When is sataIII actually sataIII?

[Erich Dollansky]

Hi,

On Thu, 01 Nov 2018 06:45:59 -0700
spamless at mail-on.us wrote:

> On 2018-11-01 03:59, Frank Leonhardt (M) wrote:
> > On 1 November 2018 05:14:35 GMT+00:00, spamless at mail-on.us wrote:  
> >> Hi all,
> >> I picked out, and put together some hardware for a new FreeBSD
> >> powered box. I chose a WD blue drive I knew was pretty zippy.
> >> But I was quite disappointed to discover that FreeBSD wouldn't
> >> support it @6Gb.
> >> The following output from dmesg(8):
> >> GEOM: new disk ada0
> >> ada0: <WDC WD10EZEX-75WN4A0 01.01A01> ACS-3 ATA SATA 3.x device
> >> ada0: Serial Number WD-WCC6Y3CJCTDC
> >> ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> >> ada0: Command Queueing enabled
> >> ada0: 953869MB (1953525168 512 byte sectors)
> >> 
> >> My hardware supports it; both drive, and controller. Yet for
> >> some reason FreeBSD will only *acknowledge* the capabilities.
> >> Do I need to impose some quirk, or something.
> >> 
> >> Thanks!  
> > 
> > That is saying it will do transfers at 300 Megabytes/second on the
> > interface. You'll be lucky to get that from a WD desktop drive due
> > to mechanical limitations. WD blues at 1Tb tend to do 125-150MBps
> > tops, and the range released a couple of years back (2015?) seem
> > slower than the previous generation, although the spindle speeds
> > vary.
> > 
> > 6G vs. 3G is only interesting talking to silicone drives or a SATA 
> > expander.
> > 
> > But an interesting question - why does it say SATA2 instead of
> > SATA3?  
> 
> Thanks for your reply, Frank!
> Be that as it may. As platters go. I bought this 1Tb WD blue, because 
> all
> the stats for it indicated it was faster that all the major
> competitors, and interestingly, faster than their "high-end" Black
> counterpart. I also
> bought it, because it was quieter than all the others.
> That said; given that the port it runs off of, and the drive is truly
> a Sata 3 (3.1). Why won't FreeBSD treat it as such. Why does it
> penalize the drive?
> I have another Sata 3 drive on the second Sata 3 port, that FreeBSD
> actually treats as what it is:
> ada1 at ahcich1 bus 0 scbus1 target 0 lun 0
> ada1: <ST3000DM001-1CH166 CC47> ACS-2 ATA SATA 3.x device
> ada1: Serial Number W1F55VT9
> ada1: 600.000MB/s transfers (SATA 3.x, UDMA6, PIO 8192bytes)
> ada1: Command Queueing enabled
> ada1: 2861588MB (5860533168 512 byte sectors)
> ada1: quirks=0x1<4K>
> 
> note the "quirks" - is that good, or bad?
> 
> In the end, it appears that I have to purchase a slower rated (Sata
> 3) drive
> to get FreeBSD to treat it as a Sata 3 drive? It makes no sense to
> me. Which
> is why I came here; in hopes of finding out *why* it appears as it
> does. :)
> 
> Thanks again, Frank!
> 
> Oh! In case it matters; this is on 12 (CURRENT)
> 

forget about the marketing bullshit. You might have a very basic
problem: the cable.

Just change cables randomly. If you see then changes on a drive, you
have to expect that there is a problem with the cable.

Erich