Re: Recognizing SMR HDDs

On Thu, May 26, 2016 at 15:02:24 +0100, Igor Mozolevsky wrote:
> On 26 May 2016 at 14:41, Kenneth D. Merry <ken_at_freebsd.org> wrote:
> 
> > On Thu, May 26, 2016 at 15:29:21 +0200, Gary Jennejohn wrote:
> > > On Thu, 26 May 2016 08:34:45 -0400
> > > "Kenneth D. Merry" <ken_at_FreeBSD.ORG> wrote:
> > >
> > > > On Thu, May 26, 2016 at 08:42:53 +0200, Gary Jennejohn wrote:
> > > > What kind of drive is it?
> > > >
> > >
> > > ST8000AS 0002-1NA17Z 0X03
> >
> 
> [snip]
> 
> 
> > Yes.  There is something slightly odd about the Inquiry data you pasted
> > above.  Seagate didn't set the bits in the ATA identify data to mark it as
> > a Drive Managed drive, so I put in a quirk entry to mark it as Drive
> > Managed.
> >
> > Unfortunately with Drive Managed drives that is really all you know.  You
> > don't know the zone boundaries or states.  But, it is useful to know that
> > you really should write sequentially for good performance.  (True of any
> > drive, but especially true with SMR drives.)
> >
> 
> The drive is supposed to have Word 69 set to 0x0001 and support ZAC MGMT
> IN/OUT -
> http://www.seagate.com/www-content/product-content/hdd-fam/seagate-archive-hdd/en-us/docs/100795782a.pdf
> at pg. 24 and 28.

That is a different drive.  He has ST8000AS0002, which is a Drive Managed
drive.  The doc above is for ST8000AS0022, which is a Host Aware drive.

> Incidentally AR17 firmware is a new batch, perhaps Seagate did what they
> did with -DL003 drives where the early models reported 512n sector size (so
> as not to confuse computers) and the later models properly reported 4kn
> sector size?

Yes, AR17 is the latest firmware.  He really needs to upgrade, there are
bugs with older versions.

AR17 firmware reports the same thing in terms of sector size.  For
instance, from one of mine:

rotocol              ATA/ATAPI-9 SATA 3.x
device model          ST8000AS0002-1NA17Z
firmware revision     AR17
serial number         Z8409926
WWN                   5000c50086f84017
cylinders             16383
heads                 16
sectors/track         63
sector size           logical 512, physical 4096, offset 0
LBA supported         268435455 sectors
LBA48 supported       15628053168 sectors
PIO supported         PIO4
DMA supported         WDMA2 UDMA6 
media RPM             5980

Ken
-- 
Kenneth Merry
ken_at_FreeBSD.ORG