上周坏了块卡两条链路/dev/dsk/c44t0d3， /dev/dsk/c45t0d3断了，剩余 Alternate Link /dev/dsk/c42t0d3 ，/dev/dsk/c43t0d3并没有接管LUN，致使卷组宕掉！
请问如何使路径从主路径切换到备用路径，用什么命令测试冗余链路可用性？
--- Physical volumes ---

PV Name /dev/dsk/c44t0d3
PV Name /dev/dsk/c45t0d3 Alternate Link
PV Name /dev/dsk/c42t0d3 Alternate Link
PV Name /dev/dsk/c43t0d3 Alternate Link
PV Status available
Total PE 19197
Free PE 4480
Autoswitch On

DB-1#[/]pvdisplay /dev/dsk/c44t0d3
--- Physical volumes ---
PV Name /dev/dsk/c44t0d3
PV Name /dev/dsk/c45t0d3 Alternate Link
PV Name /dev/dsk/c42t0d3 Alternate Link
PV Name /dev/dsk/c43t0d3 Alternate Link
VG Name /dev/datavg
PV Status available
Allocatable yes
VGDA 2
Cur LV 5
PE Size (Mbytes) 16
Total PE 19197
Free PE 4480
Allocated PE 14717
Stale PE 0
IO Timeout (Seconds) default
Autoswitch On

DB-1#[/]pvdisplay /dev/dsk/c42t0d3
Device file path "/dev/dsk/c42t0d3" is an alternate path
to the Physical Volume. Using Primary Link "/dev/dsk/c44t0d3".
--- Physical volumes ---
PV Name /dev/dsk/c44t0d3
PV Name /dev/dsk/c45t0d3 Alternate Link
PV Name /dev/dsk/c42t0d3 Alternate Link
PV Name /dev/dsk/c43t0d3 Alternate Link
VG Name /dev/datavg
PV Status available
Allocatable yes
VGDA 2
Cur LV 5
PE Size (Mbytes) 16
Total PE 19197
Free PE 4480
Allocated PE 14717
Stale PE 0
IO Timeout (Seconds) default
Autoswitch On