[ofa-general] SRP Failover

[Scott Weitzenkamp (sweitzen)]

You need to configure Device Mapper Multipath or some other multipathing
software to get HA.  What OS are you running?
 
Steps for RHEL are:
 
1) Edit /etc/multipath.conf and comment out devnode_blacklist (RHEL4) or
blacklist (RHEL5) entry.
2) Run "chkconfig multipathd on".
3) Reboot.
4) After reboot, /dev/mapper should be populated with mutipath block
device entries.
5) You can run "multipath -l" to view the multipath status.
 
Steps for SLES10 are similar:
 
1) Run "chkconfig boot.multipath on".
2) Run "chkconfig multipathd on".
3) Reboot.
4) After reboot, /dev/mapper should be populated with mutipath block
device entries.
5) You can run "multipath -l" to view the multipath status.
 
You use the /dev/mapper block devices, not /dev/sd* block devices.
 
Scott Weitzenkamp
SQA and Release Manager
Server Virtualization Business Unit
Cisco Systems
 


________________________________

	From: general-bounces at lists.openfabrics.org
[mailto:general-bounces at lists.openfabrics.org] On Behalf Of PN Lai
	Sent: Tuesday, June 26, 2007 2:48 AM
	To: general at lists.openfabrics.org
	Subject: [ofa-general] SRP Failover
	
	

	Hi all,

	 

	I'm testing the SRP HA functions, but I have some questions.

	I use 2 IB cables to connect the initiator and 1 IB cables to
connect to the storage.

	 

	I installed the OFED-1.2, enable the "SRP_LOAD=yes" and
"SRPHA_ENABLE=yes" in openib.conf.

	After reboot, it discovers 2 targets /dev/sdbX and /dev/sdcX. 

	 

	However, I check the /var/log/srp_daemon.log, it shows:

	....

	26/05/07 17:42:57 : bad MAD status (110) from lid 257

	26/05/07 17:43:30 : No response to inform info registration

	26/05/07 17:43:30 : Fail to register to traps, maybe there is no
opensm running on fabric

	....

	 

	But the opensm is running in both machines. I don't know whether
it is normal, or should it only discover a single target?

	 

	Now, my question is that if I mount the /dev/sdbX and write data
to it, and then remove 1 of the initiator cable, how the /dev/sdcX will
replace the /dev/sdbX so that I can continue to write the data?

	 

	Do I need to configure some extra files?

	 

	Thanks for reply.

	 

	PN

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