TECHNICAL BULLETIN
                                Bulletin #1-257

Date:  December 6, 1989

                Clarification of the Disk Remirroring Procedure

The NetWare documentation for disk remirroring in a NetWare SFT environment is ambiguous.  As a result, users have encountered difficulty when replacing a failed disk and remirroring the new disk.  Many have attempted to establish the Hot Fix table and re-establish the mirrored pair using NETGEN.EXE.  

Keep the following information in mind as you remirror your drives:

	*	Each physical disk drive is assigned a disk drive number by the system.  For example, the disk drive located on channel 0, controller 0, drive 0 is designated  drive 0 by the system.  Channel 0, controller 0, drive 1 is designated drive 1. Channel 1, controller 0, drive 0 is designated drive 2, and so on.

	*	The first disk drive in the system will always be designated drive 0.  For example, if the file server does not have an internal disk drive, the disk located in channel 1, controller 0, drive 0, will be designated drive 0.

	*	When the file server shuts down a disk drive, the console displays a message that lists the failed drive number.  (If you do not record this number when the drive fails, you must use FCONSOLE to find the disk number.  Select the "Statistics" option.  Then select the "Disk Mapping" option to see which disk failed.)


The Remirroring Procedure

	If you need to remirror your disk drives, we recommend the following procedure (this procedure is outlined in the NetWare Console Reference, p. 3-42): 

	1)	In most cases, you must shut down the file server while replacing the failed disk drive.  If so, then issue the DOWN command at the console.

	2)	Turn off the file server or the disk subsystem that contains the failed disk.  

	3)	Replace the disk.  

	4)	If you have not previously run COMPSURF on the new disk, you must run COMPSURF now.  

	5)	After COMPSURF has been run on the disk, reboot the file server. 

	6)	Issue the following command at the file server console:

			REMIRROR <disk number>

		Replace <disk number> with the number of the disk that was removed.  

		The console will display a message telling the user that the disk is being remirrored.  It will also display a message when remirroring is done.  No further action is required by the user.