Emergency boot floppy set and mirrored root disks

If you have a mirrored root configuration, there are several important considerations when creating and using an emergency boot floppy set:

• If you create a mirrored root filesystem, create a new emergency boot floppy set immediately. If possible, create a system-specific Boot Disk rather than a generic one.

• If you must create a generic Boot Disk (when the system-specific kernel does not fit on a floppy disk), then only the original piece of the mirror will open when the system is booted. You cannot use this Boot Disk on another system with a mirrored root.
  

• When using the emergency boot floppy set to boot the system, use this bootstring instead of just pressing <Enter> at the Boot prompt:
  
  defbootstr fd(60)unix.Z root=vdisk(1) swap=none dump=none

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  WARNING: If root is not directed to vdisk(1), then the two halves of the mirror will become out-of-date, which could corrupt the filesystem when the machine is next booted from the hard disk.

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