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