[linux-lvm] kernel hang

[linux-lvm] kernel hang

[Jan Niehusmann]

Is there something wrong with doing 
while true; do dd if=/dev/zero of=/dev/vg1/test; done
and
lvextend -L+90M /dev/vg1/test

at the same time?

It caused a system hang (no messages, no log) on linux-2.4.0-test12-pre3
(with ext2 online resize patches, but there obviously was no filesystem 
on the volume)

Jan


PS: Andreas, perhaps the errors I saw were not ext2 related. Maybe the 
kernel doesn't like writing to the device and resizing it at the same time?

Re: [linux-lvm] kernel hang

[Heinz J. Mauelshagen]

On Fri, Dec 01, 2000 at 02:00:29AM +0100, Jan Niehusmann wrote:
> 
> Is there something wrong with doing 
> while true; do dd if=/dev/zero of=/dev/vg1/test; done
> and
> lvextend -L+90M /dev/vg1/test
> 
> at the same time?

No.
The extension of the LV is done in an atomic way.

> 
> It caused a system hang (no messages, no log) on linux-2.4.0-test12-pre3
> (with ext2 online resize patches, but there obviously was no filesystem 
> on the volume)

Did you experience other heavy load hangs in general?

> 
> Jan
> 
> 
> PS: Andreas, perhaps the errors I saw were not ext2 related. Maybe the 
> kernel doesn't like writing to the device and resizing it at the same time?
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm

-- 

Regards,
Heinz      -- The LVM guy --

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

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Bartningstr. 12
                                                  64289 Darmstadt
                                                  Germany
Mauelshagen@Sistina.com                           +49 6151 7103 86
                                                       FAX 7103 96
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] kernel hang

[Jan Niehusmann]

On Sun, Dec 03, 2000 at 02:25:54PM +0000, Heinz J. Mauelshagen wrote:
> Did you experience other heavy load hangs in general?

no, none. Neither processor nor i/o load like heavy swapping cause any
problems. 
In fact, this was the first complete hangup for months. 

Jan

Re: [linux-lvm] kernel hang

[Heinz J. Mauelshagen]

On Mon, Dec 04, 2000 at 09:39:22PM +0100, Jan Niehusmann wrote:
> On Sun, Dec 03, 2000 at 02:25:54PM +0000, Heinz J. Mauelshagen wrote:
> > Did you experience other heavy load hangs in general?
> 
> no, none. Neither processor nor i/o load like heavy swapping cause any
> problems. 
> In fact, this was the first complete hangup for months. 

Is it reproducable then?

> 
> Jan

-- 

Regards,
Heinz      -- The LVM guy --

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

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Bartningstr. 12
                                                  64289 Darmstadt
                                                  Germany
Mauelshagen@Sistina.com                           +49 6151 7103 86
                                                       FAX 7103 96
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] kernel hang

[Jan Niehusmann]

On Tue, Dec 05, 2000 at 01:09:36AM +0000, Heinz J. Mauelshagen wrote:
> On Mon, Dec 04, 2000 at 09:39:22PM +0100, Jan Niehusmann wrote:
> > In fact, this was the first complete hangup for months. 
> 
> Is it reproducable then?

I didn't try: There is some important data on the vg so I don't like the idea
of linux crashing while changing the vg metadata.

Jan