使用scsi cmd獲取設備最大鏈接速度

Question

我正在尋找可用於獲取設備最大鏈接功能的scsi命令。

我可以使用scsi MODE SENSE（頁19）讀取phy描述符並獲得鏈接速度嗎？但它與最大鏈接速度和協商鏈接速度有何不同？

Answer 1

據SPL-4，你很多使用SMP DISCOVER功能或SCSI MODE SENSE頁19h Protocol Specific Port，子頁面01h Phy Control And Discover。

對於鏈接速度，您應該使用NEGOTIATED LOGICAL LINK RATE。

[fge@el7 ~]$ sudo smp_discover /dev/bsg/expander-0\:0 
    phy 0:T:attached:[500015535990a300:00 t(SATA)] 3 Gbps 
    phy 1:T:attached:[500015535990a301:00 t(SATA)] 3 Gbps 
    phy 2:T:attached:[500015535990a302:00 t(SATA)] 1.5 Gbps 
    phy 3:T:attached:[500015535990a303:00 t(SATA)] 3 Gbps 
    phy 4:T:attached:[500015535990a304:00 t(SATA)] 3 Gbps 
    phy 5:T:attached:[500015535990a305:00 t(SATA)] 3 Gbps 
    phy 6:T:attached:[500015535990a306:00 t(SATA)] 3 Gbps 
    phy 7:T:attached:[500015535990a307:00 t(SATA)] 3 Gbps 
    phy 8:T:attached:[500015535990a308:00 t(SATA)] 3 Gbps 
    phy 9:T:attached:[500015535990a309:00 t(SATA)] 3 Gbps 
    phy 10:T:attached:[500015535990a30a:00 t(SATA)] 3 Gbps 
    phy 11:T:attached:[500015535990a30b:00 t(SATA)] 3 Gbps 
    phy 12:T:attached:[500015535990a30c:00 t(SATA)] 3 Gbps 
    phy 13:T:attached:[500015535990a30d:00 t(SATA)] 3 Gbps 
    phy 14:T:attached:[50014ee5aaab876f:01 t(SSP)] 3 Gbps 
    phy 15:T:attached:[500015535990a30f:00 t(SATA)] 3 Gbps 
    phy 16:S:attached:[5d4ae520995f8200:03 i(SSP+STP+SMP)] 3 Gbps 
    phy 20:T:attached:[500015535956633f:16 exp i(SMP) t(SMP)] 3 Gbps 
    phy 21:T:attached:[500015535956633f:17 exp i(SMP) t(SMP)] 3 Gbps 
    phy 22:T:attached:[500015535956633f:18 exp i(SMP) t(SMP)] 3 Gbps 
    phy 23:T:attached:[500015535956633f:19 exp i(SMP) t(SMP)] 3 Gbps 
    phy 24:D:attached:[500015535990a33e:24 V i(SSP) t(SSP)] 3 Gbps 

：最大鏈路速度 HARDWARE MAXIMUM PHYSICAL LINK RATE（物理限制）和 PROGRAMMED MAXIMUM PHYSICAL LINK RATE

這是使用SMP DISCOVER方式的示例（由PHY CONTROL功能配置）