Status of SAS ability to attach SATA devices

Status of SAS ability to attach SATA devices

[Ilia Sotnikov]

Hardware: IBM 206m, AIC 9405 SAS/SATA controller, 2 SATA drives.

Having read several threads about SAS ability to attach SATA devices
(what's needed in my case), I found that this is work-in-progress.

Also during the investigation I've found that there are exist several
GIT trees with different SAS / AIC94xx versions: maintained by James
Bottomley, Jeff Garzik and Luben Tuikov.

I've tried all three of above mentioned versions - PHYs are discovered
correctly (as far as I can tell) but no disk devices are registered.
According to comments in sources that's predictable.

Questions are:
- what tree is recommended to work on;
- how could I help (if could) to improve the situation.

Thanks in advance,
-- 
 Ilia Sotnikov

Re: Status of SAS ability to attach SATA devices

[Luben Tuikov]

--- Ilia Sotnikov <hostcc@gmail.com> wrote:
> Hardware: IBM 206m, AIC 9405 SAS/SATA controller, 2 SATA drives.
> 
> Having read several threads about SAS ability to attach SATA devices
> (what's needed in my case), I found that this is work-in-progress.
> 
> Also during the investigation I've found that there are exist several
> GIT trees with different SAS / AIC94xx versions: maintained by James
> Bottomley, Jeff Garzik and Luben Tuikov.

One of my GIT trees, has a spec complient SATL (with NCQ, etc) which
integrates with the aforementioned driver (the version I maintain,
not Bottomley's/Garzik's version).

    Luben

> I've tried all three of above mentioned versions - PHYs are discovered
> correctly (as far as I can tell) but no disk devices are registered.
> According to comments in sources that's predictable.
> 
> Questions are:
> - what tree is recommended to work on;
> - how could I help (if could) to improve the situation.
> 
> Thanks in advance,
> -- 
>  Ilia Sotnikov
> -
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Re: Status of SAS ability to attach SATA devices

[Brian King]

Ilia Sotnikov wrote:
> Hardware: IBM 206m, AIC 9405 SAS/SATA controller, 2 SATA drives.
> 
> Having read several threads about SAS ability to attach SATA devices
> (what's needed in my case), I found that this is work-in-progress.

I have a patchset to libata to enable the ipr driver to attach
SATA devices. My hope was that other drivers would be able to use this
as well.

> I've tried all three of above mentioned versions - PHYs are discovered
> correctly (as far as I can tell) but no disk devices are registered.
> According to comments in sources that's predictable.
> 
> Questions are:
> - what tree is recommended to work on;

I'm not sure if there is a single tree right now. scsi-misc-2.6 has all
the latest SAS transport updates and libata-dev#upstream has all the latest
libata changes. 


Brian

-- 
Brian King
eServer Storage I/O
IBM Linux Technology Center