In Open MPI, we require physically different ("air gapped") subnets to
have different subnet ID's so that we can compute reachability
correctly. I don't know how to do it otherwise.
On Apr 3, 2008, at 10:40 AM, Tang, Changqing wrote:
You have a system, all HCAs have two ports, all port 1 are connected
to the first switch,
all port 2 are connected to the second switch, there is NO link
between the two switches.
We call this system has two physically separated fabrics. If you
have a bridge link
between the two switches, then it becomes a single fabric.
The same thing for multiple HCAs on nodes.
The problem is, from MPI side, (and by default), we don't know which
port is on which
fabric, since the subnet prefix is the same. We rely on system admin
to config two
different subnet prefixes for HP-MPI to work.
No vendor has claimed to support this.
--CQ
-----Original Message-----
From: Hal Rosenstock [mailto:[EMAIL PROTECTED]
Sent: Thursday, April 03, 2008 9:32 AM
To: Tang, Changqing
Cc: Erez Zilber; Tziporet Koren; ewg@lists.openfabrics.org;
[EMAIL PROTECTED]
Subject: RE: [ofa-general] Re: [ewg] OFED March 24 meeting
summary on OFED 1.4 plans
CQ,
On Thu, 2008-04-03 at 14:27 +0000, Tang, Changqing wrote:
Can we address multiple-fabrics (physically separated) support ?
Can you elaborate on what you mean by "physically separated" ?
-- Hal
--CQ Tang
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Erez
Zilber
Sent: Thursday, April 03, 2008 8:51 AM
To: Tziporet Koren
Cc: ewg@lists.openfabrics.org; [EMAIL PROTECTED]
Subject: [ofa-general] Re: [ewg] OFED March 24 meeting summary on
OFED 1.4 plans
*OFED 1.4:*
1. Kernel base: since we target 1.4 release to Sep we
target the
kernel base to be 2.6.27
This is a good target, but we may need to stay with
2.6.26 if the
kernel progress will not be aligned.
2. Suggestions for new features:
* NFS-RDMA
* Verbs: Reliable Multicast (to be presented at Sonoma)
* SDP - Zero copy (There was a question on IPv6 support
- seems no
one interested for now)
* IPoIB - continue with performance enhancements
* Xsigo new virtual NIC
* New vendor HW support - non was reported so far (IBM
and Chelsio
- do you have something?)
* OpenSM:
o Incremental routing
o Temporary SA DB - to answer queries and a heavy
sweep is done
o APM - disjoint paths (?)
o MKey manager (?)
o Sasha to send more management features
* MPI:
o Open MPI 1.3
o APM support in MPI
o mvapich ???
* uDAPl
o Extensions for new APIs (like XRC) - ?
o uDAPL provider for interop between Windows & Linux
o 1.2 and 2.0 will stay
As I wrote in an earlier discussion (~2 months ago), we
plan to add
tgt (SCSI target) with iSCSI over iSER (and TCP of
course) support. The git tree for tgt already exists on the ofa
server.
Erez
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Jeff Squyres
Cisco Systems
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