All,
I've been using LVM1 for over a year now and throught I'd try the latest
LVM2 offering as well as experiment with software raid.
I have a freshly installed Slackware 9.0 installed on a test machine. I've
patched a clean linux-2.4.20 kernel with the patches from lvmlvm_1.0.7.tar.gz
and device-mapper.1.00.02.tgz, in that order. The patches apply without any
rejects. The kernel builds and boots without and problem (I have md, lvm
and dm all built as modules so that I can load/unload as needed).
I've also built and installed lvm_1.0.7.tar.gz tools, device-mapper.1.00.02.tgz
tools and LVM2.2.00.05.tgz tools, in that order. Yes, I realize that the
LVM2 tools will overlay the LVM1 tools.
I've create a very simple raid-5 raid using 3 1Gb disks (this is just a
test, after all). The raid was initialized using mkraid as /dev/md0. I can
mke2fs on it and mount it without any problems.
I created the device mapper control device as instructed, and I can create
a dm device /dev/mapper/vd0 using dmsetup. I can mke2fs on it and mount it
without any problems as well. Good, the dm code is working. I remove
the dm device using dmsetup, because I want to use the raid device directly.
Also, I can use the LVM 1 tools to create an vg named uservg on /dev/md0,
I can then create an lv named worklv, format it and mount it with no
problems as well.
So far, so good. I remove the lv, vg (deactivate it first) and clear the
first 1024 blocks of /dev/md0. I also remove all the lvm info from /etc,
and unload the lvm-mod module. System should be clean as var as LVM
data goes.
Now for LVM2. I installed the LVM2 tools, rebooted.
I do a vgscan, it identifies the raid device in the /etc/lvm/.cache
file. I can then use pvcreate on it and display it as well, but when
I create a vg over the pv, it says it's been created, but it can't
display it and the pv is no longer found. Also the uservg device in /dev
never gets created:
# lvm
lvm> pvcreate /dev/md0
No physical volume label read from /dev/md0
Physical volume "/dev/md0" successfully created
lvm> pvs
PV VG Fmt Attr PSize PFree
/dev/md0 lvm2 -- 1.96G 1.96G
lvm> pvdisplay /dev/md0
--- NEW Physical volume ---
PV Name /dev/md0
VG Name
PV Size 1.96 GB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID gr4KFN-otL6-W3KM-DwAx-0WrO-4YLY-jCSEaI
lvm> vgcreate -v -A y -l 10 -p 10 -s 32M uservg /dev/md0
Adding physical volume '/dev/md0' to volume group 'uservg'
Archiving volume group "uservg" metadata.
Creating volume group backup "/etc/lvm/backup/uservg"
Volume group "uservg" successfully created
lvm> vgdisplay uservg
Couldn't find device with uuid 'gr4KFN-otL6-W3KM-DwAx-0WrO-4YLY-jCSEaI'.
Couldn't find all physical volumes for volume group uservg.
Volume group "uservg" doesn't exist
lvm> pvdisplay /dev/md0
No physical volume label read from /dev/md0
Failed to read physical volume "/dev/md0"
lvm> pvs
Couldn't find device with uuid 'gr4KFN-otL6-W3KM-DwAx-0WrO-4YLY-jCSEaI'.
Couldn't find device with uuid 'gr4KFN-otL6-W3KM-DwAx-0WrO-4YLY-jCSEaI'.
Couldn't find all physical volumes for volume group uservg.
Can't read uservg: skipping
lvm>
I've also tried a scenario where I do a pvcreate, then try and do a pvchange
and get a seg-fault (gdb shows it dies in pv_write()).
Any thoughts on how to solve this? Everything builds without any errors.
I must be doing something wrong, but I just don't know what.
--
Peter A. Castro <doctor@fruitbat.org> or <Peter.Castro@oracle.com>
"Cats are just autistic Dogs" -- Dr. Tony Attwood
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