mirroring

[Randy Bush]

i am running 4.8-stable with

    ahc1: <Adaptec aic7899 Ultra160 SCSI adapter> port 0x9400-0x94ff \
          mem 0xe2202000-0xe2202fff irq 11 at device 5.1 on pci2
    aic7899: Ultra160 Wide Channel B, SCSI Id=7, 32/253 SCBs

and

    da0: <SEAGATE ST336607LC 0005> Fixed Direct Access SCSI-3 device 
    da0: 160.000MB/s transfers (80.000MHz, offset 63, 16bit), \
         Tagged Queueing Enabled
    da0: 35003MB (71687372 512 byte sectors: 255H 63S/T4462C)

as i can not afford a hard drive down, i want to add a second identical
drive and mirror.

do i use vinum?  ccd?  some hardwhere option?

randy