I just found package  liblinux-prctl-perl, which can do

Linux::Prctl::capbset_drop(CAP_SYS_RAWIO);

That way we could do it inside perl before the SCSI INQUIRY syscall.
Would that solve the problem?

But we would need to fork before calling capbset_drop ...

> On February 25, 2016 at 6:54 AM Dietmar Maurer <diet...@proxmox.com> wrote:
> 
> 
> > #capsh --drop=cap_sys_rawio -- -c 'sg_inq /dev/pve/vm-115-disk-2'
> > Both SCSI INQUIRY and fetching ATA information failed on
> > /dev/pve/vm-115-disk-2
> 
> Why --drop=cap_sys_rawio ? Does kvm drop this when starting?

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