LVM

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Revision as of 15:50, 16 February 2013 by Thomaspurchas (talk | contribs) (→‎Resizing a drive)
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Below is a load of dumps from the LVM system on village.

Physical Volumes pvdisplay

  --- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               lvmfiles
  PV Size               931.51 GiB / not usable 3.19 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              238466
  Free PE               0
  Allocated PE          238466
  PV UUID               0dUblD-zgsH-9s6Q-u8zf-LXIT-jNrg-xh1CRe
   
  --- Physical volume ---
  PV Name               /dev/sdc1
  VG Name               lvmfiles
  PV Size               931.51 GiB / not usable 3.19 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              238466
  Free PE               219140
  Allocated PE          19326
  PV UUID               BfWIaH-uKm3-oTWd-EF0h-7rAG-NxQr-oO3wF0
   
  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               lvmskynet
  PV Size               228.69 GiB / not usable 1.89 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              58545
  Free PE               45433
  Allocated PE          13112
  PV UUID               O2ZbFp-OcHn-QRdz-L3OS-hndQ-oOP0-2cdfZq

Volume groups vgdisplay

  --- Volume group ---
  VG Name               lvmfiles
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  23
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                6
  Open LV               6
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               1.82 TiB
  PE Size               4.00 MiB
  Total PE              476932
  Alloc PE / Size       257792 / 1007.00 GiB
  Free  PE / Size       219140 / 856.02 GiB
  VG UUID               OlfSXF-Mpro-rtSM-YOAI-kbek-lGql-wMijpI
   
  --- Volume group ---
  VG Name               lvmskynet
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               4
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               228.69 GiB
  PE Size               4.00 MiB
  Total PE              58545
  Alloc PE / Size       13112 / 51.22 GiB
  Free  PE / Size       45433 / 177.47 GiB
  VG UUID               mxwF0z-8GXs-Sm8N-3UEd-Yd7W-2i6T-zBFs9c

Logical Volumes lvdisplay

  --- Logical volume ---
  LV Name                /dev/lvmfiles/home
  VG Name                lvmfiles
  LV UUID                dqaHbW-hc6l-wUC5-ZIKh-qqkY-l7ht-1IQVQM
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                120.00 GiB
  Current LE             30720
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:1
   
  --- Logical volume ---
  LV Name                /dev/lvmfiles/publicity
  VG Name                lvmfiles
  LV UUID                AESS8v-XNba-p12U-UQGK-dh5s-4SZx-ZUXp3m
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                220.00 GiB
  Current LE             56320
  Segments               5
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:2
   
  --- Logical volume ---
  LV Name                /dev/lvmfiles/media
  VG Name                lvmfiles
  LV UUID                L61nI1-9Rce-kRwf-DsQe-KVq2-c7K1-vNHzBO
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                100.00 GiB
  Current LE             25600
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:3
   
  --- Logical volume ---
  LV Name                /dev/lvmfiles/storage
  VG Name                lvmfiles
  LV UUID                vc1Wfr-N0qN-9NTd-Jvoq-ZiVZ-ko2b-shylYS
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                100.00 GiB
  Current LE             25600
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:4
   
  --- Logical volume ---
  LV Name                /dev/lvmfiles/dcinema
  VG Name                lvmfiles
  LV UUID                im2vFb-XIHr-7Pgu-jzj2-qucd-8vIb-y2iyp2
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                417.00 GiB
  Current LE             106752
  Segments               5
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:5
   
  --- Logical volume ---
  LV Name                /dev/lvmfiles/marketing
  VG Name                lvmfiles
  LV UUID                qKQHL2-FR02-WTlI-fNZp-eE52-zn2U-Px7qwr
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:6
   
  --- Logical volume ---
  LV Name                /dev/lvmskynet/root
  VG Name                lvmskynet
  LV UUID                hzPsI2-S3dy-a4ev-r6JQ-ICC6-dPH7-7oIBhf
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                9.31 GiB
  Current LE             2384
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:0
   
  --- Logical volume ---
  LV Name                /dev/lvmskynet/usr
  VG Name                lvmskynet
  LV UUID                d15cO9-myXP-KeKJ-Kxz5-DUUN-MKuc-8fZubf
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                18.62 GiB
  Current LE             4768
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:7
   
  --- Logical volume ---
  LV Name                /dev/lvmskynet/var
  VG Name                lvmskynet
  LV UUID                NRJ1cE-Gds2-CTNv-U6WD-qfWb-vu8y-PkeKql
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                18.62 GiB
  Current LE             4768
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:8
   
  --- Logical volume ---
  LV Name                /dev/lvmskynet/tmp
  VG Name                lvmskynet
  LV UUID                a8XzQa-DbSY-FqMb-uSkb-HwLt-Ltls-Cxzhhp
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                4.66 GiB
  Current LE             1192
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:9

df dump df -h (Correct as of 15th Feb)

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/lvmskynet-root
                      9.2G  738M  8.0G   9% /
tmpfs                 1.9G     0  1.9G   0% /lib/init/rw
udev                  1.9G  220K  1.9G   1% /dev
tmpfs                 1.9G     0  1.9G   0% /dev/shm
/dev/sda1             464M   39M  401M   9% /boot
/dev/mapper/lvmskynet-tmp
                      4.6G  138M  4.3G   4% /tmp
/dev/mapper/lvmskynet-usr
                       19G  1.2G   17G   7% /usr
/dev/mapper/lvmskynet-var
                       19G  1.3G   17G   8% /var
/dev/mapper/lvmfiles-home
                      119G   96G   17G  86% /home
/dev/mapper/lvmfiles-media
                       99G   92G  2.3G  98% /export/media
/dev/mapper/lvmfiles-storage
                       99G   20G   75G  21% /export/storage
/dev/mapper/lvmfiles-marketing
                       50G   38G  9.5G  80% /export/marketing
/dev/mapper/lvmfiles-publicity
                      217G  160G   46G  78% /export/publicity
/dev/mapper/lvmfiles-dcinema
                      411G  328G   63G  85% /export/dcinema

This means that currently 734GB of space is currently being used.

Resizing a drive

This process take about 20mins, and requires that the drive be un-mounted. Thus you will want to make sure that people aren't using the drive at the time.

Be aware that you need sudo privileges to do any of this.

The process is made up of five steps:

  1. Extending the Logical Volume in LVM
  2. Un-mounting the drive being expanded
  3. Running a file system check on the drive
  4. Expanding the file system to match the expanded size of the logical volume
  5. Re-mounting the drive

Extending the Logical Volume can be done with the drive online using the lvextend command. The -L+50G flag tells LVM to expand the drive by 50GB. 

lvextend -L+50G /dev/lvmfiles/publicity

Un-mounting the drive is required to expand the file system safely (It could potential be done online, but it's risker and Village may or may not have the correct kernel patches). 

umount /export/publicity

Now we need to run a filesystem check before expanding the filesystem. If you don't then the filesystem resize command will complain at you.

This step takes the longest, and the time it take will depend on the size of the drive, but pencil in 20mins or so. 

e2fsck -f  /dev/lvmfiles/publicity

Now we can actually expand filesystem to make use of the additional space in the Logical Volume. 

resize2fs /dev/lvmfiles/publicity

Finally re-mount the drive, and check that nothing broke. 

mount /export/publicity
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