getting to 4K disk blocks in ZFS

[Karl Denninger]

On 9/11/2014 1:24 AM, Andriy Gapon wrote:
> On 11/09/2014 04:22, Steven Hartland wrote:
>> ----- Original Message ----- From: "Aristedes Maniatis" <ari at ish.com.au>
>>> Should the FreeBSD project change this minimum in the next release?
>>> There seems to be no downside and a huge amount of pain for people
>>> who stumble along with the defaults not knowing what a mess they are
>>> creating to solve later.
>> The downside is wasted space which can be significant and hence when
>> I last suggested just this it was unfortunately rejected.
>>
>> We still maintain a local patch to our source tree which does just
>> this because, as you've mentioned, we don't want the pain so its
>> easier to just run everything as 4k.
>
> 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.
>
It works great until you start replacing older disks with new, larger 
ones and find out that the new ones are 4k where the old ones were not.....

IMHO at this point in time it's worth considering a 4k default.

-- Karl

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