[linux-lvm] Having duplicate PV problems, think there's a bug in LVM2 md component detection
Ron Watkins
linux-lvm at malor.com
Mon Feb 28 22:29:11 UTC 2005
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 at comedia.it>
To: "LVM general discussion and development" <linux-lvm at redhat.com>
Sent: Monday, February 28, 2005 4:38 PM
Subject: Re: [linux-lvm] 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.
>
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