Ubuntu 9.04

**Triton46** · 06-02-2010

HPDL385 with dual raid controllers (8 disks each). During the install of the ISO, it sees the raid controllers individually. I tried "One Generic Drive" but it still only partitions one of the raid controllers.

Is it possible after the OS is installed to configure the space as one logical volume?

**ptkobe** · 06-02-2010

Hi, Triton46, and welcome

You may use LVM, if you what you want is to use all 16 disks as one. Why do you want that?

with lvm you can create one volume group with all your raid/disks (those will be the physical volumes). Then you create logical volumes (one or more) that will act like partitions (but that can be extended/grow)

Any way, the idea is that with lvm you can create logical volumes and after (whenever you need) you may add space to them with space from the same or another disk/raid

See LVM HOWTO, Chapter 11 for a quick how it is done.

Hope that helps
Regards
Luis

PS: You may also use mdadm to make a software raid of your hardware raids if they have the same size.

**Triton46** · 06-02-2010

Thanks for the reply, yes, I'd like to create one big bucket. Could you walk me through how I would go about creating an LVM? I've been googling around but finding little information.

**ptkobe** · 06-03-2010

LVM HOWTO, is all there, I guess

You have physical volumes, that's your hard drives or hardware/software raids. You can make a volume group with them. Then you can make one or several logical volumes out of it.
logical volumes is what you use.

Like I have two volumes groups (on karmic 9.10, lvm2)

Code:

$ sudo vgdisplay
  --- Volume group ---
  VG Name               vgraid0
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               15.32 GB
  PE Size               4.00 MB
  Total PE              3922
  Alloc PE / Size       3072 / 12.00 GB
  Free  PE / Size       850 / 3.32 GB
  VG UUID               BG3CUG-3FWk-6rKb-t3tI-8NdP-mKhS-6Ckmvj
   
  --- Volume group ---
  VG Name               vgraid1
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  12
  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               120.50 GB
  PE Size               4.00 MB
  Total PE              30847
  Alloc PE / Size       30847 / 120.50 GB
  Free  PE / Size       0 / 0   
  VG UUID               V897j7-BTCg-3NeA-Rc0G-igu9-4Zwd-UOHpGn

each one based on two mdadm raids (physical as far as lvm concern)

Code:

$ sudo pvdisplay
  --- Physical volume ---
  PV Name               /dev/md6
  VG Name               vgraid0
  PV Size               15.32 GB / not usable 256.00 KB
  Allocatable           yes 
  PE Size (KByte)       4096
  Total PE              3922
  Free PE               850
  Allocated PE          3072
  PV UUID               UFcA7G-ITRt-vh8N-SKmB-0QbL-vrRx-e4CSLh
   
  --- Physical volume ---
  PV Name               /dev/md2
  VG Name               vgraid1
  PV Size               120.50 GB / not usable 1.75 MB
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              30847
  Free PE               0
  Allocated PE          30847
  PV UUID               v2OcAK-R7nr-hClE-mfAf-b6M2-gcV3-lpTPv2

With those I made several logical volumes

Code:

$ sudo lvdisplay
  --- Logical volume ---
  LV Name                /dev/vgraid0/var
  VG Name                vgraid0
  LV UUID                z9DW66-PHRe-Ffey-1hjD-G2gR-E0et-Ht7chF
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                10.00 GB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0
   
  --- Logical volume ---
  LV Name                /dev/vgraid0/wpagefile
  VG Name                vgraid0
  LV UUID                11nawQ-WEd6-pwTE-wOg9-206b-9FLD-5ofqlL
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                2.00 GB
  Current LE             512
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1
   
  --- Logical volume ---
  LV Name                /dev/vgraid1/root
  VG Name                vgraid1
  LV UUID                ydlZHz-czqd-qvQ7-DLTN-T2q3-KBLk-XRurTI
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                5.00 GB
  Current LE             1280
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:2
   
  --- Logical volume ---
  LV Name                /dev/vgraid1/libvirt
  VG Name                vgraid1
  LV UUID                PwdtRY-2IBl-w0ra-xMAg-Nm2e-jL56-NYHfn2
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                40.00 GB
  Current LE             10240
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:3
   
  --- Logical volume ---
  LV Name                /dev/vgraid1/home
  VG Name                vgraid1
  LV UUID                DVt4re-gcLO-n3Jk-6Kjv-8dnl-uY7K-93xnYd
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                15.00 GB
  Current LE             3840
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:4
   
  --- Logical volume ---
  LV Name                /dev/vgraid1/backup
  VG Name                vgraid1
  LV UUID                bXjMMf-nP0X-RR7E-d0zg-F4uZ-IgSD-fv9pGL
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                60.50 GB
  Current LE             15487
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:5

Which I have mounted like this

Code:

$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc /proc                                                      proc    defaults        0       0
/dev/mapper/vgraid1-root /                                      xfs     defaults        0       1
# /boot was on /dev/md0 during installation
UUID=ec79891c-e0c6-4bb7-9ac1-7505cc31a095 /boot                 ext2    defaults        0       2
#/dev/mapper/vgraid0-var
UUID=f10e8375-c367-46e1-99f0-befc709e5753 /var                  xfs     defaults        0       2
# /dev/mapper/vgraid1-libvirt
UUID=55772291-a674-4949-8832-8322cf5b9108 /var/lib/libvirt	xfs	defaults	0	2
#/dev/mapper/vgraid1-home
UUID=8a6695e1-2ab7-402f-8dd0-4b7587891b9a /home                 xfs     defaults	0	2 
# swap was on /dev/md1 during installation
UUID=f2c7a5f8-a519-4f41-95aa-f775fef9b9ab none                  swap    sw              0       0
/dev/scd0 /media/cdrom0   udf,iso9660         user,noauto,exec,utf8                     0       0
/dev/fd0 /media/floppy0   auto                rw,user,noauto,exec,utf8                  0       0

192.168.xxx.yyy:/home/lpaulo/backup /home/lpaulo/backup			nfs	defaults,noauto	0	0
/dev/mapper/vgraid1-backup /mnt/temp_backup			xfs	defaults	0	3

To install lvm you may run
$ sudo apt-get install lvm2
and optionally
$ sudo apt-get install system-config-lvm

Post your questions as you go, and have fun

Regards
Luis

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