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drunkahol
n00b
Joined: 26 Jul 2005
Posts: 19
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 Posted: Wed Jul 27, 2005 9:27 am Post subject: Mounting LVM2 from other distro install |
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Hi
I've managed to get my Gentoo install working again now, and I'm straight off on the next kamikaze mission.
My machine has a main installation of Fedora Core 4 using LVM2 partitions. The Gentoo partition is a sandbox install at the moment, until I decide I like it enough that I switch over for good.
What I'd like to do is mount the LVM2 partitions from my Gentoo install, as that's where all my music sits. Don't tell me I put in all that effort getting ALSA working for no reason.
I can "see" the partitions from my Gentoo boot:
| Code: | desktop ~ # vgscan
Reading all physical volumes. This may take a while...
Found volume group "vg_root" using metadata type lvm2
desktop ~ # lvscan
/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failure to communicate with kernel device-mapper driver.
inactive '/dev/vg_root/lv_root' [82.16 GB] inherit
inactive '/dev/vg_root/lv_swap' [1.94 GB] inherit
desktop ~ # vgdisplay
--- Volume group ---
VG Name vg_root
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failure to communicate with kernel device-mapper driver.
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 84.16 GB
PE Size 32.00 MB
Total PE 2693
Alloc PE / Size 2691 / 84.09 GB
Free PE / Size 2 / 64.00 MB
VG UUID d1xfPj-T7hu-26bC-HwtU-7snV-Cs0P-mbzXGh
desktop ~ # lvdisplay
/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failure to communicate with kernel device-mapper driver.
--- Logical volume ---
LV Name /dev/vg_root/lv_root
VG Name vg_root
LV UUID lXWwpY-KZ4W-DRsI-YeTo-VcKb-dvxO-fI9ONz
LV Write Access read/write
LV Status NOT available
LV Size 82.16 GB
Current LE 2629
Segments 2
Allocation inherit
Read ahead sectors 0
--- Logical volume ---
LV Name /dev/vg_root/lv_swap
VG Name vg_root
LV UUID vtFYGu-qgao-yyaS-3RLb-0hsV-3UN9-CPZtHe
LV Write Access read/write
LV Status NOT available
LV Size 1.94 GB
Current LE 62
Segments 1
Allocation inherit
Read ahead sectors 0
desktop ~ #
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The message about device-mapper bothers me. I know I've installed it, because . . .
| Code: | desktop ~ # emerge --search device-mapper
Searching...
[ Results for search key : device-mapper ]
[ Applications found : 1 ]
* sys-fs/device-mapper
Latest version available: 1.01.00
Latest version installed: 1.01.00
Size of downloaded files: 854 kB
Homepage: http://sources.redhat.com/dm/
Description: Device mapper ioctl library for use with LVM2 utilities.
License: GPL-2 |
but I don't have the corresponding entries in /dev/ for /dev/vg_root or the logical volumes.
If this is going to be a complicated task, then I might just burn the .ogg's to a DVD and play them from there. Anyone able to assist?
Thanks in advance
Duncan |
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widan
Veteran
Joined: 07 Jun 2005
Posts: 1512
Location: Paris, France
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| Posted: Wed Jul 27, 2005 12:36 pm Post subject: |
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First, you need device mapper support in the kernel (the device-mapper package is the userspace library, which you already have). In menuconfig, it is in:
| Code: | Device Drivers --->
Multi-device support (RAID and LVM) --->
[*] Multiple devices driver support (RAID and LVM)
<*> Device mapper support |
(You can build it as a module if you want, you will need to "modprobe dm-mod" in that case.)
Then, run those commands, and you should see your LVM partitions:
| Code: | (if device-mapper built as a module)
# modprobe dm-mod
# vgscan
# vgchange -a y |
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drunkahol
n00b
Joined: 26 Jul 2005
Posts: 19
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| Posted: Wed Jul 27, 2005 3:04 pm Post subject: |
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Thanks
I'll give it a go and report back. I'd hoped that I'd recompiled the kernel for the last time, but there you go!
Cheers
Duncan |
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