[openib-general] [openfabrics-ewg] OFED 1.1 release schedule

[Ishai Rabinovitz]

Hi,

Let me first explain why the current OFED release does not support
SRP-HA on RHEL4.

SRP-HA is using Device Mapper multipath.

Multipath prerequisites include udev of higher version than 050.

RHEL4 distributions includes udev 039. udev is an important part of the
distribution and I do not think that users will be ready to upgrade it
in order to have SRP-HA.

To my best knowledge the main reason that multipath needs at least udev
050 is because it uses the RUN option (This option executes its given
parameter after the device exist). Multipath uses the RUN option to
execute kpartx that handles the partitions of the new device. SRP-HA
also uses the RUN option to execute the multipath command.

I have an idea on how to overcome this problem. I want to implement a
srp-multipath-daemon. This daemon will get kpartx and multipath requests
using a shared message queue. The udev will use the PROGRAM option (That
executes its given parameter immediately - before the device exist) to
post request to this shared message queue and return immediately. The
daemon will wait for the device to create and only than it will execute
the commands.

In any case this technique will not be a part of the coming OFED
release.

Ishai

 

 

-----Original Message-----
From: Sharma, Karun [mailto:ksharma at silverstorm.com] 
Sent: Tuesday, October 17, 2006 5:11 AM
To: Tziporet Koren; Open Fabrics
Cc: openib
Subject: RE: [openfabrics-ewg] OFED 1.1 release schedule

 

The plan is OK with Silverstorm.

I have a question though. What are the plans to support SRP-HA feature
on RHEL4 kernels ?

 

Thanks

Karun

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