Martin Sivák has submitted this change and it was merged. Change subject: Add metadata storage support for raw block device ...................................................................... Add metadata storage support for raw block device This adds support for using raw partition or drive as the metadata storage device. It implements partitioning schema to support multiple metadata files and also allows for future extension. Once the backend is connected to, it uses device mapper interface to create the devices for all registered metadata files. The underlying block device uses the following block based structure. The first block on the device is meta block. Each meta block (512B) contains: 4B signature (HEs0) 8B index of next meta block or 0 if this is the last one 64 bytes with service name (first byte equals the used length) 8B + 8B pointers to data section (start block, length) ... more data sections if needed 16B of 0 acting as a sentinel 4B CRC32 checksum If there is need to use lots of data sections for a single service, is is possible tp use the service name multiple times and the data blocks will be concatenated using device mapper. Change-Id: Id6ab21fb2075fc59b444b5754ade8a1569b83b18 Signed-off-by: Martin Sivak <msivak(a)redhat.com&gt; --- M ovirt_hosted_engine_ha/lib/storage_backends.py M ovirt_hosted_engine_ha/lib/storage_backends_test.py 2 files changed, 511 insertions(+), 0 deletions(-) Approvals: Martin Sivák: Verified; Looks good to me, approved Greg Padgett: Looks good to me, but someone else must approve -- To view, visit http://gerrit.ovirt.org/25798 To unsubscribe, visit http://gerrit.ovirt.org/settings Gerrit-MessageType: merged Gerrit-Change-Id: Id6ab21fb2075fc59b444b5754ade8a1569b83b18 Gerrit-PatchSet: 15 Gerrit-Project: ovirt-hosted-engine-ha Gerrit-Branch: master Gerrit-Owner: Martin Sivák <msivak(a)redhat.com&gt; Gerrit-Reviewer: Doron Fediuck <dfediuck(a)redhat.com&gt; Gerrit-Reviewer: Greg Padgett <gpadgett(a)redhat.com&gt; Gerrit-Reviewer: Jiří Moskovčák <jmoskovc(a)redhat.com&gt; Gerrit-Reviewer: Martin Sivák <msivak(a)redhat.com&gt; Gerrit-Reviewer: Sandro Bonazzola <sbonazzo(a)redhat.com&gt; Gerrit-Reviewer: automation(a)ovirt.org Gerrit-Reviewer: oVirt Jenkins CI Server