Accessing static drive info w/o ATA identify and lockup with camcontrol identify

[Kevin Bowling]

Thanks Ravi!

Rotation rate is probably the most important thing and thankfully easy as
you suggested:
https://reviews.freebsd.org/D4483.  Would be nice to land that in 10.3 so I
can swap the SaltStack module over to it.

Next in priority would be getting firmware version..
In 'camcontrol identify' it looks like:  'firmware revision     DXM9203Q'
In 'camcontrol inquiry' it's part of the device string like: 'pass0:
<SAMSUNG MZ7WD480HCGM-00003 DXM9203Q> ACS-2 ATA SATA 3.x device'
Do you have any suggestions for wiring that into geom disk?

And lastly, yes bus speeds would be nice (especially to spot hard/soft
misconfiguration).  It shows up like 'protocol              ATA/ATAPI-9
SATA 3.x' in camcontrol identify and can be seen in the inquiry string
above too.  Do you have design suggestions on that?

Regards,

On Fri, Dec 4, 2015 at 9:23 AM, Ravi Pokala <rpokala at mac.com> wrote:

> >Date: Fri, 4 Dec 2015 02:13:31 -0700
> >From: Kevin Bowling <kevin.bowling at kev009.com>
> >To: freebsd-scsi at freebsd.org
> >Subject: Accessing static drive info w/o ATA identify and lockup with
> >       camcontrol identify
> >Message-ID:
> >       <CAK7dMtDw7-eFL0HDik3X6O=
> QA0jKsbuH9wSOTjDiiQdmJhmKJg at mail.gmail.com>
> >Content-Type: text/plain; charset=UTF-8
> >
> >...
> >
> >#2 This all came about because I want to poll device information like disk
> >model, serial number, speeds, etc.  Common use cases would be
> configuration
> >management systems and inventory databases.  Issuing an ATA identify seems
> >a bit much and could trigger unwanted HW errata like above.  I'm wondering
> >if it would be better to cache the data on interface change in sysctls or
> >something.  The data is static, read only, but we need to account for disk
> >swaps.
>
> At least some of it is already available via `geom disk list':
>
>     [daneel:~] rpokala% geom disk list ada5
>     Geom name: ada5
>     Providers:
>     1. Name: ada5
>        Mediasize: 2000398934016 (1.8T)
>        Sectorsize: 512
>        Stripesize: 4096
>        Stripeoffset: 0
>        Mode: r1w1e1
>        descr: WDC WD20EFRX-68EUZN0
>        lunid: 50014ee20b9f7c0f
>        ident: WD-WCC4M1VN0P7L
>        fwsectors: 63
>        fwheads: 16
>
>
>
> GEOM keeps this data in a "struct disk", which is populated during drive
> attach. You can see that the drive model ("descr") and serial number
> ("ident") are already listed by GEOM. "struct disk" also already has a
> rotation-rate field; if that's what you mean by "speeds", it should be
> trivial for me to add that to the GEOM output as well.
>
> If by "speeds", you're talking about the connection's bus speed (i.e.
> 3/6/12Gbps), then that's probably more complicated.
>
> -Ravi (rpokala@)
>
> >Regards,
> >Kevin
>
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