[linux-lvm] Re: GRUB + LVM + XFS?

[linux-lvm] Re: GRUB + LVM + XFS?

[Adrian Head]

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On Tue, 8 Jan 2002 05:54, Rupa Schomaker wrote:
> I'm having toubles with the current CVS version of the XFS kernel.  I
> haven't had time to look at it completely, but... it could be:
>
> 1) mismatch between userspace and kernel (what LVM is in the XFS
>    kernel?  I'm using the debian lvm10 userspace).
>
> 2) bad config
>
> 3) ???
>
> A quick "bt" at boot in kdb shows that devfs is in the call path.  No,
> I haven't had time to write everything down. :(  Man, I wish there was
> an easy to dump the kdb info or an OOPs to disk...

Well all I do is for getting kdb output is to use a serial console and 
another computer - then cut and past then send  ;-).

It is very interesting that devfs is referenced - there was a LVM memory 
corruption problem and a patch for LVM/devfs - it can be found here:
http://marc.theaimsgroup.com/?l=linux-xfs&m=101031443221058&w=2

- From my experience it seems that LVM 1.0.1rc4(ish) is way more robust than 
the updated LVM 1.0.1 or even CVS LVM 1.0.1 yesterday.  However, not 
everything works as expected with either. You can find a results table for a 
few tests I have conducted here: (of course YMMV)
http://marc.theaimsgroup.com/?l=linux-lvm&m=100994364215110&w=2

I think you would be very interested in the discussions and activity that has 
been occuring on the linux-xfs & linux-lvm lists at the moment regarding XFS 
and LVM.  If you are seeing problems I would be very interested in finding 
out how your problems differ from mine.

- -- 
Adrian Head

(Public Key available on request.)
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[linux-lvm] Re: GRUB + LVM + XFS?

[Adrian Head]

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On Tue, 8 Jan 2002 05:54, Rupa Schomaker wrote:
> I'm having toubles with the current CVS version of the XFS kernel.  I
> haven't had time to look at it completely, but... it could be:
>
> 1) mismatch between userspace and kernel (what LVM is in the XFS
>    kernel?  I'm using the debian lvm10 userspace).
>
> 2) bad config
>
> 3) ???
>
> A quick "bt" at boot in kdb shows that devfs is in the call path.  No,
> I haven't had time to write everything down. :(  Man, I wish there was
> an easy to dump the kdb info or an OOPs to disk...

Well all I do is for getting kdb output is to use a serial console and 
another computer - then cut and past then send  ;-).

It is very interesting that devfs is referenced - there was a LVM memory 
corruption problem and a patch for LVM/devfs - it can be found here:
http://marc.theaimsgroup.com/?l=linux-xfs&m=101031443221058&w=2

- From my experience it seems that LVM 1.0.1rc4(ish) is way more robust than 
the updated LVM 1.0.1 or even CVS LVM 1.0.1 yesterday.  However, not 
everything works as expected with either. You can find a results table for a 
few tests I have conducted here: (of course YMMV)
http://marc.theaimsgroup.com/?l=linux-lvm&m=100994364215110&w=2

I think you would be very interested in the discussions and activity that has 
been occuring on the linux-xfs & linux-lvm lists at the moment regarding XFS 
and LVM.  If you are seeing problems I would be very interested in finding 
out how your problems differ from mine.

- -- 
Adrian Head

(Public Key available on request.)
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Re: [linux-lvm] Re: GRUB + LVM + XFS?

[Eric M. Hopper]

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On Mon, 2002-01-07 at 18:48, Adrian Head wrote:
> Adrian Head
> 
> (Public Key available on request.)

So, what is it?  I'm tired of seeing the message about an unverifiable
signature.  :-)

Have fun (if at all possible),
-- 
The best we can hope for concerning the people at large is that they
be properly armed.  -- Alexander Hamilton
-- Eric Hopper (hopper@omnifarious.org 
http://www.omnifarious.org/~hopper) --

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Re: [linux-lvm] Re: GRUB + LVM + XFS?

[Heinz J . Mauelshagen]

On Tue, Jan 08, 2002 at 10:48:11AM +1000, Adrian Head wrote:
> On Tue, 8 Jan 2002 05:54, Rupa Schomaker wrote:
> > I'm having toubles with the current CVS version of the XFS kernel.  I
> > haven't had time to look at it completely, but... it could be:
> >
> > 1) mismatch between userspace and kernel (what LVM is in the XFS
> >    kernel?  I'm using the debian lvm10 userspace).
> >
> > 2) bad config
> >
> > 3) ???
> >
> > A quick "bt" at boot in kdb shows that devfs is in the call path.  No,
> > I haven't had time to write everything down. :(  Man, I wish there was
> > an easy to dump the kdb info or an OOPs to disk...
> 
> Well all I do is for getting kdb output is to use a serial console and 
> another computer - then cut and past then send  ;-).
> 
> It is very interesting that devfs is referenced - there was a LVM memory 
> corruption problem and a patch for LVM/devfs - it can be found here:
> http://marc.theaimsgroup.com/?l=linux-xfs&m=101031443221058&w=2
> 
> From my experience it seems that LVM 1.0.1rc4(ish) is way more robust than 
> the updated LVM 1.0.1 or even CVS LVM 1.0.1 yesterday.

Do you have some input which particular changes cause it?
Thanks.

