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

[Guenther Alka]

This is a not too rare problem with current SSDs
(The manufacturers haven't recognised the importance of individual WWNs)

Even my distributor (winkom) specialized in enterprise SSD listed SSD with
individual WWN only after my request.

What you can do:
disable multipath

What you should do:
do not use them together with controllers that identify disks based on WWN
(ex. LSI SAS2 controller in IT mode)  or you may not be able to identify 
in case of problems.


Gea
napp-it.org

>
> neat problem.
> generally the wwn is stamped on the drive. are they all marked with the same wwn?
>
> who makes the drives? ocz? sandisk?
>
> Sent from Jasons' hand held
>
> On Mar 21, 2013, at 6:13 AM, "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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>> OpenIndiana-discuss at openindiana.org
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