Device's "stolen" sector

[Domagoj Smolčić]

On Tue, 16 Jul 2019 15:34:47 -0600
Warner Losh <imp at bsdimp.com> wrote:

> On Tue, Jul 16, 2019 at 2:44 PM Domagoj Smolčić
> <rank1seeker at gmail.com> wrote:
> 
> > On Tue, 16 Jul 2019 13:27:43 -0600
> > Warner Losh <imp at bsdimp.com> wrote:
> >  
> > > On Tue, Jul 16, 2019 at 11:05 AM Wojciech Puchar
> > > <wojtek at puchar.net> wrote:
> > >  
> > > >
> > > >
> > > > On Tue, 16 Jul 2019, Domagoj Smolčić wrote:
> > > >  
> > > > > 11.2-RELEASE-p9
> > > > >
> > > > > Tested with >1 disks:
> > > > > --
> > > > > SATA disk connected directly with SATA cable to MBO, shows
> > > > > correct  
> > > > amount of sectors.  
> > > > >    diskinfo -v ada1
> > > > >
> > > > > When I connect it to the same MBO over USB to SATA adapter, 1
> > > > > sector is  
> > > > missing (the last one)  
> > > > >    diskinfo -v da0
> > > > >
> > > > > Having last sector inaccessible is a huge problem as many
> > > > > "things" use  
> > > > it for a metadata.  
> > > > > This has many times caused MBR disks occasionally to not be
> > > > > visible at  
> > > > all while being 'da0' (gpart: No such geom: da0.)  
> > > > > And also GPT disks to be in a [CORRUPT] state upon reattach
> > > > > directly to  
> > > > SATA interface.  
> > > > >
> > > > > Before submitting a bug, there is only 1 variable left that I
> > > > > can't  
> > > > test, because I have only 1 USB to SATA adapter.  
> > > > > It might be a hardware issue, so can someone else test this
> > > > > too? 
> > > > i have two external disk chassis with USB-SATA bridge, works
> > > > just fine
> > > >
> > > > recently connected through it disk that was geli encrypted when
> > > > directly connected to server. geli worked so all is fine as geli
> > > > header is in last sector
> > > >  
> > >
> > > It all depends... There's huge variation in the quality of
> > > USB-SATA bridges. Some get in the way and do things like round
> > > off the last sector when the reported capacity is odd, for
> > > example. Which is why I'm trying to see if there's an issue with
> > > that, or if the issue is something in the da driver. For drives
> > > with an even number of sectors, there's likely no issues at all...
> > >
> > > Warner
> > >  
> >
> > Well, I've installed sysutils/sg3_utils, but required sg device
> > will have to wait,
> > as I can't recompile kernel ATM.
> >
> > Regarding quality ..., this one was so cheap that I've got it for
> > free. ;) Regarding capacity ..., HDD has EVEN number of sectors.
> >
> > Last HDD checked (just before posting) Hitachi:
> > ========
> > # diskinfo -v ada1 | awk '/mediasize in sectors/{print $1}'
> > 312581808
> >
> > # gpart show -p ada1  
> > =>       63  312581745    ada1  MBR  (149G)  
> >     312581745 + 63 = 312581808
> >
> > All OK!
> >
> >
> > # diskinfo -v da0 | awk '/mediasize in sectors/{print $1}'
> > 312581807
> >
> > # gpart show -p da0
> > gpart: No such geom: da0.
> >     Showed nothing (usually it does even in this cases)
> >  
> 
> What does sg_readcap from sg3_utils package say?

Wait.

When I intended to recompile kernel with sg device, I also decided to bring
11.2 to latest patch version and this also includes world recompilation.

But I just saw 11.3 is production ready, so If I'm already doing
world+kernel why to not migrate to 11.3 in a process.

You'll have it tomorrow.


Domagoj

> Warner
>