Topic: extend RAID volume

[lmp]

Hello,

I have one SME 8.2 server with software raid, no LVM. It is raid1 with 3 disks in mirror. Now I need to extend root partition. It has only boot and root. I have changed all the disks like in the wiki, rebuild was successful. And now I have larger MD device.
Problem is that rersize2fs dosen't extend file system, despite md device is twice as big.
Any ideas what I'm doing wrong and how to extend file system?

Little more detailed info:

Code: [Select]

df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/main-root
                      442G  356G   64G  85% /
/dev/md1               99M   27M   68M  29% /boot
tmpfs                 3.9G     0  3.9G   0% /dev/shm

resize2fs /dev/mapper/main-root
resize2fs 1.39 (29-May-2006)
The filesystem is already 119537664 blocks long.  Nothing to do!

 cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdc1[2] sdb1[1] sda1[0]
      104320 blocks [3/3] [UUU]
     
md2 : active raid1 sdc2[0] sdb2[2] sda2[1]
      976655488 blocks [3/3] [UUU]
     
unused devices: <none>

mdadm --query --detail /dev/md2
/dev/md2:
        Version : 0.90
  Creation Time : Sun Feb  3 22:25:52 2013
     Raid Level : raid1
     Array Size : 976655488 (931.41 GiB 1000.10 GB)
  Used Dev Size : 976655488 (931.41 GiB 1000.10 GB)
   Raid Devices : 3
  Total Devices : 3
Preferred Minor : 2
    Persistence : Superblock is persistent

    Update Time : Sat Nov  5 16:54:33 2016
          State : clean
 Active Devices : 3
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 0

           UUID : 636e4bf6:cd1064fe:5a7cf11b:9b4305a3
         Events : 0.23400

    Number   Major   Minor   RaidDevice State
       0       8       34        0      active sync   /dev/sdc2
       1       8        2        1      active sync   /dev/sda2
       2       8       18        2      active sync   /dev/sdb2

fdisk -l /dev/md2

Disk /dev/md2: 1000.0 GB, 1000095219712 bytes
2 heads, 4 sectors/track, 244163872 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md2 doesn't contain a valid partition table


[Stefano]

You're using LVM (see /dev/mapper...)

Follow wiki howto, that's all

[lmp]

Thank you very much.
I just don't understand (not strong in linux raid) for me it sounds a bit crazy, LVM on top of raid volume.

Code: [Select]

pvdisplay
  --- Physical volume ---
  PV Name               /dev/md2
  VG Name               main
  PV Size               931.41 GB / not usable 4.94 MB
  Allocatable           yes
  PE Size (KByte)       32768
  Total PE              29805
  Free PE               12
  Allocated PE          29793
  PV UUID               10xOgx-fAj5-H479-eDpt-g8kj-BYAu-yVCJSK
   
Or am I something missing?
Thanks again 

[Stefano]

no, you're right..

if you have a (real) HW raid, you'd have LVM on top of your raid device..
since you're using SW raid, it sit on top of mdX devices

did you manage in resizing?
https://wiki.contribs.org/Raid#Upgrading_the_Hard_Drive_Size (BTW, read all the page, it's useful )

[lmp]

when you noted it's LVM, it was easy.
I have read a lot of wiki docs, including this one, just somehow missed this "mapper" thing. 

Thanks again
Cheers!

[guest22]

As a friendly reminder, please note that Koozali SME Server 8.x will be END OF LIFE in 4 months. Please focus any effort on Koozali SME Server 9.x.