On Tue, May 13, 2025 at 11:29:09AM +0200, Kevin Wolf wrote: > Am 13.05.2025 um 07:55 hat Christoph Hellwig geschrieben: > > On Mon, May 12, 2025 at 05:18:43PM +0200, Kevin Wolf wrote: > > > Yes, it's a bit unfortunate, but we have to work with what we have. QEMU > > > doesn't even necessarily know that it's dealing with a multipath device, > > > so it just has to blindly try the ioctl and see if it works. > > > > Why is qemu even using SG_IO to start with? > > How else would you do SCSI passthrough? > > Ok, from your replies to Hannes I understand an implicit message, you > wouldn't. But I don't think that's really an answer, at least not for > all users.
SG_IO is fine and the only way for SCSI passthrough. But doing SCSI passthrough through md-multipath just doesn't work. SCSI isn't built for layering, and ALUA and it's vendor-specific variants and alternatives certainly isn't. If you try that you're playing with fire and is not chance of ever moving properly.
