also see: https://pve.proxmox.com/pipermail/pve-devel/2012-August/003347.html
> On 9 October 2019 17:39 Thomas Lamprecht <t.lampre...@proxmox.com> wrote: > > > On 10/8/19 12:54 PM, Daniel Berteaud wrote: > > ----- Le 8 Oct 19, à 12:28, Thomas Lamprecht t.lampre...@proxmox.com a > > écrit : > > > >> > >> Thanks for the nice write up and clear reproducer! > >> > >> It seems that if we cannot use the same backend for all disks we need to > >> die when a disk move to a storage backend is request, and that move would > >> need to change the scsi "backend". > >> As I'd not like to die it would be better to see if there's still the need > >> for different backends. > > > > Dying wouldn't be very nice indeed (I need to be able to move disks between > > NFS and ZFS over iSCSI on a regular basis) > > > > If scsi-hd was always selected, there would be no issue. I've patched my > > QemuServer.pm to do that for now. > > Not sure if scsi-generic/scsi-block has any advantages, but I couldn't > > measure performance diff in my case. unmap is also passed correctly with > > scsi-hd. IMHO, unless there are strong values with them (which I'am unaware > > off, but I couldn't find any documentation about all those backends), we > > should always use scsi-hd, as it's working with all storage types and > > allows live disk move from any storage type to any other, including the > > issue I have specific to ZFS over iSCSI (guest I/O error during live move > > from ZFS over iSCSI to something else) > > I would actually really like to change this to scsi-hd, but we need to be sure > it's OK for all possible supported setups.. > > So I tried to investigate a bit how it came to the use of scsi-generic, I came > to a commit[0] from Alexandre (CCd) which adds support for access with > libiscsi. > > Maybe he knows why the -generic was used and not the -hd one? > > [0]: > https://git.proxmox.com/?p=qemu-server.git;a=commitdiff;h=d454d040338a6216c8d3e5cc9623d6223476cb5a > > cheers, > Thomas > > > _______________________________________________ > pve-devel mailing list > pve-devel@pve.proxmox.com > https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel _______________________________________________ pve-devel mailing list pve-devel@pve.proxmox.com https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
