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Operating Systems Linux Red Hat Extending swap space
# 1  
Old 06-02-2015
Extending swap space
I've to install Oracle binaries (I'm oracle DBA) and for that I've extend swap space in my home computer. My situation is like this.

Code:
[root@rac1 ~]# parted -s /dev/sda print free
Model: ATA VBOX HARDDISK (scsi)
Disk /dev/sda: 38.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
        32.3kB  1049kB  1016kB           Free Space
 1      1049kB  525MB   524MB   primary  ext4         boot
 2      525MB   21.5GB  20.9GB  primary               lvm
        21.5GB  21.5GB  1370kB           Free Space
 3      21.5GB  24.7GB  3216MB  primary
 4      24.7GB  32.2GB  7518MB  primary
        32.2GB  38.7GB  6445MB           Free Space

[root@rac1 ~]# pvs /dev/sda
  Failed to read physical volume "/dev/sda"
[root@rac1 ~]# pvs
  PV         VG      Fmt  Attr PSize  PFree
  /dev/sda2  vg_rac1 lvm2 a--  19.51g     0
  /dev/sda3  vg_rac1 lvm2 a--   2.99g     0
  /dev/sda4  vg_rac1 lvm2 a--   7.00g 92.00m

[root@rac1 ~]# vgs
  VG      #PV #LV #SN Attr   VSize  VFree
  vg_rac1   3   2   0 wz--n- 29.50g 92.00m
[root@rac1 ~]# pvs
  PV         VG      Fmt  Attr PSize  PFree
  /dev/sda2  vg_rac1 lvm2 a--  19.51g     0
  /dev/sda3  vg_rac1 lvm2 a--   2.99g     0
  /dev/sda4  vg_rac1 lvm2 a--   7.00g 92.00m
[root@rac1 ~]# lvs
  LV      VG      Attr      LSize  Pool Origin Data%  Move Log Cpy%Sync Convert
  lv_root vg_rac1 -wi-ao--- 27.75g
  lv_swap vg_rac1 -wi-ao---  1.66g
[root@rac1 ~]#

[root@rac1 ~]# vgdisplay
  --- Volume group ---
  VG Name               vg_rac1
  System ID
  Format                lvm2
  Metadata Areas        3
  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                3
  Act PV                3
  VG Size               29.50 GiB
  PE Size               4.00 MiB
  Total PE              7552
  Alloc PE / Size       7529 / 29.41 GiB
  Free  PE / Size       23 / 92.00 MiB
  VG UUID               bXwPby-NHXU-enXI-xPyd-PA36-GhoU-9OR76p

[root@rac1 ~]#
[root@rac1 ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/vg_rac1/lv_root
  LV Name                lv_root
  VG Name                vg_rac1
  LV UUID                zMH9da-7isj-DNmd-cDM2-SCE3-HDA3-Xye4bo
  LV Write Access        read/write
  LV Creation host, time rac1.localdomain, 2015-05-27 16:20:24 -0400
  LV Status              available
  # open                 1
  LV Size                27.75 GiB
  Current LE             7104
  Segments               3
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0

  --- Logical volume ---
  LV Path                /dev/vg_rac1/lv_swap
  LV Name                lv_swap
  VG Name                vg_rac1
  LV UUID                8NRkpq-A2l4-qdia-YCdM-ZWkX-6Ase-N7wTex
  LV Write Access        read/write
  LV Creation host, time rac1.localdomain, 2015-05-27 16:20:28 -0400
  LV Status              available
  # open                 2
  LV Size                1.66 GiB
  Current LE             425
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1

[root@rac1 ~]#


As you can see above that 6445MB is free above and I want to take 4 GB out of that to extend the swap space.

I tried this command but failed. Can you suggest please how to extend the space? Please let me know if you need more info.

Code:
[root@rac1 ~]# lvresize /dev/vg_rac1/lv_swap -L +4G
  Extending logical volume lv_swap to 5.66 GiB
  Insufficient free space: 1024 extents needed, but only 23 available
[root@rac1 ~]#

Thanks
Last edited by rbatte1; 06-02-2015 at 12:10 PM.. Reason: Added CODE tags
# 2  
Old 06-02-2015
I would suggest that there is Insufficient free space as your error message (which should all be in CODE tags to make it clear) tells you.

Did you look at where you are trying to increase the swap space?



Robin
# 3  
Old 06-02-2015
What do I need to modify to increase the swap? I don't want to rebuild this virtual machine since I've grid infrastructure already working fine.

Thanks
# 4  
Old 06-02-2015
Your free (unallocated) disk space on the server for this volume group (not sure if there are any more) is shown in this line:-
Code:
  Free  PE / Size       23 / 92.00 MiB

You cannot extend the logical volume by added space that you do not have.

Can you assign more disk to the server, e.g. another LUN or VM disk?

If so, then you can increase the volume group by adding in the new LUN and try your lvresize again.



Robin
# 5  
Old 06-02-2015
if you see below you can see that I've added 6445 MB space to the disk and it is unallocated. How can I use / assign this space?

Code:
[root@rac1 ~]# parted -s /dev/sda print free
Model: ATA VBOX HARDDISK (scsi)
Disk /dev/sda: 38.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
        32.3kB  1049kB  1016kB           Free Space
 1      1049kB  525MB   524MB   primary  ext4         boot
 2      525MB   21.5GB  20.9GB  primary               lvm
        21.5GB  21.5GB  1370kB           Free Space
 3      21.5GB  24.7GB  3216MB  primary
 4      24.7GB  32.2GB  7518MB  primary
        32.2GB  38.7GB  6445MB           Free Space

# 6  
Old 06-02-2015
How did you assign slice 2 to LVM? Was it a choice in the install process or did you manually define it? If it is the latter, then you have the same steps to perform,except that you extend the volume group rather than create it.

You might get away with:-
Code:
pvcreate /dev/sda4
vgextend vg_rac1 /dev/sda4
lvresize ..........


I hope that this helps,
Robin
# 7  
Old 06-02-2015
I added about 7 GB to my VM from the host machine using the following command on host

Code:
vboxmanage modifyhd --resize <the_size_mb>

After that I used the "disk tool" shortcut from linux console to create /dev/sd4.
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