[OpenIndiana-discuss] Multipath IO Dual LSI 9211-8i

[John T. Bittner]

Marion,

Turning load-balance=none fixed it. Speeds back up to 500mbps

Thanks for all the help.

John Bittner


-----Original Message-----
From: Marion Hakanson [mailto:hakansom at ohsu.edu] 
Sent: Tuesday, February 08, 2011 3:03 PM
To: Discussion list for OpenIndiana
Subject: Re: [OpenIndiana-discuss] Multipath IO Dual LSI 9211-8i

john at xaccel.net said:
> Upgraded to openindiana oi_148 and now unit boots all the way and 
> seems to be ok but the performance of the array has dropped from 
> 500mps to 100mps. I am testing 13) 600gig 15k drives with 2 SSD's (log 
> and cache). When I do a test I do see both controllers accessing the 
> drives. Shouldn't one controller be the primary and the secondary just waiting?

With mpxio enabled, the default is to use round-robin load-balancing.
On our Dell MD1200 JBOD's this makes things very slow.  Try setting load-balance=none (in /kernel/drv/scsi_vhci.conf).  You can do this on a per-device basis, or system-wide.

Regards,

Marion



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