Hello, I want to use thin provisioning for my images and therefore I use the qcow2 format but for some reason ONE does not use sparse file copy / move operations. Here is what I did:
I have a datastore with qcow2 driver: oneadmin@one01:~$ onedatastore show 101 DATASTORE 101 INFORMATION ID : 101 NAME : rz1-01-image USER : oneadmin GROUP : oneadmin CLUSTER : RZ1 TYPE : IMAGE DS_MAD : fs TM_MAD : qcow2 BASE PATH : /var/lib/one/datastores/101 DISK_TYPE : FILE DATASTORE CAPACITY TOTAL: : 6.5T FREE: : 6.3T USED: : 132.9G LIMIT: : - PERMISSIONS OWNER : um- GROUP : u-- OTHER : --- DATASTORE TEMPLATE BASE_PATH="/var/lib/one/datastores/" CLONE_TARGET="SYSTEM" DISK_TYPE="FILE" DS_MAD="fs" LN_TARGET="NONE" TM_MAD="qcow2" TYPE="IMAGE_DS" IMAGES ... I created a new empty image: oneadmin@one01:~$ qemu-img create -f qcow2 -o preallocation=metadata debian.qcow2 4G This file takes only a few KB of disk space: oneadmin@one01:$ qemu-img info debian.qcow2 image: debian.qcow2 file format: qcow2 virtual size: 4.0G (4294967296 bytes) disk size: 784K cluster_size: 65536 So I import it into the Datastore with driver qcow2: oneadmin@one01:~$ oneimage create -d 101 --name debian --path ~/debian.qcow2 --prefix vd --type OS --driver qcow2 But as you can see after the import the file is 4GB in size: oneadmin@one01:~$ oneimage show debian IMAGE 28 INFORMATION ID : 28 NAME : debian USER : oneadmin GROUP : oneadmin DATASTORE : rz1-01-image TYPE : OS REGISTER TIME : 02/02 14:35:42 PERSISTENT : No SOURCE : /var/lib/one/datastores/101/0b96c87ba5445c347ad407bb1f4950ff PATH : /var/lib/one/debian.qcow2 SIZE : 4G STATE : rdy RUNNING_VMS : 0 PERMISSIONS OWNER : um- GROUP : --- OTHER : --- IMAGE TEMPLATE DEV_PREFIX="vd" DRIVER="qcow2" VIRTUAL MACHINES oneadmin@one01:~$ qemu-img info /var/lib/one/datastores/101/0b96c87ba5445c347ad407bb1f4950ff image: /var/lib/one/datastores/101/0b96c87ba5445c347ad407bb1f4950ff file format: qcow2 virtual size: 4.0G (4294967296 bytes) disk size: 4.0G cluster_size: 65536 I think this is due to the underlying copy operation does not handle qcow2 / sparse files correctly. You can reproduce same failures in bash: If you cp the file everything is fine but if you do a rsync or scp the file has its virtual size afterwards. For rsync there is the switch -S to correctly handle sparse files, there is no such switch for scp tough. What am I doing wrong? Am I using the right way to create empty qcow2 / thin provisioned images? I want to create a vm and do a pxe install afterwards (works fine I only have the thin provisioning problem). I also tried to create an empty datablock using driver qcow2 and fs type ext4 but in that way I get a raw file. That one seems to be thin provisioned but I think I have some advantages if I use qcow2 (copy on write / snapshot performance). Thank you very much any help is very appreciated, Nils Schröder CEWE Stiftung & Co. KGaA mit Sitz in Oldenburg; Registergericht Oldenburg HR B 208214; Persönlich haftende geschäftsführende und vertretungsberechtigte Gesellschafterin: Neumüller CEWE COLOR Stiftung, Oldenburg Stiftungsverzeichnis der rechtsfähigen Stiftungen des bürgerlichen Rechts im Bezirk der Regierungsvertretung Oldenburg Nummer 15(034); Vorstand: Dr. Rolf Hollander, Vorsitzender; Dr. Reiner Fageth, Carsten Heitkamp, Andreas F.L. Heydemann, Dr. Olaf Holzkämper, Thomas Mehls, Harald H. Pirwitz, Frank Zweigle; Geschäftsführung: Patrick Berkhouwer Aufsichtsrat: Otto Korte (Vorsitzender) UST ID-Nr. DE815453806; St.-Nr. 64/200/38999; GLN 40 04468 00000 4
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