On Mon, May 20, 2019 at 9:26 AM Yedidyah Bar David <didi@redhat.com> wrote:
On Sun, May 19, 2019 at 9:04 PM Hetz Ben Hamo <hetz@hetz.biz> wrote:
Hi,
In oVirt 4.3 it looks like the storage domains has been consolidated to
data only and ISO, export are being deprecated, which IMHO is a good thing. However, when it comes to local storage and storage domains (when trying to mount local directory etc..) - the behavior of oVirt, IMHO, is weird, compared to other virtualization - your VM's are being switched to another domain, instead of just leaving them in the same domain and disabling live migration.
So, as I mentioned above, I don't see any reason for this switching if
using local storage, but now there's a new technology on the block - the Optane DC, and Samsung will probably show their NVDiMM solution soon.
In both cases - in order to use this persistent memory, you'll need to
"cut" part of the NVDiMM and mount it on the VM along side with your other NFS/iSCSI disks. This could probably kill live migration (at least in the first stage - see AMD MxGPU in the KVM forum video's work from AMD and Alibaba with live migration) - but that's a pretty good solution to utilize Optane DC/NVDiMM.
So my question is: Is there any chance that oVirt 4.4 will finally allow
local storage to be just like NFS/iSCSI instead of kicking the node to another domain?
Not sure about a redesign of the architecture (e.g. breaking the local/shared DC distinction), but one of the following already-existing hooks might be enough for your needs:
https://ovirt.org/documentation/admin-guide/appe-VDSM_and_Hooks.html https://www.ovirt.org/develop/developer-guide/vdsm/hooks.html
https://github.com/oVirt/vdsm/tree/master/vdsm_hooks/localdisk
https://www.ovirt.org/develop/developer-guide/vdsm/hook/scratchpad.html
https://www.ovirt.org/develop/developer-guide/vdsm/hook/vmdisk.html
Adding danken. Dan - do we have any recommendations re this? Is localdisk preferred over vmdisk? localdisk is newer, has much more documentation, but only in the source, not on the website.
Also, will there be a functionality through the web interface to
copy/move files between storage domains? I don't see it anywhere.
No idea, did you file an RFE (or know about one)?
Copy/move in the UI will be part of the next 4.3 minor release: https://bugzilla.redhat.com/show_bug.cgi?id=1600432 https://gerrit.ovirt.org/#/c/99988/
Best regards,
(In case you guys in Israel need some Optane DC's sticks, I can talk to
Intel Israel about it)
Thanks Hetz _______________________________________________ Devel mailing list -- devel@ovirt.org To unsubscribe send an email to devel-leave@ovirt.org Privacy Statement: https://www.ovirt.org/site/privacy-policy/ oVirt Code of Conduct:
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