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#1 2008-08-30 12:55:21
- archIbald
- Member
- Registered: 2008-08-29
- Posts: 8
Arch Install Image lacks LVM Support?
Hi,
in the Wiki's Beginner's Guide to Arch as well as in the Installation Guide it is alleged that the install kernel
supports LVM and MD.
Well, this can't be quite true, or at least the LVM support, which relies on the Linux Device Mapper is broken.
Since I have given up Linux Installations on obsolete partitions completely in favour of LVM
(for its unparalleled storage maintenance flexibility, well maybe apart from ZFS)
I also expect from a decent distro's installer that it allows me to create an LVM setup during installation.
First I thought this was due to some bug on the CD image I got as a gift from the Arch exhibitors at FrOsCon 2008.
So I have just downloaded the Core 2008.06 ISO image for i686 and booted from that CD.
But this images shows the same lack of LVM support.
I had run script and had its dump written to a USB stick during my futile install attempt (see below).
Of course, I could also first install Arch into a conventional old-style partition and afterwards copy the OS
onto later created LVs.
But this is unnecessarily tedious in comparison to most current Linux distros whose kernels and kernel modules
from their rescue or install mode let you do all this.
Don't get me wrong, I am not expecting a a wizard or some shiny GUI here, in fact I am an avid user of the shell.
But for such rudimentary setup task where I don't fumble with exotic HW I don't feel terribly inclined to
mess around with drivers and having to build my own installation kernel.
For the folks who are into that there are distros like Gentoo or Linux From Scratch I suppose.
Below, some part of script's dump:
Script started on Sat 30 Aug 2008 12:00:45 PM CDT
[root@archlive ~]# uname -a
Linux archlive 2.6.25-ARCH #1 SMP PREEMPT Sat Jun 14 18:07:19 CEST 2008 i686 Mobile Intel(R) Pentium(R) 4 - M CPU 2.00GHz GenuineIntel GNU/Linux
[root@archlive ~]# pvscan
PV /dev/sda8 VG vgvz lvm2 [9.32 GB / 0 free]
PV /dev/sda7 VG vgmix lvm2 [18.63 GB / 2.63 GB free]
PV /dev/sda5 VG vgfc lvm2 [18.63 GB / 344.00 MB free]
Total: 3 [46.59 GB] / in use: 3 [46.59 GB] / in no VG: 0 [0 ]
[root@archlive ~]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "vgvz" using metadata type lvm2
Found volume group "vgmix" using metadata type lvm2
Found volume group "vgfc" using metadata type lvm2
[root@archlive ~]# lvs
/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failure to communicate with kernel device-mapper driver.
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv_depot vgfc -wi--- 9.80G
lv_home vgfc -wi--- 256.00M
lv_opt vgfc -wi--- 512.00M
lv_root vgfc -wi--- 1.00G
lv_tmp vgfc -wi--- 512.00M
lv_usr vgfc -wi--- 5.00G
lv_usr_local vgfc -wi--- 256.00M
lv_var vgfc -wi--- 1.00G
lv_iso vgmix -wi--- 6.00G
lv_store vgmix -wi--- 1.00G
lv_xubuntu vgmix -wi--- 5.00G
lv_zenwalk vgmix -wi--- 4.00G
lv_iso vgvz -wi--- 9.32G
[root@archlive ~]# lsmod
Module Size Used by
nls_cp437 5888 1
vfat 10880 1
fat 45984 1 vfat
usb_storage 84800 1
ext3 124040 0
jbd 44052 1 ext3
mbcache 7172 1 ext3
snd_seq_oss 30336 0
parport_pc 34884 1
snd_seq_midi_event 6656 1 snd_seq_oss
snd_seq 48432 4 snd_seq_oss,snd_seq_midi_event
pcmcia 33068 0
snd_seq_device 6796 2 snd_seq_oss,snd_seq
snd_intel8x0m 13964 0
snd_intel8x0 29084 0
joydev 10048 0
ppdev 7556 0
snd_ac97_codec 97828 2 snd_intel8x0m,snd_intel8x0
8139cp 19328 0
snd_pcm_oss 38656 0
snd_mixer_oss 14848 1 snd_pcm_oss
ac97_bus 2048 1 snd_ac97_codec
snd_pcm 68228 4 snd_intel8x0m,snd_intel8x0,snd_ac97_codec,snd_pcm_oss
8139too 22784 0
yenta_socket 23436 2
rsrc_nonstatic 11264 1 yenta_socket
pcmcia_core 33172 3 pcmcia,yenta_socket,rsrc_nonstatic
snd_timer 19848 2 snd_seq,snd_pcm
mii 4992 2 8139cp,8139too
psmouse 36880 0
lp 9444 0
parport 31596 3 parport_pc,ppdev,lp
pcspkr 2816 0
serio_raw 5508 0
snd 46628 10 snd_seq_oss,snd_seq,snd_seq_device,snd_intel8x0m,snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore 6496 1 snd
snd_page_alloc 8072 3 snd_intel8x0m,snd_intel8x0,snd_pcm
i2c_i801 9232 0
i2c_core 19348 1 i2c_i801
shpchp 29460 0
pci_hotplug 26276 1 shpchp
container 3712 0
video 16656 0
output 3200 1 video
intel_agp 23740 1
agpgart 28244 1 intel_agp
sg 27188 0
evdev 9472 0
thermal 15260 0
processor 32096 2 thermal
fan 4356 0
button 6416 0
battery 10372 0
