Hi Wesley, Currently, there is no direct way to change disks allocation policy (thin-provision <-> preallocation). In your case, it sounds like your ISCSI storage is running out of space, changing disk from thin-provisioned to preallocation will consume *more* space on the storage, thin-provision is more space effective but impact the performance. On Mon, Apr 15, 2019 at 8:35 PM Wesley Stewart <wstewart3(a)gmail.com&gt; wrote: > I am currently running a ZFS server (Running RaidZ2) and I have been > experimenting with NFS and shares to host my guests. I am currently > running oVirt 4.2.8 and using a RaidZ2 NFS mount for the guests. > > ZFS definitely is definitely pretty awful (At least in my experience so > far) for hosting VMs. I believe this is due to the synchronous writes > being performed. However, I think running an iSCSI target with > Synchronization disabled over a 10Gb connection might do the trick. (I have > a couple of mirroed SSD drives for performance if I need it, but the RaidZ2 > crawls for disk speed). > > When I tried to migrate a thin provisioned guest to iSCSI, I keep getting > an "Out of disk space error" which I am pretty sure is due to the block > style storage on the iSCSI target. Is there a way to switch from Thin to > Preallocated? Or is my best bet to try and take a snapshot and clone this > into a pre-allocated disk? > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-leave(a)ovirt.org > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/users@ovirt.org/message/SZDBAGS6Y66... > -- Regards, Eyal Shenitzky On Mon, Apr 15, 2019 at 8:35 PM Wesley Stewart <wstewart3(a)gmail.com&gt; wrote: > I am currently running a ZFS server (Running RaidZ2) and I have been > experimenting with NFS and shares to host my guests. I am currently > running oVirt 4.2.8 and using a RaidZ2 NFS mount for the guests. > > ZFS definitely is definitely pretty awful (At least in my experience so > far) for hosting VMs. I believe this is due to the synchronous writes > being performed. However, I think running an iSCSI target with > Synchronization disabled over a 10Gb connection might do the trick. (I have > a couple of mirroed SSD drives for performance if I need it, but the RaidZ2 > crawls for disk speed). > > When I tried to migrate a thin provisioned guest to iSCSI, I keep getting > an "Out of disk space error" which I am pretty sure is due to the block > style storage on the iSCSI target. Is there a way to switch from Thin to > Preallocated? Or is my best bet to try and take a snapshot and clone this > into a pre-allocated disk? > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-leave(a)ovirt.org > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/users@ovirt.org/message/SZDBAGS6Y66... > -- Regards, Eyal Shenitzky