IBM DS4300

IBM DS4300

[Gil]

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Hi list,

 

I have the following SAN hardware, and would be very grateful for any help:

 

SAN:

IBM DS4300 Storage Server with Turbo Option

 

HBA:

Fast Host Bus Adapter FC-2

 

Switch:

2 IBM TotalStorage SAN Switch H08 (8-portas)

 

Does multipath-tools support this hardware? How should I configure it?

 

I have tried to use multipath with it, using default configuration, but I am
having performance problems. What I would like to figure out is if
multipath-tools has anything to do with it.

 

Best regards,

    Gil


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Re: IBM DS4300

[Holger Smolinski]

Gil,

DS4300 has two modes:

AVT, which means only one path can be used at any point in time. Using an
alternate path will cause Automated Volume Transfer and add significant
latency.
RDAC, which means only one path can be used at any point in time. Using an
alternate path will cause an I/O error unless the volume has been migrated
manually or by a hardware_handler.

Best Regards
        Holger Smolinski
--
Dr. Holger Smolinski, Linux Technology Center, Linux on zSeries
Author of the '-t2'-Option
IBM Deutschland Entwicklung GmbH,Schönaicher Str. 220, 71032 Böblingen
FAX: +49-7031-16-3456, Tel. +49-7031-16-4652


                                                                           
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Hi list,

I have the following SAN hardware, and would be very grateful for any help:

SAN:
IBM DS4300 Storage Server with Turbo Option

HBA:
Fast Host Bus Adapter FC-2

Switch:
2 IBM TotalStorage SAN Switch H08 (8-portas)

Does multipath-tools support this hardware? How should I configure it?

I have tried to use multipath with it, using default configuration, but I
am having performance problems. What I would like to figure out is if
multipath-tools has anything to do with it.

Best regards,
    Gil--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel

Re: IBM DS4300

[Hannes Reinecke]

Holger Smolinski wrote:
> Gil,
> 
> DS4300 has two modes:
> 
> AVT, which means only one path can be used at any point in time. Using an
> alternate path will cause Automated Volume Transfer and add significant
> latency.
> RDAC, which means only one path can be used at any point in time. Using an
> alternate path will cause an I/O error unless the volume has been migrated
> manually or by a hardware_handler.
> 
And you _really_ will want to use AVT. RDAC mode is currently _not_
supported by multipath-tools.
For AVT mode you should use the pp_tpc prioritizer.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke			hare@suse.de
SuSE Linux Products GmbH		S390 & zSeries
Maxfeldstraße 5				+49 911 74053 688
90409 Nürnberg				http://www.suse.de