PV, VG, LM exercise lsblk vgcreate lvcreate mkfs.xfs lvs vgs vgextend

By OK -
we can resize root filesystem with LVM running it

 fdsik /dev/sdc

Disk /dev/sdc: 10.7 GB, 10737418240 bytes, 20971520 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: 0xcbbe4aaa

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1            2048      104447       51200   83  Linux
/dev/sdc2          104448      186367       40960   83  Linux
/dev/sdc3          186368      595967      204800   8e  Linux LVM

Command (m for help): w

partprobe /dev/sdc

=========================
[root@localhost ~]# cat /proc/partitions 
major minor  #blocks  name

   8        0   41943040 sda
...
...
   8       32   10485760 sdc
   8       33      51200 sdc1
   8       34      40960 sdc2
   8       35     204800 sdc3
  11        0    8086528 sr0
 253        0   38789120 dm-0
 253        1    2097152 dm-1
 253        2      94208 dm-2
[root@localhost ~]#

==========================
[root@localhost ~]# lsblk 
...
...
sdc                      8:32   0   10G  0 disk 
├─sdc1                   8:33   0   50M  0 part /sdcmount
├─sdc2                   8:34   0   40M  0 part /lsdc
└─sdc3                   8:35   0  200M  0 part 
sr0                     11:0    1  7.7G  0 rom  /run/media/bit/CentOS 7 x86_64
[root@localhost ~]# 

==========================
[root@localhost ~]# pvcreate /dev/sdc3 
(optional step) 
if you run vgcreate it will automatically create physical volume

WARNING: swap signature detected on /dev/sdc3 at offset 4086. Wipe it? [y/n]: y
  Wiping swap signature on /dev/sdc3.
  Physical volume "/dev/sdc3" successfully created.
[root@localhost ~]#
==========================
[root@localhost ~]# vgcreate vgwhatever /dev/sdc3
  Volume group "vgwhatever" successfully created

[root@localhost ~]# vgs
  VG          #PV #LV #SN Attr   VSize   VFree  
  cl            1   2   0 wz--n-  39.00g   4.00m
  vg_sdbmount   1   1   0 wz--n-  96.00m   4.00m
  vgwhatever    1   0   0 wz--n- 196.00m 196.00m
[root@localhost ~]# 
==========================
[root@localhost ~]# lvcreate -n lvmyvol -L 100M vgwhatever 
  Logical volume "lvmyvol" created.
[root@localhost ~]# 
==========================
[root@localhost ~]# mkfs.xfs /dev/vgwhatever/lvmyvol 
meta-data=/dev/vgwhatever/lvmyvol isize=512    agcount=4, agsize=6400 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=25600, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=855, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
[root@localhost ~]#
==========================
lvs — report information about logical volumes

[root@localhost ~]# lvs
  LV      VG          Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root    cl          -wi-ao----  36.99g                                                 
  swap    cl          -wi-ao----   2.00g                                                 
  lv_sdb  vg_sdbmount -wi-a-----  92.00m                                                 
  lvmyvol vgwhatever  -wi-a----- 100.00m                                                 
[root@localhost ~]# 
==========================
[root@localhost ~]# mkdir /hallo; mount /dev/vgwhatever/lvmyvol /hallo
[root@localhost ~]# mount | grep my
/dev/mapper/vgwhatever-lvmyvol on /hallo type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
[root@localhost ~]# 
===========================
[root@localhost ~]# cd /hallo/
[root@localhost hallo]# dd if=/dev/zero of=bigfile
dd: writing to ‘bigfile’: No space left on device
187329+0 records in
187328+0 records out
95911936 bytes (96 MB) copied, 0.360617 s, 266 MB/s
[root@localhost hallo]# 
==========================
[root@localhost hallo]# df -hk
Filesystem                     1K-blocks    Used Available Use% Mounted on
/dev/mapper/cl-root             38770180 4735892  34034288  13% /
devtmpfs                          488984       0    488984   0% /dev
tmpfs                             499968     156    499812   1% /dev/shm
tmpfs                             499968    7236    492732   2% /run
tmpfs                             499968       0    499968   0% /sys/fs/cgroup

/dev/sr0                         8086368 8086368         0 100% /run/media/bit/CentOS 7 x86_64
/dev/mapper/vgwhatever-lvmyvol     98980   98960        20 100% /hallo
[root@localhost hallo]# 

/dev/mapper/vgwhatever-lvmyvol - mapper word is how the kernel sees
===========================
Logical volumes need space from in volume group
To add space to volume group, we need space in physical group

check free volume group
[root@localhost hallo]# vgs
  VG          #PV #LV #SN Attr   VSize   VFree 
  cl            1   2   0 wz--n-  39.00g  4.00m
  vg_sdbmount   1   1   0 wz--n-  96.00m  4.00m
  vgwhatever    1   1   0 wz--n- 196.00m 96.00m
[root@localhost hallo]# 
===========================
If there is no free space, we have to run
pvcreate and vgextend commands as well
===========================
[root@localhost hallo]# lvextend -L +50M -r /dev/vgwhatever/lvmyvol 
  Rounding size to boundary between physical extents: 52.00 MiB.
  Size of logical volume vgwhatever/lvmyvol changed from 100.00 MiB (25 extents) to 152.00 MiB (38 extents).
  Logical volume vgwhatever/lvmyvol successfully resized.
meta-data=/dev/mapper/vgwhatever-lvmyvol isize=512    agcount=4, agsize=6400 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=25600, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=855, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 25600 to 38912
===============================
[root@localhost hallo]# df -kh
Filesystem                      Size  Used Avail Use% Mounted on
/dev/mapper/vgwhatever-lvmyvol  149M   97M   52M  66% /hallo
[root@localhost hallo]# 




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