LVM extension

Adding a new raid storage to an existing LVM volume. Real life example. Two new disks added to a raid mirror first.

root@mylinux:~# mdadm --create /dev/md3 --level=1 --raid-devices=2 /dev/sdd1 /dev/sde1

 root@mylinux:~# vgdisplay vg1
  --- Volume group ---
  VG Name               vg1
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1.80 TiB
  PE Size               4.00 MiB
  Total PE              471654
  Alloc PE / Size       471654 / 1.80 TiB
  Free  PE / Size       0 / 0
  VG UUID               iIXHn9-h7s1-6oMw-uFvl-BJMk-Jc8N-lEBRX4
root@mylinux:~# lvdisplay vg1
  --- Logical volume ---
  LV Path                /dev/vg1/home
  LV Name                home
  VG Name                vg1
  LV UUID                CcQBbz-2GAZ-TwWm-zVva-RsRW-j1H9-L6djE6
  LV Write Access        read/write
  LV Creation host, time server, 2014-02-26 14:26:05 +0100
  LV Status              available
  # open                 1
  LV Size                1.80 TiB
  Current LE             471654
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0
root@mylinux:~# pvdisplay
  --- Physical volume ---
  PV Name               /dev/md2
  VG Name               vg1
  PV Size               1.80 TiB / not usable 4.81 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              471654
  Free PE               0
  Allocated PE          471654
  PV UUID               cnWVNt-iawf-fJxq-wgm9-dnmb-rB4y-ij5Oyg

  --- Physical volume ---
  PV Name               /dev/md1
  VG Name               VG0
  PV Size               18.61 GiB / not usable 4.88 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              4763
  Free PE               0
  Allocated PE          4763
  PV UUID               3QdqNr-g6yH-fnL6-5jEf-Jt1k-h03Y-2HPz0v

root@mylinux:~# pvcreate /dev/md3
  Physical volume "/dev/md3" successfully created
root@mylinux:~# pvdisplay
  --- Physical volume ---
  PV Name               /dev/md2
  VG Name               vg1
  PV Size               1.80 TiB / not usable 4.81 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              471654
  Free PE               0
  Allocated PE          471654
  PV UUID               cnWVNt-iawf-fJxq-wgm9-dnmb-rB4y-ij5Oyg

  --- Physical volume ---
  PV Name               /dev/md1
  VG Name               VG0
  PV Size               18.61 GiB / not usable 4.88 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              4763
  Free PE               0
  Allocated PE          4763
  PV UUID               3QdqNr-g6yH-fnL6-5jEf-Jt1k-h03Y-2HPz0v

  "/dev/md3" is a new physical volume of "3.64 TiB"
  --- NEW Physical volume ---
  PV Name               /dev/md3
  VG Name
  PV Size               3.64 TiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               dQiWVr-yKXE-3l7s-2s1x-y8TD-E1w4-GCc8aF
root@mylinux:~# vgdisplay
  --- Volume group ---
  VG Name               vg1
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1.80 TiB
  PE Size               4.00 MiB
  Total PE              471654
  Alloc PE / Size       471654 / 1.80 TiB
  Free  PE / Size       0 / 0
  VG UUID               iIXHn9-h7s1-6oMw-uFvl-BJMk-Jc8N-lEBRX4

  --- Volume group ---
  VG Name               VG0
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               18.61 GiB
  PE Size               4.00 MiB
  Total PE              4763
  Alloc PE / Size       4763 / 18.61 GiB
  Free  PE / Size       0 / 0
  VG UUID               ifFvFY-yt9A-w5g8-af3G-4Kf1-AJdn-Z7531i

root@mylinux:~# vgextend vg1
  Please enter a physical volume path
  Run `vgextend --help' for more information.
root@mylinux:~# vgextend vg1 /dev/md3
  Volume group "vg1" successfully extended
root@mylinux:~# vgdisplay
  --- Volume group ---
  VG Name               vg1
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               5.44 TiB
  PE Size               4.00 MiB
  Total PE              1425483
  Alloc PE / Size       471654 / 1.80 TiB
  Free  PE / Size       953829 / 3.64 TiB
  VG UUID               iIXHn9-h7s1-6oMw-uFvl-BJMk-Jc8N-lEBRX4

