Martin Sivák has submitted this change and it was merged. Change subject: Use SYNC DIRECT IO everywhere to make sure all hosts see the same data ...................................................................... Use SYNC DIRECT IO everywhere to make sure all hosts see the same data We did remove direct io for LVM based backends as Python did not supported that properly (http://bugs.python.org/issue5396). The issue with direct io is that it requires page aligned buffers for writes and reads. Python can't ensure that. This patch uses a very nice workaround from http://www.alexonlinux.com/direct-io-in-python that proposed to use mmap to get the buffer. MMAPped memory is page aligned and Python can use it for reads and writes. Change-Id: I31912300b27a2ae215e2462114012676b43cb017 Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1277079 Signed-off-by: Martin Sivak <msivak(a)redhat.com&gt; --- M ovirt_hosted_engine_ha/broker/storage_broker.py M ovirt_hosted_engine_ha/lib/storage_backends.py M ovirt_hosted_engine_ha/lib/util.py 3 files changed, 67 insertions(+), 25 deletions(-) Approvals: Sandro Bonazzola: Looks good to me, but someone else must approve Martin Sivák: Verified; Looks good to me, approved; Passed CI tests -- To view, visit https://gerrit.ovirt.org/48073 To unsubscribe, visit https://gerrit.ovirt.org/settings Gerrit-MessageType: merged Gerrit-Change-Id: I31912300b27a2ae215e2462114012676b43cb017 Gerrit-PatchSet: 9 Gerrit-Project: ovirt-hosted-engine-ha Gerrit-Branch: master Gerrit-Owner: Martin Sivák <msivak(a)redhat.com&gt; Gerrit-Reviewer: Adam Litke <alitke(a)redhat.com&gt; Gerrit-Reviewer: Allon Mureinik <amureini(a)redhat.com&gt; Gerrit-Reviewer: Federico Simoncelli <fsimonce(a)redhat.com&gt; Gerrit-Reviewer: Jenkins CI Gerrit-Reviewer: Martin Sivák <msivak(a)redhat.com&gt; Gerrit-Reviewer: Nir Soffer <nsoffer(a)redhat.com&gt; Gerrit-Reviewer: Roy Golan <rgolan(a)redhat.com&gt; Gerrit-Reviewer: Sandro Bonazzola <sbonazzo(a)redhat.com&gt; Gerrit-Reviewer: Simone Tiraboschi <stirabos(a)redhat.com&gt; Gerrit-Reviewer: Tal Nisan <tnisan(a)redhat.com&gt; Gerrit-Reviewer: gerrit-hooks <automation(a)ovirt.org&gt;