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I recently installed Debian 6 in a VM on ESXi 4.1, but I noticed there is no /proc/scsi/scsi. Am I missing a module which provides that, or is there a different way of doing things like echo "scsi add-single-device 0 0 1 0">/proc/scsi/scsi?

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On recent kernels the /proc/scsi is being "migrated" to sysfs. You can recompile the kernel and enable the CONFIG_SCSI_PROC_FS: legacy /proc/scsi/ support to the scsi subsystem, or see if something under /sys/class/scsi_host and other sysfs dirs have what you need. The legacy support is a good route if you have many tools that rely on /proc/scsi to work.

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The new way of adding scsi devices is.

echo "$c $t $l" > /sys/class/scsi_host/host$h/scan

$h is the HBA number, $c is the channel on the HBA, $t is the SCSI target ID, and $l is the LUN.

If you don't know all of that, you can use wildcards.

echo "- - -" > /sys/class/scsi_host/host$h/scan

This is documented in the online storage management section of Red Hat's storage administration guide.

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