RAID+LVM LTSP install

[ermeyers]

I've been reading the various pages on http://help.ubuntu.com (http://help.ubuntu.com/) regarding RAID and LVM.

https://help.ubuntu.com/9.04/serverguide/C/advanced-installation.html

http://https://help.ubuntu.com/community/Installation#Installing on external or RAID hard disks (http://https//help.ubuntu.com/community/Installation#Installing%20on%20external%20or%20RAI D%20hard%20disks)

http://https://help.ubuntu.com/community/Installation/LVMOnRaid (http://https//help.ubuntu.com/community/Installation/LVMOnRaid)

http://https://help.ubuntu.com/community/Installation/SoftwareRAID (http://https//help.ubuntu.com/community/Installation/SoftwareRAID)

http://https://help.ubuntu.com/community/Installation/RAID1%2BLVM (http://https//help.ubuntu.com/community/Installation/RAID1%2BLVM)

I want to install Ubuntu LTSP servers with both SW_RAID and LVM. I have a server named ltsp which has 4 scsi disks /dev/sd[abcd]. Using the LTSP server install selection on the Alternate CD, and selecting "Guided - use the entire disk and setup LVM" partitioning, the VG=ltsp, LV=root|swap_1 are created. I like this basic LVM setup, so I'd like to emulate its LVM organization, when adding RAID to it.


root@lts1:~# ls -l /dev/ltsp
total 0
lrwxrwxrwx 1 root root 21 2009-09-11 15:02 root -> /dev/mapper/ltsp-root
lrwxrwxrwx 1 root root 23 2009-09-11 15:02 swap_1 -> /dev/mapper/ltsp-swap_1
Abbreviated:


root@ltsp:~# lshw -C disk
*-cdrom
...
*-disk:0
logical name: /dev/sda
size: 8683MiB (9105MB)
*-disk:1
logical name: /dev/sdb
size: 8683MiB (9105MB)
*-disk:2
logical name: /dev/sdc
size: 16GiB (18GB)
*-disk:3
logical name: /dev/sdd
size: 8683MiB (9105MB)
Following the https://help.ubuntu.com/9.04/serverguide/C/advanced-installation.html RAID section, I partitioned the disks for RAID, as follows:


sda 9.1G
1 pri 452.4 MB K raid (RAID1 active for swap)
2 pri 8.6 GB K raid (RAID10 active for / part 1)
sdb 9.1 GB
1 pri 9.1 GB K raid (RAID10 active for / part 2)
sdc 18.2 GB
1 pri 452.4 MB K raid (RAID1 spare for swap)
2 pri 8.6 GB K raid (RAID10 spare for / part 1)
sdd 9.1 GB
1 pri 9.1 GB K raid (RAID10 spare for / part 2)
The problem that I'm having is that the section "Logical Volume Manager (LVM)" in the page https://help.ubuntu.com/9.04/serverguide/C/advanced-installation.html talks about LVM install without RAID.

How do I continue from the RAID into adding LVM?

Thanks,
Eric

[dstew]

I think once you have your RAID set up, you can create a logical volume out of the RAID partitions, just as if they were physical disk partitions. I think you create the RAID first, then the logical volume group out of the RAID, using the pvcreate and vgcreate commands. You just use RAID partition device names as the arguments. It's been a while since I did this, though, and I could be wrong.

[ermeyers]

I got into it, and saw as you said. Pretty easy really, once you see it a couple of times. Please see my thread http://ubuntuforums.org/showthread.php?t=1292411 . Thanks.

[ermeyers]

Update [SOLVED] and should be useful for others with multiple disks wanting RAID10-LVM-EXT4 configurations. I performed Manual Disk Partitioning using the Alternate Install CD.

lts1 Server Hardware:
* NCR server, 4 Pentium III (i686) 32 bit processors and 2 GB RAM
*** lshw -c CPU
** SCSI disks
*** lshw -c DISK
**** four disks: sd[abd]=9.1GB, sdc=18.2GB

Disk Partitioning Plan for RAID10-LVM-EXT4 Configuration:

RAID10 Configuration:

* Active RAID partitions: sd[abd]
* Spare RAID partitions: sdc

* DISKS: sd[abd]=9.1 GB
** Primary [1] 100 MB RAID type FD (boot)
** Logical [5] 450 MB RAID type FD (swap)
** Logical [6] 8.6 GB RAID type FD (os)

* DISK sdc=18.2 GB
** Primary [1] 100 MB RAID type FD (boot)
** Logical [5] 450 MB RAID type FD (swap)
** Logical [6] 8.6 GB RAID type FD (os)
** Logical [7] 9.1 GB EXT4 type 83 (extra)

1. RAID10 md0 with LVM VG-LV
** [3] md0-active=sd[abd]1
** [1] md0-spares=sdc1
** vg=lts-boot
** lv=lts-boot-lv
** Format type ext4 and mount as /boot

2. RAID10 md1 with LVM VG-LV
** [3] md1-active=sd[abd]5
** [1] md1-spares=sdc5
** vg=lts-swap
** lv=lts-swap-lv
** Format type swap

3. RAID10 md2 with LVM VG-LV
** [3] md2-active=sd[abd]6
** [1] md2-spares=sdc6
** vg=lts-os
** lv=lts-os-lv
** Format type ext4 and mount as /