Thank you, Darren and Richard. I think this gives what I wanted.

Yi

On Mon, Feb 15, 2010 at 3:13 PM, Darren J Moffat <darren.mof...@sun.com> wrote:
> On 15/02/2010 19:15, Yi Zhang wrote:
>>>
>>> Can you create a zvol and use that for ufs?  Slow, but ...
>>>
>>> Casper
>>>
>>>
>>
>> Casper, thanks for the tip! Actually I'm not sure if this would work
>> for me. I wanted to use directio to bypass the file system cache when
>> reading/writing files. That's why I chose UFS instead of ZFS. Now if I
>> create UFS on top of zvol, I'm not sure if a call to directio() would
>> actually do its work...
>
> Why not just use ZFS and set the similar options on the ZFS dataset:
>        zfs set primarycache=metadata <datasetname>
>
> That is a close approximation to the UFS feature of directio() for bypassing
> storing the data in the filesystem cache.
>
> --
> Darren J Moffat
>
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