I'm testing oVirt 3.5.2 nightly with 1 host for engine, 2 for virt (v10,v11) and 2 for GlusterFS (s20,s21). The Master Data Domain (named DATA) rely on GlusterFS. I've added second Data Domain (named DATA_R3) in order to switch the Master role and remove the old one. Every time I try to put the old Data Domain in maintenance I got the following error: "Sync Error on Master Domain between Host v10 and oVirt Engine. Domain: DATA_R3 is marked as Master in oVirt Engine database but not on the Storage side. Please consult with Support on how to fix this issue." Same error if I try to put DATA in maintenance from the shell: # action storagedomain '62a034ca-63df-44f2-9a87-735ddd257a6b' deactivate --datacenter-identifier '00000002-0002-0002-0002-00000000022f' I cannot switch to the new Master Data Domain neither I can put the Data Center in maintenance. I'm not sure if it is related to bug 1183977. I've already upgraded to ovirt-engine-3.5.2-0.0.master.20150224122113.git410d88b.el6.noarch but the problem still happen. Thanks, -- Stefano Stagnaro Prisma Engineering S.r.l. Via Petrocchi, 4 20127 Milano – Italy Tel. 02 26113507 int 339 e-mail: stefanos@prisma-eng.com skype: stefano.stagnaro