[ovirt-users] which functionality replaces vdsm-hook-vmdisk in ovirt 4.4 / CentOS 8 (and is it really deprecated?)

Hi there! I'm a newbie, so don't blame me fast :) I have few questions related to Hypervisor's local disk passthrough to VM strategies Preamble: we found vmdisk hook most comfortable way to use as a "gate to local storage functionality" in shared clusters. Let's assume, You have A. 2 or 4 TB large SSD, which You need to split on different usages: some diskspace provide for SQL / ETCd / Mongod etc. It must be fast, so no network in between. You have only one physical disk, so you can't passthrough whole of it to single VM. So you make LVM, and passthrough LVMs using vmdisk - this is how we did on some setups. B. 2 or 4 TB HDD for gluster bricks. At the end, You have few VMs, which "dies" together with Hypervisor, but most of VMs can live migration. In together with L7 application level fail-over, it can lead to non-critical level services level cluster, which is not so hard to throw in maintenance Yes, it does not work at real device speeds: simple dd operation with unpartitioned block device performs 3-4 times slower in VM, than on hypervisor. But, ability to mix workloads (migratable VMS with non migratable) within small cluster of hypervisors is more important, at some setups. So, there are questions coming... 1. As far as I understand, there is possibility to replace vmdisk-hook vith cmdline. But I didn't found a way, how to get it working. I always ended with "Could not open '/dev/***': No such file or directory." which I could not avoid anyhow. May be, someone can point me to an article or other thread, where there are clues, how to do that? 2. what's the story behind vmdisk hook? As far as I understand from https://github.com/oVirt/vdsm/blob/master/vdsm.spec.in its deprecated? Why? It is replaced with some functionality? Why did VDSM's hook repo been deleted from github (in order to avoid confuse?)? 3. Is it possible to achieve with any hook or some other instrument near hypervisor's performance of local disk? We are ready for inconveniences like custom setup handling / patches and so on Thanks in advance! It worked in 4.3.10 / CentOS 7, but the