Out of Space - Ubuntu Linux 14.04

handsofqwerty

Once you have pvcreated, use vgextend to add the new block device to your existing VG.

Look up the details with vgs

This is what I got.

root@plex-server:~# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created
  
root@plex-server:~# vgs
  VG             #PV #LV #SN Attr   VSize  VFree
  plex-server-vg   1   2   0 wz--n- 19.76g 20.00m

handsofqwerty

So basically, now what?

scottalanmiller

I think.....

vgextend plex-server-vg /dev/sdb

handsofqwerty

@scottalanmiller said:

I think.....

vgextend plex-server-vg /dev/sdb

Do I need to reboot?

handsofqwerty

@scottalanmiller said:

I think.....

vgextend plex-server-vg /dev/sdb

root@plex-server:~# vgextend plex-server-vg /dev/sdb
  Volume group "plex-server-vg" successfully extended

handsofqwerty

I was able to tab complete the plex-server-vg after typing vgextend, so I'm pretty sure that's right.

handsofqwerty

This is what I have currently...

root@plex-server:~# vgs
  VG             #PV #LV #SN Attr   VSize  VFree
  plex-server-vg   2   2   0 wz--n- 44.75g 25.02g
root@plex-server:~# df -h
Filesystem                           Size  Used Avail Use% Mounted on
/dev/mapper/plex--server--vg-root     18G   17G  332K 100% /
none                                 4.0K     0  4.0K   0% /sys/fs/cgroup
udev                                 2.0G  4.0K  2.0G   1% /dev
tmpfs                                396M  712K  395M   1% /run
none                                 5.0M     0  5.0M   0% /run/lock
none                                 2.0G  4.0K  2.0G   1% /run/shm
none                                 100M     0  100M   0% /run/user
/dev/sda1                            236M   55M  169M  25% /boot
overflow                             1.0M   16K 1008K   2% /tmp

scottalanmiller

So you can see that you now have 25GB free.

scottalanmiller

Now you need to lvextend to 100%free

I'm on a plane. You will need to Google the syntax.

handsofqwerty

Ok, I was able to figure it out. Here is the final results:

What I used to get info:

root@plex-server:/dev# lvs
  LV     VG             Attr      LSize  Pool Origin Data%  Move Log Copy%  Convert
  root   plex-server-vg -wi-ao--- 17.74g
  swap_1 plex-server-vg -wi-ao---  2.00g

root@plex-server:/dev# vgs
  VG             #PV #LV #SN Attr   VSize  VFree
  plex-server-vg   2   2   0 wz--n- 44.75g 25.02g

The command I ran to extend the logical volume and the file system together and the results:

root@plex-server:/dev# lvextend -r plex-server-vg/root /dev/sdb
  Extending logical volume root to 42.74 GiB
  Logical volume root successfully resized
resize2fs 1.42.9 (4-Feb-2014)
Filesystem at /dev/mapper/plex--server--vg-root is mounted on /; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 3
The filesystem on /dev/mapper/plex--server--vg-root is now 11203584 blocks long.

root@plex-server:/dev# df -h
Filesystem                           Size  Used Avail Use% Mounted on
/dev/mapper/plex--server--vg-root     42G   17G   24G  42% /
none                                 4.0K     0  4.0K   0% /sys/fs/cgroup
udev                                 2.0G  4.0K  2.0G   1% /dev
tmpfs                                396M  716K  395M   1% /run
none                                 5.0M     0  5.0M   0% /run/lock
none                                 2.0G  4.0K  2.0G   1% /run/shm
none                                 100M     0  100M   0% /run/user
/dev/sda1                            236M   55M  169M  25% /boot
overflow                             1.0M   16K 1008K   2% /tmp

Thanks so much for your help and guidance @scottalanmiller ! I learned a lot today!

handsofqwerty

Now, @scottalanmiller, one more question...the new virtual HDD is thin provisioned, so if I needed to expand it further, I can do it easily. Would I have to run lvextend again if I expand that drive in VMware? I assume so but are just curious. Thanks!

scottalanmiller

@handsofqwerty said:

Now, @scottalanmiller, one more question...the new virtual HDD is thin provisioned, so if I needed to expand it further, I can do it easily. Would I have to run lvextend again if I expand that drive in VMware? I assume so but are just curious. Thanks!

Yes, expanding or growing underlying block storage will not make volume managers or file systems on top grow too. The system has no way to know how you want the new storage to be used, so you would not want this. What if you wanted to add a new filesystem, for example, you would take the same action but would be pretty surprised if you found that that was automatically added to an already existing filesystem.

In a case like yours, it feels like the layers of expansion are obvious and you would "just want that." BUt if you were doing other tasks with the storage you would be like "oh, yeah, it can't make that judgement call for me."

handsofqwerty

@scottalanmiller said:

@handsofqwerty said:

Now, @scottalanmiller, one more question...the new virtual HDD is thin provisioned, so if I needed to expand it further, I can do it easily. Would I have to run lvextend again if I expand that drive in VMware? I assume so but are just curious. Thanks!

Yes, expanding or growing underlying block storage will not make volume managers or file systems on top grow too. The system has no way to know how you want the new storage to be used, so you would not want this. What if you wanted to add a new filesystem, for example, you would take the same action but would be pretty surprised if you found that that was automatically added to an already existing filesystem.

In a case like yours, it feels like the layers of expansion are obvious and you would "just want that." BUt if you were doing other tasks with the storage you would be like "oh, yeah, it can't make that judgement call for me."

I totally understand. It's easy to think about use cases only from one perspective, so I know what you mean. I figured that was the case but wanted to double check. So I should be able to, in theory, issue the same command, right?

scottalanmiller

Yup, you just do the same process again to expand in the future.

handsofqwerty

@scottalanmiller said:

Yup, you just do the same process again to expand in the future.

Sweet, thanks!