Hot adding a storage device with sdiadd

To hot add a SCSI storage device on a system:

1. Choose a SCSI id for the device, making sure it does not conflict with any existing devices on the SCSI bus.

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   NOTE: Failure to do this correctly will crash the system. This is a hardware limitation that cannot be addressed in software.

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2. Ensure that adding the device to the system will maintain proper SCSI bus termination.

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   NOTE: Failure to do this correctly will crash the system. This is a hardware limitation that cannot be addressed in software. You can, however, simplify the problem by never having any termination on a device. Instead, terminate the end of the SCSI bus cable.

   We recommend that the device not provide termination power. Most devices have a jumper or switch to disable termpower.

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3. Type
   
   /sbin/sdiadd

   with optional arguments that allow you to specify which controller, bus, or target the device will find. sdiadd will quiet the SCSI bus and notify you when it is safe to add the device to the system. This reduces the short-term disruption of performance on the system. See sdiadd(1M) for information about options.

4. Physically attach the device to the SCSI bus.

5. Press <Enter> to inform sdiadd that the device has been added and normal SCSI bus operation may resume.

6. If you added a hard disk:

   • If you added a fresh (without filesystems) hard disk you need to set it up and create filesystems using the diskadd command. See ``Adding hard disks'' or the diskadd(1M) manual page.

   • If you moved a hard disk from a UnixWare system, and the disk already has filesystems, edit /etc/vfstab to reflect the new filesystem configuration.