[linux-lvm] Procedure to pvmove PE's on bad media?

[linux-lvm] Procedure to pvmove PE's on bad media?

[Octavio Di Sciullo]

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Hi all,

	i know this issue has been adressed on previous threads,
but i havent been able to resolve my problem with the work
arounds or patches issued, so i will submit my problem here.

	First off, here's some info in my configuration :

	debian linux 2.4.2
	lvm 0.9 (as issued from packages lvm_0.9-2_i386.deb and
liblvm_0.9-2_i386.deb)
	e2fsprogs 1.19-3
	resize2fs 1.03-1

	i have 1 lvm LV (concat) set up on 3 drives (1xWD 25GB,
2xIBM 40GB). A while ago, the WD drive crashed and i had to
reinstall a system ( / was on it) and restore the lvm
configuration, which went about just fine. I managed to get
my VG & LV back, no trouble there. Now, the trouble is i
want to remove the WD drive from the lvm conf and not
surprisingly, i end up with 5 PE on the partition used by
lvm on this drive (hda3) completely unreadable, which pvmove
wont reallocate. Its definitely a read error, no problem
there, i get the whole package : funny noises from the
drive, i/o read errors from syslogd, and here's what pvmove
has to say about it when i try to move one of these PE:

willy:/var/tmp# pvmove -n lvol1:6023 /dev/hda3 /dev/hdc1
pvmove -- moving physical extents in active volume group
"vg01"
pvmove -- WARNING: moving of active logical volumes may
cause data loss!
pvmove -- do you want to continue? [y/n] y
pvmove -- ERROR reading input physical volume "/dev/hda3"

pvmove -- ERROR "pv_move_pe(): read input PV" pv_move_pe

pvmove -- ERROR "pv_move_pe(): read input PV" moving
physical extents


	I've tried to apply to pvmove (from lvm 0.9.1b7) the patch
issued on this thread :
http://lists.sistina.com/pipermail/linux-lvm/2001-September/008767.html
, but unfortunately, it doesnt work :/. With this "forced"
pvmove, i get an endless read loop :

"read:-1 to_read:512
read:-1 to_read:512
read:-1 to_read:512
read:-1 to_read:512"
..... (i let it run for about 4h and the output never
changed, nor as the drive never ceased to produce scary
noises)

	Now i dont really know if this the proper behavior of the
patched pvmove in case it REALLY doesnt manage to read the
data (i thought this was what the patch was for), or if i
have a compatibility problem with my 0.9 lvm installed and
the 0.9.1b7 patched pvmove.... I tried (a bit) to upgrade to
0.9.1b7 but i get dependency conflicts.

	Does anyone have any ideas on how to solve this, except for
dumping all data on a new LV built on new drives?

		Octavio

PS: i am, of course, available for any further info on my
configuration if it is required.
______________________________________________________
Boîte aux lettres - Caramail - http://www.caramail.com

Re: [linux-lvm] Procedure to pvmove PE's on bad media?

[Ragnar Kjørstad]

On Wed, Dec 26, 2001 at 12:49:49PM +0000, Octavio Di Sciullo wrote:
> 	I've tried to apply to pvmove (from lvm 0.9.1b7) the patch
> issued on this thread :
> http://lists.sistina.com/pipermail/linux-lvm/2001-September/008767.html
> , but unfortunately, it doesnt work :/. With this "forced"
> pvmove, i get an endless read loop :
> 
> "read:-1 to_read:512
> read:-1 to_read:512
> read:-1 to_read:512
> read:-1 to_read:512"
> ..... (i let it run for about 4h and the output never
> changed, nor as the drive never ceased to produce scary
> noises)
> 
> 	Now i dont really know if this the proper behavior of the
> patched pvmove in case it REALLY doesnt manage to read the
> data (i thought this was what the patch was for), or if i
> have a compatibility problem with my 0.9 lvm installed and
> the 0.9.1b7 patched pvmove.... I tried (a bit) to upgrade to
> 0.9.1b7 but i get dependency conflicts.


Did you run it as root?
(isn't -1==EPERM, meaning you have no permission?)

The proper output (I think) should be:
read:-5 to_read:512
and with 4MB extent-size you should have 8192 such messages pr bad
extent (max).



-- 
Ragnar Kjørstad
Big Storage