> However, not 
> everything works as expected with either. You can find a results table for a 
> few tests I have conducted here: (of course YMMV)
> http://marc.theaimsgroup.com/?l=linux-lvm&m=100994364215110&w=2
> 
> I think you would be very interested in the discussions and activity that has 
> been occuring on the linux-xfs & linux-lvm lists at the moment regarding XFS 
> and LVM.  If you are seeing problems I would be very interested in finding 
> out how your problems differ from mine.
> 
> -- 
> Adrian Head
> 
> (Public Key available on request.)
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] Re: GRUB + LVM + XFS?

[Adrian Head]

On Wed, 16 Jan 2002 00:18, Heinz J . Mauelshagen wrote:
> > From my experience it seems that LVM 1.0.1rc4(ish) is way more robust
> > than the updated LVM 1.0.1 or even CVS LVM 1.0.1 yesterday.
>
> Do you have some input which particular changes cause it?
> Thanks.
>
The issue was that when I tried to create an XFS snapshot it would Oops and 
the snapshot creation would not have been completed.  The /dev/vg/lv entries 
would not be there; however, vgdisplay would show the snapshot as being in 
use but I could not remove the incomplete snapshot.

When I would reboot using a lvm-1.0.1 kernel (2.4.17-xfs+lvm1.0.1) - the 
machine would hang during startup; however, if I used a lvm-1.0.1rc4(ish) 
kernel (2.4.16-xfs+lvm1.0.1rc4) it would fix the problem on the fly during 
bootup and the snapshot would be put in full operation without problems.  
This was the only way I found to get the machine up & running again.

I don't have any info on which lines of code might have been the cause.  I'm 
still learning how to dig in and dbug.  ;-)

-- 
Adrian Head

(Public Key available on request.)

Re: [linux-lvm] Re: GRUB + LVM + XFS?

[Patrick Caulfield]

On Wed, Jan 16, 2002 at 01:16:15AM +1000, Adrian Head wrote:
> The issue was that when I tried to create an XFS snapshot it would Oops and 
> the snapshot creation would not have been completed.  The /dev/vg/lv entries 
> would not be there; however, vgdisplay would show the snapshot as being in 
> use but I could not remove the incomplete snapshot.
> 
> When I would reboot using a lvm-1.0.1 kernel (2.4.17-xfs+lvm1.0.1) - the 
> machine would hang during startup; however, if I used a lvm-1.0.1rc4(ish) 
> kernel (2.4.16-xfs+lvm1.0.1rc4) it would fix the problem on the fly during 
> bootup and the snapshot would be put in full operation without problems.  
> This was the only way I found to get the machine up & running again.
> 
> I don't have any info on which lines of code might have been the cause.  I'm 
> still learning how to dig in and dbug.  ;-)

Looking at other threads in this list I think the issues are XFS related. I have
tried the latest XFS patches from

ftp://oss.sgi.com/projects/xfs/download/patches/2.4.17/

and the snapshots seem OK to me (that's without the VFS lock patch which XFS
doesn't seem to need anyway).

patrick

Re: [linux-lvm] Re: GRUB + LVM + XFS?

[Adrian Head]

On Wed, 16 Jan 2002 01:35, Patrick Caulfield wrote:
> Looking at other threads in this list I think the issues are XFS related. I
> have tried the latest XFS patches from
>
> ftp://oss.sgi.com/projects/xfs/download/patches/2.4.17/
>
> and the snapshots seem OK to me (that's without the VFS lock patch which
> XFS doesn't seem to need anyway).
>
> patrick

The actual fix was worked out by Eric of SGI by comparing the Linus tree with 
the LVM code (I hope I have this correct) and it modifies lvm-snap.c - at 
least appears to be an interaction problem.  The weird thing is that this 
fixes the problem if I run my LVM tests by hand - if I use a script it still 
fails.

--- lvm-snap.c	Wed Jan  9 16:10:01 2002
+++ /localhome/eric/lvm-1.0.1-works/lvm-snap.c	Wed Jan  9 16:07:52 2002

http://marc.theaimsgroup.com/?l=linux-xfs&m=101061519711939&w=2

-- 
Adrian Head

(Public Key available on request.)

Re: [linux-lvm] Re: GRUB + LVM + XFS?

[Adrian Head]

On Wed, 16 Jan 2002 01:35, Patrick Caulfield wrote:
> Looking at other threads in this list I think the issues are XFS related. I
> have tried the latest XFS patches from
>
> ftp://oss.sgi.com/projects/xfs/download/patches/2.4.17/
>
> and the snapshots seem OK to me (that's without the VFS lock patch which
> XFS doesn't seem to need anyway).

The original issue was getting ext3, resierfs & XFS coexisting.  I ran tests 
with almost all possible combinations of 2.4.17-xfs & lvm-1.0.1rc4 / 
lvm-1.0.1 CVS.  It would always be that one filesystem was fine but others 
would fail etc...

-- 
Adrian Head

(Public Key available on request.)

Re: [linux-lvm] Re: GRUB + LVM + XFS?

[Adrian Head]

To everyone on the lists I appologise and will refrain from using a signature 
in the future when posting to the lists.

On Tue, 8 Jan 2002 21:44, Eric M. Hopper wrote:
> On Mon, 2002-01-07 at 18:48, Adrian Head wrote:
> > Adrian Head
> >
> > (Public Key available on request.)
>
> So, what is it?  I'm tired of seeing the message about an unverifiable
> signature.  :-)
>
> Have fun (if at all possible),

-- 
Adrian Head

(Public Key available on request.)