Microsoft KB Archive/67602

Setting Up Disk Mirroring in OS/2 LAN Manager Version 2.00 ID Number: Q67602

2.00 OS/2

Summary:

The information below describes a step-by-step procedure of how to set up disk mirroring on your OS/2 LAN Manager version 2.00 machine.

Before beginning this procedure, it is important to note that your disk device driver, either DISK01.SYS (ISA or EISA bus) or DISK02.SYS (MCA bus), must support fault tolerance. If you have a question as to whether your hard disk drive is supported, query on the following words for more information:

eisa and hard and three and o_olanman

This procedure is listed below:

  Start PMFDISK from the Utilities menu. Two drive icons should be present underneath the action bar indicating that a physical disk 1 and a physical disk 2 exist on the machine. Two physical drives are required for both disk mirroring and duplexing (duplexing also requires a second controller).   Check the type, size, and percent of the disk space used by the first partition of physical disk 1. If the percentage of disk space being used is 100 percent or the type is FAT, go to step 3; otherwise go to step 4.   OS/2 version 1.21 does not allow the primary partition of a machine’s boot drive (physical disk 1) to be mirrored, nor will it mirror FAT partitions. If either of these two cases is true of your system, you will need to repartition your boot drive by performing the following steps:   Back up all essential files to disk or tape.   Boot off of the OS/2 install floppy disk. Press the ESC key at the initial screen. Type “FDISK /d” and respond with “Y” to the question that is displayed. Note: This step is essential because after OS/2 has been installed the first time, all future installs of OS/2 will use the same partition size. You will not be prompted to change the size unless you are installing OS/2 for the first time, or the primary partition has been deleted prior to the installation.   Reinstall OS/2, being careful to select a primary partition that is smaller than the whole of the physical disk 1 (you should probably leave about 25 MB of disk space for this partition for OS/2 LAN Manager and OS/2, unless you choose to redirect the SWAPPER.DAT file elsewhere). Choose “Yes” when prompted to format the partition as HPFS.    Once your partition sizes are set correctly, start PMFDISK and create an extended partition on the primary disk 1. DO NOT create a logical drive for this partition. </li>  Select physical drive 2 and create a primary and extended partition that matches the first physical drive. DO create a logical drive for this partition. Your drives should now look like the following:

Drive 1
Partition Information

Drive 2
Partition Information

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Logical Drive Information E: YY YY% If Drive D reads HPFS or FAT rather than PRI OS/2, it means that the primary partition has been formatted. Exit PMFISK and reboot to have the partition changes take effect. </li>  Run FTSETUP from an OS/2 command prompt. Choose Config Mirror drives. Select Logical Drive E and respond affirmatively to all the OK prompts. Reboot your computer when the following message appears: Changes have been made to the disk partition table. You must restart the computer for these changes to take effect. </li>  If everything is correct, FTSETUP will automatically be loaded from your STARTUP.CMD file during the system boot and prompt you to format Logical Drive E. Choose OK. Verify the drive status from Config View drive status. Exit FTSETUP and the STARTUP.CMD file will proceed normally. FTSETUP is automatically REMarked out after the STARTUP.CMD file completes. </li>  Setup of Drive Mirroring is now complete. Per the instructions above, the drives will now mirror in the following direction

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<ul> C * * D   * *  ********* ********** * * *   * * *</li> Mirror * * *</li> of E * <—-* E   * *   * *  ********* **********</li></ul> </li></ol>