resize2fs Bad magic number in super-block while trying to open

Question

I am trying to resize a logical volume on CentOS7 but am running into the following error   resize2fs 1 42 9  28-Dec-2013  resize2fs  Bad magic number in super-block while trying to open  dev mapper centos-root Couldn t find valid filesystem superblock    I have tried adding a new partition  using fdisk  and using vgextend to extend the volume group  then resizing  Resize worked fine for the logical volume using lvextend  but it failed at resize2fs   I have also tried deleting an existing partition  using fdisk  and recreating it with a larger end block  then resizing the physical volume using lvm pvresize  followed by a resize of the logical volume using lvm lvresize  Again everything worked fine up to this point   Once I tried to use resize2fs  using both methods as above  I received the exact same error   Hopefully some of the following will shed some light   fdisk -l   root server    fdisk -l  Disk  dev xvda  32 2 GB  32212254720 bytes  62914560 sectors Units   sectors of 1   512   512 bytes Sector size  logical physical   512 bytes   512 bytes I O size  minimum optimal   512 bytes   512 bytes Disk label type  dos Disk identifier  0x0009323a  Device Boot      Start         End      Blocks   Id  System  dev xvda1            2048     1026047      512000   83  Linux  dev xvda2         1026048    41943039    20458496   8e  Linux LVM  dev xvda3        41943040    62914559    10485760   8e  Linux LVM  Disk  dev mapper centos-swap  2147 MB  2147483648 bytes  4194304 sectors Units   sectors of 1   512   512 bytes Sector size  logical physical   512 bytes   512 bytes I O size  minimum optimal   512 bytes   512 bytes   Disk  dev mapper centos-root  29 5 GB  29532094464 bytes  57679872 sectors Units   sectors of 1   512   512 bytes Sector size  logical physical   512 bytes   512 bytes I O size  minimum optimal   512 bytes   512 bytes   pvdisplay   root server     pvdisplay --- Physical volume --- PV Name                dev xvda2 VG Name               centos PV Size               19 51 GiB   not usable 2 00 MiB Allocatable           yes  but full  PE Size               4 00 MiB Total PE              4994 Free PE               0 Allocated PE          4994 PV UUID               7bJOPh-OUK0-dGAs-2yqL-CAsV-TZeL-HfYzCt  --- Physical volume --- PV Name                dev xvda3 VG Name               centos PV Size               10 00 GiB   not usable 4 00 MiB Allocatable           yes  but full  PE Size               4 00 MiB Total PE              2559 Free PE               0 Allocated PE          2559 PV UUID               p0IClg-5mrh-5WlL-eJ1v-t6Tm-flVJ-gsJOK6   vgdisplay   root server     vgdisplay --- Volume group --- VG Name               centos System ID Format                lvm2 Metadata Areas        2 Metadata Sequence No  6 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               29 50 GiB PE Size               4 00 MiB Total PE              7553 Alloc PE   Size       7553   29 50 GiB Free  PE   Size       0   0 VG UUID               FD7k1M-koJt-2veW-sizL-Srsq-Y6zt-GcCfz6   lvdisplay   root server     lvdisplay --- Logical volume --- LV Path                 dev centos swap LV Name                swap VG Name                centos LV UUID                KyokrR-NGsp-6jVA-P92S-QE3X-hvdp-WAeACd LV Write Access        read write LV Creation host  time localhost  2014-10-09 08 28 42  0100 LV Status              available   open                 2 LV Size                2 00 GiB Current LE             512 Segments               1 Allocation             inherit Read ahead sectors     auto - currently set to     8192 Block device           253 0  --- Logical volume --- LV Path                 dev centos root LV Name                root VG Name                centos LV UUID                ugCOcT-sTDK-M8EV-3InM-hjIg-2nwS-KeAOnq LV Write Access        read write LV Creation host  time localhost  2014-10-09 08 28 42  0100 LV Status              available   open                 1 LV Size                27 50 GiB Current LE             7041 Segments               2 Allocation             inherit Read ahead sectors     auto - currently set to     8192 Block device           253 1   I ve probably done something stupid  so any help would be greatly appreciated

User · Answer

I ran into the same exact problem around noon today and finally found a solution here --> Trying to resize2fs EB volume fails

I skipped mounting, since the partition was already mounted.

Apparently CentOS 7 uses XFS as the default file system and as a result resize2fs will fail.

I took a look in /etc/fstab, and guess what, XFS was staring me in the face... Hope this helps.

