[ewg] Re: SRP HA dm_multipath testing and questions

[Ishai Rabinovitz]

Chieng Etta wrote:
> 
> Scott Weitzenkamp (sweitzen) wrote:
>> I've been testing SRP HA and dm_multipath with:
>> - RHEL4 U3 x86_64, Cisco FC Gateway, and Sun T4 RAID
>> - RHEL4 U3 x86_64, Cisco FC Gateway, and Sun 3510 RAID
>> - SLES10 x86_64, Cisco FC Gateway, and 3 JBODs
>>  
>> On RHEL4, I edited /etc/multipath.conf, ran "chkconfig multipathd on", 
>> then rebooted.  On SLES 10, I ran "chkconfig boot.multipath on" and 
>> "chkconfig multipathd on", then rebooted.  Ishai, I don't seem to need 
>> 91-srp.rules, are you using the boot.multipath and multipathd scripts?
> 
> On RHEL4 you really do not need 91-srp.rules and it is not used (see
> /etc/init.d/openibd)
> On SLES10 I was sure that you need it. I checked it, and you are correct. I
> don't see how it does it, but it seems that when using boot.multipath there
> is no need for 91-srp.rules. I will check it more deeply and change
> documentation and openibd script accordingly. 
> 
> [EC] I just verified it on SLES10 x86_64.  The multipath worked fine by
> using boot.multipath without 91-srp.rules.
> 
In one of Novell's documents (SLES 10 Storage Administration Guide for EVMS - In section 5 Managing Multipath I/O for Devices http://www.novell.com/documentation/sles10/index.html?page=/documentation/sles10/stor_evms/data/multipathing.html) it says in subsection 5.7 that after a new target was discovered there is a need to actively execute multipath. (As I understand it from the document this is true even after boot.multipath is running) 

Experiments in my environment also indicates that after executing boot.multipath, SRP HA is working also without 91-srp.rules, but after reading this document I'm even more confused.



> Ishai, in the SRP release notes - section 6, srp_daemon a., the first line
> should be changed to '"srp_daemon -a -o" is equivalent to "ibsrpdm"'.
> 
> 
Thanks, However Scott already noticed that and I already fixed it. You will see it in the next documentation version.