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CONFIG_SCSI_SCAN_ASYNC: Asynchronous SCSI scanning

General informations

The Linux kernel configuration item CONFIG_SCSI_SCAN_ASYNC:

• prompt: Asynchronous SCSI scanning
• type: bool
• depends on: CONFIG_SCSI
• defined in drivers/scsi/Kconfig
• found in Linux kernels: 2.6.20–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

The SCSI subsystem can probe for devices while the rest of the system continues booting, and even probe devices on different busses in parallel, leading to a significant speed-up.

If you have built SCSI as modules, enabling this option can be a problem as the devices may not have been found by the time your system expects them to have been. You can load the scsi_wait_scan module to ensure that all scans have completed. If you build your SCSI drivers into the kernel, then everything will work fine if you say Y here.

You can override this choice by specifying "scsi_mod.scan=sync" or async on the kernel's command line.

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