ac 4484 0
rtc_cmos 9120 0
rtc_core 15516 1 rtc_cmos
rtc_lib 2944 1 rtc_core
loop 14212 4
unionfs 70756 1
squashfs 40968 2
isofs 32036 1
zlib_inflate 18560 2 squashfs,isofs
sr_mod 15300 1
cdrom 33952 1 sr_mod
sd_mod 23320 2
pata_acpi 4992 0
ata_generic 5636 0
ata_piix 17668 1
libata 142096 3 pata_acpi,ata_generic,ata_piix
ehci_hcd 33804 0
uhci_hcd 22288 0
scsi_mod 92204 5 usb_storage,sg,sr_mod,sd_mod,libata
dock 7952 1 libata
usbcore 129776 4 usb_storage,ehci_hcd,uhci_hcd
[root@archlive ~]# mkdir -p /mnt/tmp{1,2,3,4,5}
[root@archlive ~]# mount /dev/vgmix/lv_iso /mnt/tmp1
mount: you must specify the filesystem type
[root@archlive ~]# ^Gset -o vi
[root@archlive ~]# mount /dev/vgmix/lv_iso /mnt/tmp1
mount: special device /dev/vgmix/lv_iso does not exist
[root@archlive ~]# find /lib/modules/$(uname -r) -type f -name dm\*
/lib/modules/2.6.25-ARCH/kernel/drivers/hwmon/dme1737.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-crypt.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-delay.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-emc.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-hp-sw.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-mirror.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-mod.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-multipath.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-rdac.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-round-robin.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-snapshot.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/md/dm-zero.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/net/tulip/dmfe.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/net/usb/dm9601.ko
/lib/modules/2.6.25-ARCH/kernel/drivers/scsi/dmx3191d.ko
[root@archlive ~]# lvscan
/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failure to communicate with kernel device-mapper driver.Offline
#2 2008-08-30 14:43:21
- tomk
- Forum Fellow
- From: Ireland
- Registered: 2004-07-21
- Posts: 9,839
Re: Arch Install Image lacks LVM Support?
modprobe dm-mod is all you need. I installed my lvm system from the 2008.06 iso with no problems. See the lvm page in our wiki for more details.
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#3 2008-08-30 15:40:59
- archIbald
- Member
- Registered: 2008-08-29
- Posts: 8
Re: Arch Install Image lacks LVM Support?
Hi tomk,
really? I thought I tried this (but I may well haven't?)
Anyway, meanwhile I downloaded the FTP Arch Image 2008.03
and there LVM support worked fine,
so that I could prepare my install target.
But then I stepped into another trap.
After having configured my NIC I first tried to select a mirror FTP server to fetch the packages.
In the end I must have tried them all to no avail.
On the console F5 I could see that the anonymous login to every FTP server worked well
but they all ended in not being able to retrieve the package list.
It always said "Cannot find packages.txt".
Have they relocated the packages.txt file to some other dir on the FTP mirrors?
I also tried the quickinstall after setup hadn't worked.
But this time I restricted my futile attempts to a not too far away FTP mirror,
viz. tu-chemnitz.
Anyway, the outcome was the same.
Do you think it will work better with fetching packages.txt from running install from 2008.06 image?
(provided the modprobe dm-mod will create the device files this time)
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#4 2008-08-30 16:14:21
- archIbald
- Member
- Registered: 2008-08-29
- Posts: 8
Re: Arch Install Image lacks LVM Support?
Hi again tomk,
I have to apologize for my totally unfounded rant that started this thread.
You were absolutely right. Once I loaded dm-mod I had full LVM support on 2008.06 likewise.
It was even less typing because one could omit the every LVM command preceding lvm
as opposed to 2008.03.
But here I still had trouble fetching the packages from quickinst while setup must have successfully
fetched packages.txt because it continued to offer category menus, where I aborted for now.
I would however prefer using quickinst because I already mounted /boot and the LVs for / and /var
from my USB flash drive.
I cannot recall whether setup would allow only for specifying mount points but skipping FS creation.
I will come back later...
Last edited by archIbald (2008-08-30 16:14:52)
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