ID Number: Q76258
2.00
OS/2
Summary:
The application note below describes how to set up disk mirroring on
an OS/2 LAN Manager version 2.0 machine.
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LM0420: SETTING UP DISK MIRRORING IN OS/2 LAN MANAGER
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Revision Date: 7/91
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| Copyright 1991 Microsoft Corporation. All Rights Reserved. |
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Introduction
============
This application note describes a step-by-step procedure for setting
up disk mirroring on an OS/2 LAN Manager version 2.0 machine.
Before beginning this procedure, it is important to note that the 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, contact LAN Manager Product
Support.
Setting Up Mirroring
====================
1. From the Desktop Manager's Utilities menu, choose the PM fixed disk
utility (PMFDISK). Two drive icons should be present below 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 percentage 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 must repartition your boot drive by performing the
following steps:
a. Back up all essential files to disk or tape.
b. Boot off the OS/2 installation floppy disk. Press the ESC key at
the initial screen. Type "fdisk /d" (without the quotation
marks) 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 installations 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 unless 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 physical disk 1 (leave about 25 MB
of disk space available for this partition for both OS/2 LAN
Manager and OS/2, unless the SWAPPER.DAT file is redirected
elsewhere). Choose Yes when prompted to format the partition as
HPFS.
4. Once the partition sizes are set correctly, start the PM fixed disk
utility and create an extended partition on 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. The drives should now look like the following:
Drive 1
-------
Partition Information
Partitions Status Type Size in Percent of Disk
MBytes
---------- ------ ---- ------- ---------------
C: Startable HPFS XX XX%
Not Startable EXT OS/2 YY YY%
Drive 2
-------
Partition Information
Partitions Status Type Size in Percent of Disk
MBytes
---------- ------ ---- ------- ---------------
D: Not Startable PRI OS/2 XX XX%
Not Startable EXT OS/2 YY YY%
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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 the PM fixed disk
utility and reboot to have the partition changes take effect.
6. Run Ftsetup from an OS/2 command prompt. From the Config menu,
choose Mirror Drive(s). Select logical drive E and respond
affirmatively to all the OK prompts. Reboot the 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
the STARTUP.CMD file during the system boot and will prompt you to
format logical drive E. Choose OK. Verify the drive status with the
View Drive Status command (on the Config menu). Exit Ftsetup and
the STARTUP.CMD file will proceed normally. Ftsetup is
automatically REMarked out after the STARTUP.CMD file completes.
8. Disk mirroring setup is now complete. The drives will now mirror in
the following direction:
+---------+ +---------+
| | | |
| c | | d |
| | | |
| | | |
|---------| |---------|
| | | |
| Mirror |<-----| e |
| | | |
| | | |
+---------+ +---------+
Additional reference words: 2.00