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How to skip/exclude one SCSI bus from scanning during boot?

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http://unix.stackexchange.com – A "Linux debian 3.2.0-0.bpo.3-amd64 #1 SMP Thu Aug 23 07:41:30 UTC 2012 x86_64 GNU/Linux" system has at least 5 SCSI hosts: root@debian:~# ls /sys/class/scsi_host host0 host1 host2 host3 host4 root@debian:~# cat /sys/class/scsi_host/host0/proc_name mpt2sas root@debian:~# cat /sys/class/scsi_host/host1/proc_name ata_piix root@debian:~# cat /sys/class/scsi_host/host2/proc_name ata_piix root@debian:~# cat /sys/class/scsi_host/host3/proc_name ata_piix root@debian:~# cat /sys/class/scsi_host/host4/proc_name ata_piix The mpt2sas SCSI bus has 32 drives attached. On boot (after a reboot) the (HowTos)