User · Answer

After reading about LVM and being familiar with PV -  VG -  LV  this works for me    0   df -h  Filesystem               Size  Used Avail Use  Mounted on devtmpfs                 1 9G     0  1 9G   0   dev tmpfs                    1 9G     0  1 9G   0   dev shm tmpfs                    1 9G  824K  1 9G   1   run tmpfs                    1 9G     0  1 9G   0   sys fs cgroup  dev mapper fedora-root   15G  2 1G   13G  14    tmpfs                    1 9G     0  1 9G   0   tmp  dev md126p1             976M  119M  790M  14   boot tmpfs                    388M     0  388M   0   run user 0   1    vgs    VG      PV  LV  SN Attr   VSize   VFree      fedora   1   2   0 wz--n- 231 88g 212 96g   2    vgdisplay    --- Volume group ---   VG Name               fedora   System ID   Format                lvm2   Metadata Areas        1   Metadata Sequence No  3   VG Access             read write   VG Status             resizable   MAX LV                0   Cur LV                2   Open LV               2   Max PV                0   Cur PV                1   Act PV                1   VG Size               231 88 GiB   PE Size               4 00 MiB   Total PE              59361   Alloc PE   Size       4844   18 92 GiB   Free  PE   Size       54517   212 96 GiB   VG UUID               9htamV-DveQ-Jiht-Yfth-OZp7-XUDC-tWh5Lv   3    lvextend -l  100 FREE   dev mapper fedora-root    Size of logical volume fedora root changed from 15 00 GiB  3840 extents  to 227 96 GiB  58357 extents     Logical volume fedora root successfully resized    4   lvdisplay  5   fd -h  6    xfs growfs  dev mapper fedora-root  meta-data  dev mapper fedora-root isize 512    agcount 4  agsize 983040 blks                                  sectsz 512   attr 2  projid32bit 1                                  crc 1        finobt 1 spinodes 0 rmapbt 0                                  reflink 0 data                             bsize 4096   blocks 3932160  imaxpct 25                                  sunit 0      swidth 0 blks naming    version 2              bsize 4096   ascii-ci 0 ftype 1 log       internal               bsize 4096   blocks 2560  version 2                                  sectsz 512   sunit 0 blks  lazy-count 1 realtime  none                   extsz 4096   blocks 0  rtextents 0 data blocks changed from 3932160 to 59757568   7   df -h  Filesystem               Size  Used Avail Use  Mounted on devtmpfs                 1 9G     0  1 9G   0   dev tmpfs                    1 9G     0  1 9G   0   dev shm tmpfs                    1 9G  828K  1 9G   1   run tmpfs                    1 9G     0  1 9G   0   sys fs cgroup  dev mapper fedora-root  228G  2 3G  226G   2    tmpfs                    1 9G     0  1 9G   0   tmp  dev md126p1             976M  119M  790M  14   boot tmpfs                    388M     0  388M   0   run user 0   Best Regards

User · Answer

In Centos 7  default filesystem is xfs   xfs file system support only extend not reduce  So if you want to resize the  filesystem use  xfs growfs rather than resize2fs   xfs growfs  dev root vg root    Note  For ext4 filesystem use  resize2fs  dev root vg root

User · Answer

os  rhel7  After gparted    xfs growfs  dev mapper rhel-root did the trick on a living system     df -h Filesystem             Size  Used Avail Use  Mounted on  dev mapper rhel-root   47G   47G   20M 100    devtmpfs               1 9G     0  1 9G   0   dev tmpfs                  1 9G     0  1 9G   0   dev shm tmpfs                  1 9G  9 3M  1 9G   1   run tmpfs                  1 9G     0  1 9G   0   sys fs cgroup  dev sda1             1014M  205M  810M  21   boot tmpfs                  379M  8 0K  379M   1   run user 42 tmpfs                  379M     0  379M   0   run user 1000     lvresize -l  100 FREE  dev mapper rhel-root   Size of logical volume rhel root changed from  lt 47 00 GiB  12031 extents  to  lt 77 00 GiB  19711 extents     Logical volume rhel root successfully resized      xfs growfs  dev mapper rhel-root meta-data  dev mapper rhel-root  isize 512    agcount 7  agsize 1900032 blks                                  sectsz 512   attr 2  projid32bit 1                                  crc 1        finobt 0 spinodes 0 data                             bsize 4096   blocks 12319744  imaxpct 25                                  sunit 0      swidth 0 blks naming    version 2              bsize 4096   ascii-ci 0 ftype 1 log       internal               bsize 4096   blocks 3711  version 2                                  sectsz 512   sunit 0 blks  lazy-count 1 realtime  none                   extsz 4096   blocks 0  rtextents 0 data blocks changed from 12319744 to 20184064     df -h Filesystem             Size  Used Avail Use  Mounted on  dev mapper rhel-root   77G   47G   31G  62    devtmpfs               1 9G     0  1 9G   0   dev tmpfs                  1 9G     0  1 9G   0   dev shm tmpfs                  1 9G  9 3M  1 9G   1   run tmpfs                  1 9G     0  1 9G   0   sys fs cgroup  dev sda1             1014M  205M  810M  21   boot tmpfs                  379M  8 0K  379M   1   run user 42 tmpfs                  379M     0  379M   0   run user 1000

