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:
1. 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).
2. 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.
3. 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:
a. Back up all essential files to disk or tape.
b. 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.
c. 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.
4. 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.
5. 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
Partitions Status Type Size in MBytes Percent of Disk
-----------------------------------------------------------
C: Startable HPFS XX XX%
Not Startable EXT OS/2 YY YY%
Drive 2
-------
Partition Information
Partitions Status Type Size in MBytes Percent of Disk
-----------------------------------------------------------
D: Not Startable PRI OS/2 XX XX%
Not Startable EXT OS/2 YY YY%
------------------------------------------------------------
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.
6. 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.
7. 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.
8. Setup of Drive Mirroring is now complete. Per the instructions
above, the drives will now mirror in the following direction
********** **********
* C * * D *
* * * *
********** **********
* * * *
* * * *
* Mirror * * *
* of E * <----* E *
* * * *
* * * *
********** **********