[OpenIndiana-discuss] sas multipath

[Rocky Shek]

Randy,

1) By default, 6G HBA(mpt_sas) is already MPxIO enabled.  You no longer need to use stmsboot to set it like with 3G HBA
2) yes, logicblock will be faster
3) please make sure your JBOD have dual expander
4) FYI, we normally use 9205-8e or 9207-8E 
5)  the following link is what we do the cable
http://dataonstorage.com/images/PDF/Solutions/NX2260-S2%20Unifiled%20Storage%20System.pdf
6) you may use "mpathadm list lu" to confirm you have dual path.

I tested it in the past and working but not on OIa7  

Rocky
-----Original Message-----
From: Randy S [mailto:sim.ple at live.nl] 
Sent: Wednesday, February 06, 2013 4:03 AM
To: openindiana-discuss at openindiana.org
Subject: [OpenIndiana-discuss] sas multipath


Hi all,

I have a test system running with OIa7, very much ram, 2 LSI SAS 9207-4i4e hba's, 1 sm jbod containing seagate 3Tb sas drives. 

I have enabled the multipathing with stmsboot and set it to use logical-blocksize, since round-robin symmetric-option isn't functioning.

During tests I can see that the system sees the two path's  with mpathadm and simple dd tests show that all disks are all accessed at almost maximum speed with minimum latency according to iostat. 
We started to test with 4 sas disks in 2 striped mirrors. 

All good, but shouldn't it be possible to pull one of the sas cables without any disruption to the storage, forcing it to use only one path? (this way simulating a broken hba).
When we do this, the whole system grinds to a screeching halt, being almost unresponsive.

What am I doing wrong. Maybe somebody can point in in the right direction to troubleshoot.

Rgrds,

Randy





 		 	   		  
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