[OpenIndiana-discuss] Multiple devices appearing as one behind SAS expander

[Dan Vatca]

It is possible that all devices show up as having the same WWN, thus the illumos driver cannot tell them apart, and assumes they are one and the same.
I've seen this with SSDs from various manufacturers, but only for "consumer" drives. The manufacturer's response was that those SSDs were supported only one per system, and where you needed more than one you had to go with the enterprise version.

On 21 Mar 2013, at 15:13, "Schweiss, Chip" <chip at innovates.com> wrote:

> I have four 480GB SSDs I'm trying to re-add to my pool as L2ARC.   They
> were all connected internally on the server, but now I have a dedicated SAS
> JBOD for the 2 1/2 SSDs in the system.   The JBOD is a SuperMicro 2U with
> LSI SAS2X36 expander.
> 
> The SSDs are are all showing up as a single device: c11t0000120000000000d0s0
> 
> They are incorrectly identified as the same device by the multipathadm:
> 
> mutipathadm list lu:
> 
>        /dev/rdsk/c11t0000120000000000d0s2
>                Total Path Count: 4
>                Operational Path Count: 4
> 
> Not sure where napp-it gets its information for it's controller view but
> this is how it reports them:
> 
> c14::w5003048001d91b4e,0   connected   configured   unknown   Client
> Device: /dev/dsk/c11t0000120000000000d0s0(sd75) disk-path n /devices/pci at 0
> ,0/pci8086,340e at 7/pci1000,30d0 at 0/iport at f000:scsi::w5003048001d91b4e,0
> c14::w5003048001d91b4f,0   connected   configured   unknown   Client
> Device: /dev/dsk/c11t0000120000000000d0s0(sd75) disk-path n /devices/pci at 0
> ,0/pci8086,340e at 7/pci1000,30d0 at 0/iport at f000:scsi::w5003048001d91b4f,0
> c14::w5003048001d91b5a,0   connected   configured   unknown   Client
> Device: /dev/dsk/c11t0000120000000000d0s0(sd75) disk-path n /devices/pci at 0
> ,0/pci8086,340e at 7/pci1000,30d0 at 0/iport at f000:scsi::w5003048001d91b5a,0
> c14::w5003048001d91b5b,0   connected   configured   unknown   Client
> Device: /dev/dsk/c11t0000120000000000d0s0(sd75) disk-path n /devices/pci at 0
> ,0/pci8086,340e at 7/pci1000,30d0 at 0/iport at f000:scsi::w5003048001d91b5b,0
> 
> How do I break this and get OI to see these as 4 independent devices?
> 
> Thank you,
> -Chip
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