[openfabrics-ewg] udev on RHEL

[Scott Weitzenkamp (sweitzen)]

Doug, what udev does RHEL5 beta have?  Any plans to upgrade udev for
RHEL4 U5?
 
Scott


________________________________

	From: openib-general-bounces at openib.org
[mailto:openib-general-bounces at openib.org] On Behalf Of Ishai Rabinovitz
	Sent: Tuesday, October 17, 2006 5:36 AM
	To: Sharma, Karun 
	Cc: openfabrics-ewg at openib.org; openib-general at openib.org
	Subject: Re: [openib-general] [openfabrics-ewg] OFED 1.1 release
schedule
	
	
	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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