getting to 4K disk blocks in ZFS

[Justin T. Gibbs]

On Sep 19, 2014, at 5:43 PM, Steven Hartland <killing at multiplay.co.uk> wrote:

> 
> ----- Original Message ----- From: "Karl Denninger" <karl at denninger.net>
> 
>> >> 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 :(
>> >
>> >
>> Where is Smartctl getting it from?
>> smartctl -i /dev/da2
>> smartctl 6.3 2014-07-26 r3976 [FreeBSD 10.1-BETA1 amd64] (local build)
>> Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org
>> === START OF INFORMATION SECTION ===
>> Device Model:     HGST HDN724040ALE640
>> Serial Number:    PK2334PCG6NA0B
>> LU WWN Device Id: 5 000cca 24cc30684
>> Firmware Version: MJAOA5E0
>> User Capacity:    4,000,787,030,016 bytes [4.00 TB]
>> Sector Sizes:     512 bytes logical, 4096 bytes physical
>> Rotation Rate:    7200 rpm
>> Form Factor:      3.5 inches
>> Device is:        Not in smartctl database [for details use: -P showall]
>> ATA Version is:   ATA8-ACS T13/1699-D revision 4
>> SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
>> Local Time is:    Fri Sep 19 18:33:16 2014 CDT
>> SMART support is: Available - device has SMART capability.
>> SMART support is: Enabled
>> It's not coming from a database, as Smartctl doesn't know about these
>> (yet); they're too new.
> 
> Exception to prove the rule?
> 
> What to "camcontrol identify da2" report?

Was there some recent change made to have that command report sector size information?  Last I checked, it didn’t.

—
Justin