[DRBD-user] Problems with applications on top of DRBD locking up, becoming defunct

Lavender, Ben ben.lavender at mcdean-europe.com
Thu Aug 30 10:29:06 CEST 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

The co'd branch doesn't build for me on a machine that can build the
8.0.5 tgz.  

Make works, but after removing the rpms from 8.0.5 and removing the
module, whatever make install did seems to have lost them.  I'd be more
comfortable with make rpm, since I can then more easily play with
versions; do I need to be adding something to the svn to let 'make rpm'

I'm trying to verify if my kernel version uses the newer version of
generic_make_request and I'm 90% sure it does not.


> -----Original Message-----
> From: drbd-user-bounces at lists.linbit.com [mailto:drbd-user-
> bounces at lists.linbit.com] On Behalf Of Lars Ellenberg
> Sent: Wednesday, August 29, 2007 11:53 PM
> To: drbd-user at lists.linbit.com
> Subject: Re: [DRBD-user] Problems with applications on top of DRBD
> up,becoming defunct
> On Wed, Aug 29, 2007 at 07:30:51PM +0200, Lavender, Ben wrote:
> > I'm working on getting a few DRBD servers up and running, but I'm
> > a ton of trouble with it.  I've set up DRBD/heartbeat on some
> > servers before with no problems, but this current batch is behaving
> > strangely with no error messages reported anywhere.
> >
> > Basically, any application (so far pound, nfsd, mysql, and ldap,
> > with a number of filesystem tools) will eventually lock up while
> > with the mounted drbd volume.  It can happen with something as
simple as
> > 'ls', or 'touch'.  After whatever process locks up, the drbd volume
> > considered busy and can't be released without fencing it.  After a
> > reboot, this happens in less than 3 hours.  Killing whatever process
> > having the problem will do nothing without -9; with -9 they will
> > sometimes become defunct and sometimes do nothing.
> >
> > /proc/drbd shows nothing unusual.  This is an example after my
> > two drbd volumes have locked up, but I managed to unmount and
> > one of them.  The second one is locked with mysql and the third with
> > umount.
> >
> >
> >
> > [root at backend1 ben]# cat /proc/drbd
> >
> > version: 8.0.5 (api:86/proto:86)
> ....
> > These are the same machines that prompted my 'WFBitMapT and
> > message from earlier this week which has not seen a response,
> > Dell 2950's with hardware RAID (Perc5's on the megaraid driver),
> > RHEL5, SELinux enabled.  The DRBD volumes live on top of LVM
> > Kernel is 2.6.18-8.1.8, DRBD is 8.0.5, all mentioned software is
> > the CentOS5 or RHEL5 version of the particular package.
> your working installations use a different kernel, I assume?
> with this particulare kernel it locks up?
> vendor kernels are known to backport or introduce things early.
> it may well be the same problem that shows in kernel.org 2.6.22 and
> a lockup in recursive generic_make_request.
> please try again with a recent checkout of drbd from
>  svn co http://svn.drbd.org/drbd/branches/drbd-8.0
> --
> : Lars Ellenberg                            Tel +43-1-8178292-0  :
> : LINBIT Information Technologies GmbH      Fax +43-1-8178292-82 :
> : Vivenotgasse 48, A-1120 Vienna/Europe    http://www.linbit.com :
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