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假如系统是双控制器,那么通过不同的链路看到的同一个lun可能有两个不同的名字。
SCSI线缆备份系统,一个逻辑盘有两个设备名。盘柜已经给划分过LUN的显示了(LUN0,LUN1)
brw-r----- 1 bin sys 31 0x040000 Sep 5 2001 /dev/dsk/c4t0d0
brw-r----- 1 bin sys 31 0x040100 Sep 5 2001 /dev/dsk/c4t0d1
brw-r----- 1 bin sys 31 0x051000 Sep 5 2001 /dev/dsk/c5t1d0
brw-r----- 1 bin sys 31 0x051100 Sep 5 2001 /dev/dsk/c5t1d1
这是划分后的显示!因为dsk的产生是已经被通过pvcreate后才能看到的。
现在链路已经坏了一条(可以理解为控制器坏掉一个):所以用vgdisplay –v vg_sybase (看阵列上的LUN所划分的vg),只能发现有一条链路,并存在告警:
vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c4t0d0":
The specified path does not correspond to physical volume attached to
this volume group
vgdisplay: Warning: couldn't query all of the physical volumes.
LV Name /dev/vg_sybase/sybdev7
LV Status available/syncd
LV Size (Mbytes) 512
Current LE 128
Allocated PE 128
Used PV 1
--- Physical volumes ---
PV Name /dev/dsk/c5t1d0
vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c4t0d0":
The specified path does not correspond to physical volume attached to
this volume group
vgdisplay: Warning: couldn't query all of the physical volumes.
PV Status available
Total PE 6528
Free PE 0
Autoswitch On
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下面再以正常系统为例:
(该节点正常):vgdisplay –v vgsybase 看到如下:
LV Name /dev/vgsybase/sybdev6
LV Status available/syncd
LV Size (Mbytes) 2000
Current LE 500
Allocated PE 500
Used PV 1
--- Physical volumes ---
PV Name /dev/dsk/c5t0d0
PV Name /dev/dsk/c4t1d0 Alternate Link
PV Status available
Total PE 4050
Free PE 358
存在一条alternate link 呢!
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当然链路的增加需要你通过vgextend 加入的。 |
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