  --- Volume group ---
  VG Name               VG0
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               18.61 GiB
  PE Size               4.00 MiB
  Total PE              4763
  Alloc PE / Size       4763 / 18.61 GiB
  Free  PE / Size       0 / 0
  VG UUID               ifFvFY-yt9A-w5g8-af3G-4Kf1-AJdn-Z7531i

root@mylinux:~#
root@mylinux:~# lvextend -L+3.6TiB /dev/vg1/home
  Rounding size to boundary between physical extents: 3.60 TiB
  Extending logical volume home to 5.40 TiB
  Logical volume home successfully resized
  root@mylinux:~# vgdisplay
  --- Volume group ---
  VG Name               vg1
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               5.44 TiB
  PE Size               4.00 MiB
  Total PE              1425483
  Alloc PE / Size       1415373 / 5.40 TiB
  Free  PE / Size       10110 / 39.49 GiB
  VG UUID               iIXHn9-h7s1-6oMw-uFvl-BJMk-Jc8N-lEBRX4

  --- Volume group ---
  VG Name               VG0
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               18.61 GiB
  PE Size               4.00 MiB
  Total PE              4763
  Alloc PE / Size       4763 / 18.61 GiB
  Free  PE / Size       0 / 0
  VG UUID               ifFvFY-yt9A-w5g8-af3G-4Kf1-AJdn-Z7531i
root@mylinux:~# xfs_growfs /dev/vg1/home
meta-data=/dev/mapper/vg1-home   isize=256    agcount=32, agsize=15092928 blks
         =                       sectsz=4096  attr=2
data     =                       bsize=4096   blocks=482973696, imaxpct=5
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal               bsize=4096   blocks=235827, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 482973696 to 1449341952

root@mylinux:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VG0-per    19G  2.5G   17G  14% /
none                  4.0K     0  4.0K   0% /sys/fs/cgroup
udev                  3.9G  4.0K  3.9G   1% /dev
tmpfs                 795M  6.5M  789M   1% /run
none                  5.0M     0  5.0M   0% /run/lock
none                  3.9G     0  3.9G   0% /run/shm
none                  100M     0  100M   0% /run/user
/dev/sdc1             3.7T  1.9T  1.8T  52% /backup
/dev/mapper/vg1-home  5.4T  1.8T  3.7T  32% /home

APC Smart-UPS plan

Sometimes it's not easy to plan a complicated UPS shutdown and startup scheme. Here are some pictures about the settings if a SmartUPS X-3000 and its management software. The UPS itself has 3 outlets, two dedicated for servers, hosting virtual machines, and one for the network devices (switches) which always have to shuwdown last and startup first. These settings are optimized by me.

General settings

A nice graphical tool to set the processes...

...in the menu of Shutdown / Outlet sequence

How could the management host, connected to the UPS via USB, shutdown the other servers? It's not a trivial question. The answer is the default.cmd. That's executed by the management software when the general shutdown process is started. Its original content and my additions are the following:

@echo off
rem
rem   Maximize for best viewing
rem   This command file provides examples of proper command file syntax
rem
rem   Command Files run by PowerChute Business Edition must be placed in this directory.
rem
rem   Use the full path name of executable programs and external command files.
rem
rem   The @START command must be used to run executable programs (see example below).
rem   For the @START command, path names that include spaces must be enclosed in quotes;
rem   arguments for the executable must be outside the quotes.  A double quote must
rem   precede the quoted path name.  For example, to execute a command file in
rem   c:\Program Files\APC\PowerChute Business Edition\agent\cmdfiles called myShut.exe,
rem   the following line should be entered in the command file:
rem
rem   @START "" "c:\Program Files\APC\PowerChute Business Edition\agent\cmdfiles\myShut.exe"
rem
@echo on
NET USE \\my-backup\IPC$ MyPa$$word /USER:my\administrator
shutdown /s /m \\my-backup /c "UPS INITIATED SHUTDOWN!" /t 15