Mixed ashift?

[Steven Hartland]

vfs.zfs.min_auto_ashift is only used when a device is added so you can set it add, then change.


On 31/03/2016 07:15, Allan Jude wrote:
> On 2016-03-31 02:13, Dustin Marquess wrote:
>> I have what I think is a pretty normal setup.. a bunch of HDDs plus 2 SSDs
>> (one ZIL, one SLOG).
>>
>> The HDDs are standard 512 byte sector drives.  The SSDs have 8k page sizes.
>>
>> In Illumos I added the SSDs to sd.conf and created the zpool and it shows
>> the HDDs as ashift 9 and the SSDs as ashift 13, like normal:
>>
>> # zdb -C | grep ashift
>>              ashift: 9
>>              ashift: 9
>>              ashift: 9
>>              ashift: 9
>>              ashift: 13
>>
>> The question is, how to replicate this in FreeBSD?  The old "gnop" method
>> doesn't work anymore, and setting "vfs.zfs.min_auto_ashift=13" causes it to
>> use 13 for the HDDs, which seems like a waste.  Is this not supported?
>>
>> Thanks!
>> -Dustin
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> gnop should work, and you'd set the ashift before you add the devices.
> So add the hard drives with it set to 9, then set it to 13 and add the SLOG
>