[ovirt-devel] Re: Local domain, Intel Optane DC

On Sun, May 19, 2019 at 9:04 PM Hetz Ben Hamo <hetz(a)hetz.biz&gt; 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)?

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(a)ovirt.org > To unsubscribe send an email to devel-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/devel@ovirt.org/message/6VDXFP6NFUI... -- Didi _______________________________________________ Devel mailing list -- devel(a)ovirt.org To unsubscribe send an email to devel-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/devel@ovirt.org/message/VS72KTRQQSE...