Switchover to CAM ATA?
scottl at samsco.org
Tue Apr 27 19:13:41 UTC 2010
On Apr 27, 2010, at 5:33 AM, Gavin Atkinson wrote:
> On Mon, 2010-04-26 at 10:33 -0600, M. Warner Losh wrote:
>> My opinion for the path forward:
>> (1) Send a big heads up about the future of ataraid(5). It will be
>> shot in the head soon, to be replaced be a bunch of geom classes
>> for each different container format. At least that seems to be
>> the rough consensus I've seen so far. We need worker bees to do
>> many of these classes, although much can be mined from the ataraid
>> code today.
> Losing ataraid would be bad. I suspect there are a lot of installs
> using it - especially as there is no way to create any other mirror from
> sysinstall. However, I'm not actually sure that the functionality it
> provides is easy to push down into GEOM.
> ataraid depends on knowing a lot about the underlying hardware, in order
> to know which format of metadata to use. i.e. it needs to know that the
> disks are attached to (say) a Highpoint controller.
This is unfortunately true, especially on older controllers. I think that there
are reasonable ways to address this though, by having CAM SIMs provide a
bit more information in their PATH_INQ response.
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