Create partition and Extend reiserfs File System in Linux LVM

Create partition and Extend reiserfs File System in Linux LVM

In Linux, when adding a new disk use this to rescan the bus with the following command

echo "- - -" > /sys/class/scsi_host/host0/scan

In the above command the the hyphens represent controller,channel,lun, so – - – indicates all controllers, all channels and all luns should be scanned.

In Linux, when expanding an existing disk
For Existing disk ...which is resized.
   echo 1 > /sys/class/scsi_device/0\:0\:0\:0/device/rescan
   echo 1 > /sys/class/scsi_device/0\:0\:1\:0/device/rescan
   echo 1 > /sys/class/scsi_device/0\:0\:2\:0/device/rescan
   echo 1 > /sys/class/scsi_device/2\:0\:0\:0/device/rescan

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Add a Disk to LVM:
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1.take the output of

lvmdiskscan

fdisk -l

2. Scan the newly added disk.

echo "- - -" > /sys/class/scsi_host/host#/scan

3. Check the output of

lvmdiskscan
fdisk -l
lsscsi
List existing drives.

fdisk /dev/sdb (This step is optional, If you want to use the whole disk under LVM , you can directly proceed to "pvcreate")
Once formatted, then we need to create Physical Volume out of it.
I've 3 partition on this disk as of now. I'll create another partition on it.

linux-test2-Server1:~ # fdisk /dev/sdb

Command (m for help): p

Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders, total 2097152 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 identifier: 0x46faf531

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048      206847      102400   83  Linux
/dev/sdb2          206848      411647      102400   83  Linux
/dev/sdb3          411648      616447      102400   83  Linux

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Selected partition 4
First sector (616448-2097151, default 616448):
Using default value 616448
Last sector, +sectors or +size{K,M,G} (616448-2097151, default 2097151): +100M

Command (m for help): p

Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders, total 2097152 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 identifier: 0x46faf531

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048      206847      102400   83  Linux
/dev/sdb2          206848      411647      102400   83  Linux
/dev/sdb3          411648      616447      102400   83  Linux
/dev/sdb4          616448      821247      102400   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
linux-test2-Server1:~ #

Now Do a "partprobe" for updating Kernel table.

linux-test2-Server1:~ # partprobe
Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only.
linux-test2-Server1:~ # lvmdiskscan
  /dev/server/ftp   [     252.00 MiB]
  /dev/sda1         [     548.00 MiB]
  /dev/server/home1 [      36.00 MiB]
  /dev/root         [       9.46 GiB]
  /dev/sdb1         [     100.00 MiB] LVM physical volume
  /dev/sdb2         [     100.00 MiB] LVM physical volume
  /dev/sdb3         [     100.00 MiB] LVM physical volume
  /dev/sdb4         [     100.00 MiB]
  2 disks
  3 partitions
  0 LVM physical volume whole disks
  3 LVM physical volumes
linux-test2-Server1:~ #

Now add the partition to LVM.

linux-test2-Server1:~ # pvcreate /dev/sdb4
  Physical volume "/dev/sdb4" successfully created
linux-test2-Server1:~ #

linux-test2-Server1:~ # lvmdiskscan
  /dev/server/ftp   [     252.00 MiB]
  /dev/sda1         [     548.00 MiB]
  /dev/server/home1 [      36.00 MiB]
  /dev/root         [       9.46 GiB]
  /dev/sdb1         [     100.00 MiB] LVM physical volume
  /dev/sdb2         [     100.00 MiB] LVM physical volume
  /dev/sdb3         [     100.00 MiB] LVM physical volume
  /dev/sdb4         [     100.00 MiB] LVM physical volume
  2 disks
  2 partitions
  0 LVM physical volume whole disks
  4 LVM physical volumes

Now extend the VG.

linux-test2-Server1:~ # vgs
  VG     #PV #LV #SN Attr   VSize   VFree
  server   3   2   0 wz--n- 288.00m    0
linux-test2-Server1:~ # vgextend server /dev/sdb4
  Volume group "server" successfully extended
linux-test2-Server1:~ # vgs
  VG     #PV #LV #SN Attr   VSize   VFree
  server   4   2   0 wz--n- 384.00m 96.00m
linux-test2-Server1:~ #

linux-test2-Server1:~ # lvs
  LV    VG     Attr      LSize   Pool Origin Data%  Move Log Copy%  Convert
  ftp   server -wi-ao--- 252.00m
  home1 server -wi-ao---  36.00m
linux-test2-Server1:~ #
linux-test2-Server1:~ # lvextend -L +40M /dev/server/home1
  Extending logical volume home1 to 76.00 MiB
  Logical volume home1 successfully resized
linux-test2-Server1:~ # lvs
  LV    VG     Attr      LSize   Pool Origin Data%  Move Log Copy%  Convert
  ftp   server -wi-ao--- 252.00m
  home1 server -wi-ao---  76.00m
linux-test2-Server1:~ #

Now extend the reiserfs File system.

linux-test2-Server1:~ # umount /home1

linux-test2-Server1:~ # resize_reiserfs /dev/server/home1
resize_reiserfs 3.6.21 (2009 www.namesys.com)

ReiserFS report:
blocksize             4096
block count           19456 (9216)
free blocks           11232 (992)
bitmap block count    1 (1)

Syncing..done


resize_reiserfs: Re sizing finished successfully.

 linux-test2-Server1:~ # mount -a
linux-test2-Server1:~ # df -h /home1
Filesystem                Size  Used Avail Use% Mounted on
/dev/mapper/server-home1   76M   33M   44M  43% /home1
linux-test2-Server1:~ #

find the Video @ https://youtu.be/iruNUbsj0_I