On 20.04.2019 14:38, a...@sysgo.com wrote: >> On 13 March 2019 at 11:47 Roland Kammerer <roland.kamme...@linbit.com> wrote: >> >> >> On Tue, Mar 12, 2019 at 09:08:42AM +0100, Armin Schindler wrote: >>> On 3/11/19 1:42 PM, Roland Kammerer wrote: >>>> On Mon, Mar 11, 2019 at 11:13:11AM +0100, Armin Schindler wrote: >>>>> 2 hosts Debian 9 (stretch) with default DRBD version 8.4.7. >>>> >>>> Please retry with the current 8.4.11 version of DRBD. You can it from >>>> here: >>>> https://www.linbit.com/en/drbd-community/drbd-download/ >>> >>> Okay, thanks. I will test 8.4.11. >>> >>> Do I need to change/update the tools as well or just the kernel driver? >>> I currently use drbd-utils 8.9.10. >> >> They should be fine. I don't remember any non-corner cases fixes for 8.4 >> in drbd-utils. > > I tried version 8.4.11 and the problem persists. > When using Qemu/KVM virtio disk with a caching mode that uses host page cache, > or when using just a filesystem like ext4 on (without Qemu/KVM) on the host, > the > drbd device gets out of sync after a while.
To correct my statement above, the out-of-sync happens when using KVM/Qemu with a cache mode that is NOT using page cache (like option "none"). When using option like "writethrough" which uses host page cache, no out-of-sync happens. When using the drbd device as mounted-on-host with e.g. ext4, out-of-sync happens as well. Armin > The drbd device is on top of a LVM-lv on both nodes. > > Is there anything else I can test? > According to some (old) posts, this is a known issue for a long time now. But > I never > found any resolution or fix. > > Thanks. > Armin
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