Re: Having duplicate PV problems, think there's a bug in LVM2 md component detection

"Ron Watkins" <linux-lvm@malor.com> · Mon, 28 Feb 2005 17:29:11 -0500

Due to another failing hard drive, I was forced to just use the md0 device 
directly and put it into use.  Once I have the dying drive replaced, I might 
be able to clear the data off again if you want to do a specific set of 
tests, but that would take many hours.  (150+ gigs over Fast Ethernet, not a 
quick process).  So please be sure you need me to do this, if you do.

I am using LVM version 2.01.04 (2005-02-09).  The Library Version is 
1.01.00-ioctl (2005-01-17).  The Driver Version is 4.1.0.  (no date given). 
I don't have any easy way to determine if the Debian maintainer is patching 
this.  Should I be submitting the bug report directly to him/her/them 
instead?

I'm not sure how to strace... I see the strace command. I assume I'd have to 
strace the pvcreate and pvdisplay, meaning I'd need to move my data again 
first.   If you do want me to do this, I can start copying data off late 
tomorrow, and can probably do the actual test on Wednesday.   I'll need the 
exact command line you want used, however, since I don't know anything about 
strace.

<<RON>>

jeeves:~# lvm version
 LVM version:     2.01.04 (2005-02-09)
 Library version: 1.01.00-ioctl (2005-01-17)
 Driver version:  4.1.0

----- Original Message ----- 
From: "Luca Berra" <bluca@comedia.it>

To: "LVM general discussion and development" <linux-lvm@redhat.com>

Sent: Monday, February 28, 2005 4:38 PM

Subject: Re:  Having duplicate PV problems,think there's a bug in 
LVM2 md component detection

On Mon, Feb 28, 2005 at 03:39:59PM -0500, Ron Watkins wrote:
Yes, I have two PVs with the same UUID.  The problem is that these PVs are 
COMPONENTS OF an MD device.  So when pvcreate writes its superblock to 
md0, it gets mirrored onto all the components of md0.  Later runs elicit 
much complaining because /dev/hda and several /dev/sd devices now have the 
'same' UUID.   They're SUPPOSED to, they're components of a RAID.

LVM is supposed to detect this situation and not do that, but it doesn't 
seem to be working for me.

i wonder if it is a problem with largefile access ?!?
which version of lvm2 are you using?
does debian patch it?
can you try stracing it an look for seeks, so we can see if it is
wrapping around somewhere?

L.

--
Luca Berra -- bluca@comedia.it
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