[DRBD-user] [DRBD-9.0.15-0rc1] Resource "stuck" during live migration

[Yannis Milios]

I've switched pve1,pve2 to lvm thin recently just for testing and left pve3
with zfs as a storage back end. However, I really miss some cool zfs
features, compared to lvm thin, like on-the-fly compression of zero blocks
and its fast,low cost, point in time snapshots... What I don't miss though,
is zfs memory consumtion compared to lvm thin :-)

On Thu, Jul 26, 2018 at 8:26 AM Roland Kammerer <roland.kammerer at linbit.com>
wrote:

> On Wed, Jul 25, 2018 at 08:49:02PM +0100, Yannis Milios wrote:
> > Hello,
> >
> > Currently testing 9.0.15-0rc1 on a 3 node PVE cluster.
> >
> > Pkg versions:
> > ------------------
> > cat /proc/drbd
> > version: 9.0.15-0rc1 (api:2/proto:86-114)
> > GIT-hash: fc844fc366933c60f7303694ca1dea734dcb39bb build by root at pve1,
> > 2018-07-23 18:47:08
> > Transports (api:16): tcp (9.0.15-0rc1)
> > ii  python-drbdmanage             0.99.18-1
> > ii  drbdmanage-proxmox            2.2-1
> > ii  drbd-utils                    9.5.0-1
> > ---------------------
> > Resource=vm-122-disk-1
> > Replica count=3
> > PVE nodes=pve1,pve2,pve3
> > Resource is active on pve2 (Primary), the rest two nodes (pve1,pve2) are
> > Secondary.
> >
> > Tried to live migrate the VM from pve2 to pve3 and the process stuck just
> > before starting. By inspecting dmesg on both nodes (pve2,pve3), I get the
> > following crash..
> >
> >
> > pve2 (Primary) node:
> >
> https://privatebin.net/?fb5435a42b431af2#4xZpd9D5bYnB000+H3K0noZmkX20fTwGSziv5oO/Zlg=
> >
> > pve3(Secondary)node:
> >
> https://privatebin.net/?d3b1638fecb6728f#2StXbwDPT0JlFUKf686RJiR+4hl52jEmmij2UTtnSjs=
> >
>
> We will look into it closer. For now I saw "zfs" in the second trace and
> stopped. It is so freaking broken, it is not funny any more (it craps
> out with all kinds of BS in our internal infrastructure as well). For
> example we had to go back to a xenial kernel because the bionic ones zfs
> is that broken :-/ </zfs rant, which I actually really like>
>
> Regards, rck
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