User · Answer

After a bit of trial and error    as mentioned in the possible answers  it turned out to require xfs growfs rather than resize2fs   CentOS 7   fdisk  dev xvda   Create new primary partition  set type as linux lvm   n p 3 t 8e w   Create a new primary volume and extend the volume group to the new volume   partprobe pvcreate  dev xvda3 vgextend  dev centos  dev xvda3   Check the physical volume for free space  extend the logical volume with the free space   vgdisplay -v lvextend -l 288  dev centos root   Finally perform an online resize to resize the logical volume  then check the available space   xfs growfs  dev centos root df -h

User · Answer

CentOS7   VM  Ive made it with    Gparted-live extend the volume pvresize -v  dev sda2 lvresize -r -l 100 FREE centos root

User · Answer

How to resize root partition online      1    root oel7     df -h   Filesystem                         Size  Used Avail Use  Mounted on    dev mapper root vg-root           5 0G  4 5G  548M  90     2      PV  dev sda2   VG root vg     lvm2  6 00 GiB   0    free   as here it shows that there is no space left on root vg volume group  so first i need to extend VG   3     root oel7     vgextend root vg  dev sdb5      Volume group  root vg  successfully extended  4      root oel7     pvscan       PV  dev sda2   VG root vg     lvm2  6 00 GiB   0    free        PV  dev sdb5   VG root vg     lvm2  2 00 GiB   2 00 GiB free   5   Now extend the logical volume      root oel7     lvextend -L  1G  dev root vg root      Size of logical volume root vg root changed from 5 00 GiB  1280 extents  to 6 00 GiB  1536 extents     Logical volume root successfully resized    3    root oel7     resize2fs  dev root vg root    resize2fs 1 42 9  28-Dec-2013    resize2fs  Bad magic number in super-block while trying to open  dev root vg   root   Couldn t find valid filesystem superblock     as root partition is not a ext  partiton so   you resize2fs will not work for you     4   to check the filesystem type of a partition   root oel7     df -Th   Filesystem                        Type      Size  Used Avail Use  Mounted on    dev mapper root vg-root          xfs       6 0G  4 5G  1 6G  75      devtmpfs                          devtmpfs  481M     0  481M   0   dev   tmpfs                             tmpfs     491M   80K  491M   1   dev shm   tmpfs                             tmpfs     491M  7 1M  484M   2   run   tmpfs                             tmpfs     491M     0  491M   0   sys fs   cgroup  dev mapper data vg-home          xfs       3 5G  2 9G  620M  83   home    dev sda1                         xfs       497M  132M  365M  27   boot    dev mapper data vg01-data lv001  ext3      4 0G  2 4G  1 5G  62   sybase    dev mapper data vg02-backup lv01 ext3      4 0G  806M  3 0G  22   backup    above command shows that root is an xfs filesystem   so we are sure that we need to use xfs growfs command to resize the partition   6    root oel7     xfs growfs  dev root vg root   meta-data  dev mapper root vg-root isize 256    agcount 4  agsize 327680 blks                                  sectsz 512   attr 2  projid32bit 1                                  crc 0        finobt 0 data                             bsize 4096   blocks 1310720  imaxpct 25                                  sunit 0      swidth 0 blks naming    version 2              bsize 4096   ascii-ci 0 ftype 0 log       internal               bsize 4096   blocks 2560  version 2                                  sectsz 512   sunit 0 blks  lazy-count 1 realtime  none                   extsz 4096   blocks 0  rtextents 0 data blocks changed from 1310720 to 1572864     root oel7     df -Th    Filesystem                        Type      Size  Used Avail Use  Mounted on  dev mapper root vg-root          xfs       6 0G  4 5G  1 6G  75

User · Answer

To resize the existing volume mounted sudo mount -t xfs  dev sdf  opt data  mount   opt data   dev nvme1n1 already mounted on  opt data  sudo xfs growfs  opt data

User · Answer

On centos and fedora work with fsadm  fsadm resize  dev vg name root

User · Answer

On Centos 7  in answer to the original question where resize2fs fails with  bad magic number  try using fsadm as follows   fsadm resize  dev the-device-name-returned-by-df   Then   df        to confirm the size changes have worked

User · Answer

resize2fs  Command will not work for all file systems   Please confirm the file system of your instance using below command    Please follow the procedure to expand volume by following the steps mentioned in Amazon official document for different file systems   https   docs aws amazon com AWSEC2 latest UserGuide recognize-expanded-volume-linux html  Default file system in Centos is xfs  use the following command for xfs file system to increase partition size   sudo xfs growfs -d     then  df -h  to check

[lvm] resize2fs: Bad magic number in super-block while trying to open

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