1
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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:
open: Is a directory while opening /mnt/mymount/
These are my steps:
   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:

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.
Old 04-24-2016, 05:54 AM   #2
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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:
man resize2fs
man lvextend
Hope that helps.

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Old 04-24-2016, 09:04 AM   #3
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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 . . .

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.
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