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[linux-lvm] dmsetup do not know sda*



1.dmsetup ls
vg_spare-lv_spare       (253, 0)
 
why no sda*  device map???
2 i install multipath,and configure
but multipath -ll   show nothing
---dmesg---
device-mapper: table: 253:1: multipath: error getting device
device-mapper: ioctl: error adding target to table
device-mapper: table: 253:1: multipath: error getting device
device-mapper: ioctl: error adding target to table
device-mapper: table: 253:1: multipath: error getting device
device-mapper: ioctl: error adding target to table
device-mapper: table: 253:1: multipath: error getting device
device-mapper: ioctl: error adding target to table
device-mapper: table: 253:1: multipath: error getting device
device-mapper: ioctl: error adding target to table
device-mapper: table: 253:1: multipath: error getting device
device-mapper: ioctl: error adding target to table
device-mapper: table: 253:1: multipath: error getting device
device-mapper: ioctl: error adding target to table
device-mapper: table: 253:1: multipath: error getting device
device-mapper: ioctl: error adding target to table
--------
what i should do?
 
thanks



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