rdac mode on SLES10SP1

rdac mode on SLES10SP1

[Kirill Cherkashin]

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Hello,


Could you advise me on next matter.
We have DS4800 connected to SLES10&9. At the moment we're using 'native' 
IBM  rdac driver but we're going to soon jump to Linux mpio.
According to Novell's support site in SP1(with kernel 2.6.16)  MPIO would 
be supported by in rdac mode. 

patches.fixes/dm-mpath-rdac.patch: dm-multipath hardware handler for 
LSI/Engenio RDAC (FATE 300540).

http://www.novell.com/support/search.do?cmd=displayKC&docType=kc&externalId=http--supportnovellcom-techcenter-sdb-en-2005-04-slesmultipathinghtml&sliceId=&dialogID=43714828&stateId=1%200%203744908

However, here I found  that it should happened only with 2.6.23 kernel.

http://marc.info/?l=dm-devel&m=118729146220962&w=2

If you are using it in rdac mode, then you have to wait.
> Any idea when that should be? Or are there any kernel patches 
Usually they are released within 2-3 months of the last release. 2.6.22
was released on Jul 8th. So, it should be somewhere between Sep 8th and
Oct 8th 

Could someone clarify the situation. Support  SLES10SP1 already rdac mode 
or I should wait until SUSE new release ?

Regards,

Kirill 



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Re: rdac mode on SLES10SP1

[Tore Anderson]

* Kirill Cherkashin

> Could you advise me on next matter.
> We have DS4800 connected to SLES10&9. At the moment we're using 'native'
> IBM  rdac driver but we're going to soon jump to Linux mpio.
> According to Novell's support site in SP1(with kernel 2.6.16)  MPIO
> would be supported by in rdac mode.
> 
> 
> However, here I found  that it should happened only with 2.6.23 kernel.

  The RDAC hardware handler is included (in a usable form) in the
 kernel.org kernels starting from 2.6.23-rc4, if I recall correctly.

  I assume SuSE has simply backported it to their 2.6.16 kernel.  I know
 Red Hat has done the same for RHEL5.1, at least.

-- 
Tore Anderson

Re: rdac mode on SLES10SP1

[Hannes Reinecke]

Tore Anderson wrote:
> * Kirill Cherkashin
> 
>> Could you advise me on next matter.
>> We have DS4800 connected to SLES10&9. At the moment we're using 'native'
>> IBM  rdac driver but we're going to soon jump to Linux mpio.
>> According to Novell's support site in SP1(with kernel 2.6.16)  MPIO
>> would be supported by in rdac mode.
>>
>>
>> However, here I found  that it should happened only with 2.6.23 kernel.
> 
>   The RDAC hardware handler is included (in a usable form) in the
>  kernel.org kernels starting from 2.6.23-rc4, if I recall correctly.
> 
>   I assume SuSE has simply backported it to their 2.6.16 kernel.  I know
>  Red Hat has done the same for RHEL5.1, at least.
> 
This is the case. RDAC mode work with SP1.

Occasionally documentation is correct :-)

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
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