getting to 4K disk blocks in ZFS

[Steven Hartland]

----- Original Message ----- 
From: "Willem Jan Withagen" <wjw at digiware.nl>


> 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

LMK the ident strings and I'll look to update the quirks tables.

    Regards
    Steve