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i am having trouble using SCSI device on Linux.

In fact, i don't want that they can be detected until I use the following command : 

echo "0 0 0" > /sys/class/scsi_host/hostX/scan

By detected i mean that there is no device in /sys/class/scsi_device other than my system drive (where my distro is). That also mean there is no new devices in /dev/sdX.

This work fine on two of my machines (ofc the dev one), but the other don't. The setup of the machine are exactly the same (checked history..). On BIOS, i didn't find any difference.

Any advise to give me with this?

Thanks you for reading!

EDIT: My computers are working on Debian 6.0 server Edition.

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1 Answer

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Strange request. I'm not sure how your other systems performed this way to begin with. The only explanation I can think of is the disks were on a separate HBA and the driver wasn't loaded. The closest feature I could find that addresses your need is scsi_mod.scan=none. Though I think that will prevent all drives from being scanned, even your root ones.

I guess you could start with no scanning, and then customize your initrd to only scan the HBA/target that has your OS, wait, and then continue booting. Sounds like a lot of work and error prone, what's the payoff for this configuration?

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Well i solved this using another way, i just considered that they are auto detected, if not i try auto detection then leave in error. The payoff here is quite specific to my work. Different machine , different bash is quite annoying, so i tried to get the same env. So if i can't with two exact computer, i will have some trouble in the future maintaining that. Anyway thanks for answer. – Cédric COPY Jan 26 at 11:05
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