On Sun, Mar 5, 2017 at 1:03 AM, Marcin Kruk <askifyouneed@gmail.com> wrote:

Could somebody give me a links to doc or explain behavior of lv volumes in RHV 4 cluster, once they are active another time they are incative, and how to corelate the lv volumes names with disks of virtual machines, or other disks?

On engine side: - Storage domain has disks - Disk may have one or more snapshots On vdsm side: - Storage domains are lvm volume groups - Snapshot are logical volumes in the storage domain volume group called "volume" in vdsm. - Disk uuid is stored as logical volume tag in each snapshot called "image" in vdsm. This is correct for block storage (iSCSI, FC). File storage is completely different but I guess that you are interested in block storage. On vdsm side, logical volumes must be inactive unless a logical volume is used for running vm or for storage operation. There are special logical volumes (inbox, outbox, master, metadata, ids, leases, xleases) that are active when a storage domain is active. To correlate engine and vdsm sides: 1. Find the storage domain uuid using the REST api https://server-address/ovirt-engine/api/storagedomains/ 2. List lvs in vdsm side lvs -o name,tags vg_name You can see the disk uuid in the IU_<uuid> tags. (Image UUID) To locate snapshots of particular disk you can use --select lvs --select 'lv_tags = { IU_<disk-uuid> }' vg_name Example: # lvs --select 'lv_tags = { IU_db343be2-f709-4835-b1c5-a1bbdb650b2a }' aed577ea-d1ca-4ebe-af80-f852c7ce59bb LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert 91799827-85b8-450d-a521-42de12fa08e6 aed577ea-d1ca-4ebe-af80-f852c7ce59bb -wi-ao---- 1.00g Finally, you can also use vdsm-tool to show all disks on a storage domain: # vdsm-tool dump-volume-chains aed577ea-d1ca-4ebe-af80-f852c7ce59bb Images volume chains (base volume first) image: 239d9e96-ad7d-4a7d-83af-d593877db11b - 93331705-46be-4cb8-9dc2-c1559843fd4a status: OK, voltype: SHARED, format: COW, legality: LEGAL, type: SPARSE image: aab45dbc-c016-4990-b834-ce455bbc4fef - ea556b30-e62b-4d66-b832-459a5dd01890 status: OK, voltype: LEAF, format: RAW, legality: LEGAL, type: PREALLOCATED image: db343be2-f709-4835-b1c5-a1bbdb650b2a - 93331705-46be-4cb8-9dc2-c1559843fd4a status: OK, voltype: SHARED, format: COW, legality: LEGAL, type: SPARSE - 91799827-85b8-450d-a521-42de12fa08e6 status: OK, voltype: LEAF, format: COW, legality: LEGAL, type: SPARSE image: 7324cafc-905f-475e-8217-1a919bcca9e9 - dfbf69fc-3371-42d4-8298-415a6ad4244a status: OK, voltype: LEAF, format: RAW, legality: LEGAL, type: PREALLOCATED Nir