커널버젼은 2.2.12 이구요.
 기존에 스카시 하드디스크가 두개 붙어 있었거든요.
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(scsi0) <Adaptec AHA-294X Ultra2 SCSI host adapter> found at PCI 17/0
(scsi0) Wide Channel, SCSI ID=7, 32/255 SCBs
(scsi0) Downloading sequencer code... 374 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.20/3.2.4
       <Adaptec AHA-294X Ultra2 SCSI host adapter>
scsi : 1 host.
(scsi0:0:0:0) Synchronous at 80.0 Mbyte/sec, offset 15.
  Vendor: SEAGATE   Model: ST39102LW         Rev:0006
  Type:  Direct-Access                      ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
(scsi0:0:1:0) Synchronous at 80.0 Mbyte/sec, offset 31.
  Vendor: QUANTUM   Model: VIKING II 9.1WLS  Rev: 5520
  Type:  Direct-Access                      ANSI SCSI revision: 02
Detected scsi disk sdb at scsi0, channel 0, id 1, lun 0
(scsi0:0:5:0) Synchronous at 5.0 Mbyte/sec, offset 16.
  Vendor: TEAC      Model: CD-ROM CD-532S    Rev:1.0A
  Type:  CD-ROM                             ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi0, channel 0, id 5, lun 0
sr0: scsi3-mmc drive: 0x/0x caddy
Uniform CDROM driver Revision:2.56
SCSI device sda: hdwr sector= 512 bytes. Sectors= 17783240 [8683 MB] [8.7 GB]
 sda: sda1 sda2 < sda5 sda6 sda7 sda8 sda9 sda10 >
SCSI device sdb: hdwr sector= 512 bytes. Sectors= 17836668 [8709 MB] [8.7 GB]
 sdb: sdb1
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 위와 같이....
 그런데 새로 스카시하드디스크를 추가했는데....( IBM 18.3G / SCSI Ultra 160 )
스카시콘트롤러에선 잘 인식하는데
부팅이 안되요..
기존에 있던건 넘어가는데 새로붙인 하드를 찾는 대목에선 
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SCSI bus is being reset for host 0 channel 0
SCSI host 0 abort (pid 4) timed out - tying harder
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 이런 메세지만 계속 반복하고 더이상 부팅이 진행되질 않습니다.
 이유가 뭘까요?
 경험있으신분들 답변좀 부탁합니다.