Re: [gentoo-user] Can't create valid btrfs on NVMe

[Peter Humphrey]

On Thursday 18 Aug 2016 15:56:50 Adam Carter wrote:
> On Thu, Aug 18, 2016 at 8:26 AM, Neil Bothwick <neil@××××××××××.uk> wrote:
> > I'm putting together a new desktop using a Samsung SM951 NVMe drive. I
> > booted sysrescd, partitioned the drive and ran
> >
> > mkfs.btrfs /dev/nvme0n1p3
> > mount /dev/nvme0n1p3 /mnt/custom
> >
> > df -T, mount and findmnt all show this is mounted as a btrfs filesystem,
> > e.g.
> >
> > /dev/nvme0n1p3 on /mnt/custom type btrfs (rw,relatime,ssd,space_cache)
> >
> > I can create files in here but cannot do anything btrfs-y
> >
> > % btrfs filesystem show /mnt/custom
> > ERROR: not a valid btrfs filesystem: /mnt/custom
> >
> > % btrfs subvolume create /mnt/custom/test
> > Create subvolume '/mnt/custom/test'
> > ERROR: cannot create subvolume: Inappropriate ioctl for device
> >
> > Google has been no help at all.
>
> I'm assuming tools are expecting SATA (or SCSI) and need an update or
> alternative for nvm;
>
> # hdparm -i /dev/nvme0n1
>
> /dev/nvme0n1:
>  HDIO_DRIVE_CMD(identify) failed: Inappropriate ioctl for device
>  HDIO_GET_IDENTITY failed: Inappropriate ioctl for device
>
> Maybe SCSI emulation could work around it?
> CONFIG_BLK_DEV_NVME_SCSI

I don't have Neil's e-mail here - another KMail problem?

Neil, have you tried inspecting your drive with sys-apps/nvme-cli? I don't 
have any experience to relate as I haven't worked out how to use it yet, but 
it may help you.

-- 
Rgds
Peter