getting to 4K disk blocks in ZFS

[Willem Jan Withagen]

On 12-9-2014 10:17, Steven Hartland wrote:
> 
> ----- 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.

Hi Steven,

Well actually IMHO the quirk tables should be "joined".
Because it is nowadays very simple to get a sata device on a scsi-device
(da??) be it USB, or a controller that make the world look like
/dev/da?? Like the twa I have.
I guess the other way scis devices turning up under ATA would not be common.

That said, it will not be so simple, otherwise somebody(tm) would have
done so already?

the WD RED under ata:
ada4 at ahcich10 bus 0 scbus11 target 0 lun 0
ada4: <WDC WD30EFRX-68AX9N0 80.00A80> ATA-9 SATA 3.x device
ada4: Serial Number WD-WMC1T4089783
ada4: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada4: Command Queueing enabled
ada4: 2861588MB (5860533168 512 byte sectors: 16H 63S/T 16383C)
ada4: quirks=0x1<4K>

under twa
da0 at arcmsr0 bus 0 scbus8 target 0 lun 0
da0: <WDC WD30EFRX-68AX9N0 R001> Fixed Direct Access SCSI-5 device
da0: Serial Number WD-WMC1T4081674
da0: 250.000MB/s transfers (125.000MHz, offset 32, 16bit)
da0: Command Queueing enabled
da0: 2861588MB (5860533168 512 byte sectors: 255H 63S/T 364801C)
da0: Delete methods: <NONE(*)>

--WjW