--- Douglas Gilbert <dougg@xxxxxxxxxx> wrote:
> In lk 2.6.20-rc2 (and probably earlier) the phy_identifier
> attribute in the /sys/class/sas_device/end_device-*
> directory is showing the wrong end of the point to point
> link.
>
> Phy identifiers on (dual ported) SAS disks are typically
> 0 and 1. For SATA disks the phy identifier should be 0.
>
> # lsscsi
> [4:0:0:0] disk ATA ST3160812AS D /dev/sda
> [4:0:1:0] disk SEAGATE ST336754SS 0003 /dev/sdb
> # lsscsi -t
> [4:0:0:0] disk sas:0x500605b0000033e6 /dev/sda
> [4:0:1:0] disk sas:0x5000c500005208ee /dev/sdb
> # lsscsi -tL 4:0:1:0
> [4:0:1:0] disk sas:0x5000c500005208ee /dev/sdb
> transport=sas
> initiator_port_protocols=none
> initiator_response_timeout=10000
> I_T_nexus_loss_timeout=1744
> phy_identifier=7
> ready_led_meaning=1
> sas_address=0x5000c500005208ee
> target_port_protocols=ssp
>
> # smp_discover -mb
> Device <500605b0000033ef>, expander (only connected phys shown):
> phy 5:T:attached:[500605b00006f260:03 i(SSP+STP+SMP)] 3 Gbps
> phy 6:T:attached:[500605b0000033e6:00 t(SATA)] 1.5 Gbps
> phy 7:T:attached:[5000c500005208ee:01 t(SSP)] 3 Gbps
>
>
> The SATA and SAS disks are connected via an expander which
> lets me look at sysfs for 4:0:1:0 and the expander configuration
> with smp_discover. The port in use on the SAS disk has the
> address: 5000c500005208ee . The expander says that cable is
> attached to phy 1 which agrees with what I can see. However
> sysfs reports "phy_identifier=7" which is wrong (and happens
> to be the attached phy_id seen from the SAS disk).
>
> Both aic94xx and mptsas drivers do the same thing so it
> looks like a SAS transport problem.
Have you tested this with the SAS Stack as I distribute it?
Luben
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