[CentOS] Hi ALL!!!

I have a one problem with Raid controller Tekram TR-822...
I'm using dmraid software:
root at ns1: / $ dmraid -r
/dev/sda: sil, "sil_ajacddafagff", mirror, ok, 156299440 sectors, data@ 0
/dev/sdb: sil, "sil_ajacddafagff", mirror, ok, 156299440 sectors, data@ 0

When I'm start dmraid -ay:
root at ns1: / $ dmraid -ay
RAID set "sil_ajacddafagff" was not activated

And I see from dmesg:
device-mapper: table: 253:0: mirror: Device lookup failure
device-mapper: ioctl: error adding target to table

My system centos
My kernel 2.6.18-128.1.10.el5.centos.plus