On 05/31/2016 03:28, Jan Beich wrote:
> Allan Jude <allanj...@freebsd.org> writes:
> 
>> Author: allanjude
>> Date: Tue May 31 04:12:14 2016
>> New Revision: 301010
>> URL: https://svnweb.freebsd.org/changeset/base/301010
>>
>> Log:
>>   Connect the SHA-512t256 and Skein hashing algorithms to ZFS
>>   
>>   Support for the new hashing algorithms in ZFS was introduced in r289422
>>   However it was disconnected because FreeBSD lacked implementations of
>>   SHA-512 (truncated to 256 bits), and Skein.
>>   
>>   These implementations were introduced in r300921 and r300966 respectively
>>   
>>   This commit connects them to ZFS and enabled these new checksum algorithms
>>   
>>   This new algorithms are not supported by the boot blocks, so do not use 
>> them
>>   on your root dataset if you boot from ZFS.
> 
> Can you document the feature and booting caveat in zpool-features(7) manpage?
> And Illumos seems to limit booting support to pools vs. datasets.
> 

+1. Also, zfs(8) needs to be updated.

>   Booting off of pools using skein is NOT supported -- any attempt to
>   enable skein on a root pool will fail with an error.
> 
> https://illumos.org/man/5/zpool-features
> 

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