Date: Sat, 20 Sep 2014 00:23:28 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Justin T. Gibbs" <gibbs@scsiguy.com>, "Willem Jan Withagen" <wjw@digiware.nl> Cc: freebsd-stable@freebsd.org, Peter Wemm <peter@wemm.org>, Andriy Gapon <avg@freebsd.org>, Aristedes Maniatis <ari@ish.com.au> Subject: Re: getting to 4K disk blocks in ZFS Message-ID: <607F83CE25104CE09C74935BA9E26485@multiplay.co.uk> References: <540FF3C4.6010305@ish.com.au> <A0A549F7A4094F519A3660697AB4983F@multiplay.co.uk> <54114029.3060507@FreeBSD.org> <2128347.Ah5i0RTCvp@overcee.wemm.org> <541230F1.3060402@digiware.nl> <7D0869A9-C114-4C4F-877A-3FB26AD7737D@scsiguy.com>
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----- Original Message -----
> From: "Justin T. Gibbs" <gibbs@scsiguy.com>
> To: "Willem Jan Withagen" <wjw@digiware.nl>
> Cc: "Steven Hartland" <killing@multiplay.co.uk>; <freebsd-stable@freebsd.org>; "Andriy Gapon" <avg@freebsd.org>; "Peter Wemm"
> <peter@wemm.org>; "Aristedes Maniatis" <ari@ish.com.au>
> Sent: Saturday, September 20, 2014 12:07 AM
> Subject: Re: getting to 4K disk blocks in ZFS
>
>
> On Sep 11, 2014, at 5:32 PM, Willem Jan Withagen <wjw@digiware.nl> wrote:
>
> > On 11-9-2014 19:49, Peter Wemm wrote:
> >>> Another downside is 1/4th of uberblocks, 32 vs 128.
> >>> Also, automatic sector size detection works great for me and I've never had
> >>> a need to manually tweak ashift.
> >>
> >> Unfortunately, I have. Same drive connected two different ways:
> >>
> >> da12 at mps1 bus 0 scbus1 target 11 lun 0
> >> da12: <ATA ST4000VN000-1H41 SC43> Fixed Direct Access SCSI-6 device
> >> da12: 600.000MB/s transfers
> >> da12: Command Queueing enabled
> >> da12: 3815447MB (7814037168 512 byte sectors: 255H 63S/T 486401C)
> >>
> >> ada1 at ahcich1 bus 0 scbus3 target 0 lun 0
> >> ada1: <ATA ST4000VN000-1H41 SC43> ATA-8 SATA 3.x device
> >> ada1: 600.000MB/s transfers (SATA 3.x, UDMA6, PIO 8192bytes)
> >> ada1: Command Queueing enabled
> >> ada1: 3815447MB (7814037168 512 byte sectors: 16H 63S/T 16383C)
> >> ada1: quirks=0x1<4K>
> >>
> >> The 4k flag is missing when it's on the sas controller. The Ident strings are
> >> changed.
> >>
> >> This came up elsewhere recently.
> >
> > I reported the same fact for the new set of WD REDs I installed.
> > Seems that ada and da have different quirks tables...
> > So disks on SATA connectors on the motherboard are diagnosed as being 4Kb.
> > The disks on my twa don't get the quirk and are considered 512b
> >
> > —WjW
>
> I’m surprised that we have to constantly add quirks. Are these drives really
> failing to report their ata params correctly? Is there a reason we don’t
> currently utilize the ata params data (which is already fetched for trim/unmap
> detection) to also set lbppbe (logical block per physical block exponent) and
> lalba (lowest aligned lba)? We may find that many of the existing quirks are
> unnecessary if we fix the probe code.
On the contary I've not found a single drive which reports 4k sectors on its
own, every single one that I've seen report 4k is because we've added a
quirk for it :(
Regards
Steve
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