Github user dmytro-shevchenko commented on the pull request: https://github.com/apache/cloudstack/pull/1230#issuecomment-214497874 Rebase with Master done, pom.xml file updated. Also I perform a small modification in code, during testing I found one issue: in 'snapshot_store_ref' table all snapshots from one volume was linked between each other as Parent->Child using field 'parent_snapshot_id'. If you removing one of previous snapshot and wait for 'storage.cleanup.interval' period, it lead to NullPointerException when you creating new snapshot, because Cloudstack trying to build all this snapshot relations before. Before this patch this field was always set to '0' (no parent). From Cloudstack point of view all snapshots on Ceph not connected (Ceph care about this on his own level). So, in file engine/storage/snapshot/src/org/apache/cloudstack/storage/snapshot/XenserverSnapshotStrategy.java: I moved this block: `SnapshotDataStoreVO snapshotDataStoreVO = snapshotStoreDao.findByStoreSnapshot(primaryStore.getRole(), primaryStore.getId(), snapshot.getId()); if (snapshotDataStoreVO != null) { snapshotDataStoreVO.setParentSnapshotId(0L); snapshotStoreDao.update(snapshotDataStoreVO.getId(), snapshotDataStoreVO); }` from the condition: ...primaryStore).getPoolType() != StoragePoolType.RBD and it will be executed in any way, as previously. Please review this part of code, if this is good solution.
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