The Redall Command; The Dskana Command - Alpha Microsystems Eagle 250 Owner's Manual

Keeping Your Computer Happy

The REDALL Command

REDALL reads every block of data—or the number of blocks you choose—on the disk you specify, and
reports any errors. It does not change the data on your disk.
It is a good idea to run REDALL for each disk on your computer occasionally, possibly once a week.
That way, if any disk problems develop, you can be sure to detect them quickly.
To use REDALL:
1. To read all the blocks on a disk, enter REDALL followed by the device name (device names are
discussed in Chapter 5) of the disk you want to read. For example:
REDALL DSK2:
If you don't want REDALL to read all blocks on the disk, follow the disk specification with the
number of blocks you want read:
REDALL DSK2:1000
The command above tells REDALL to read the first 1000 blocks on DSK2:.
2. REDALL now tells you the number of blocks it is reading. For example:
REDALL DSK2:
Reading 13800 blocks
EXIT
3. REDALL ends when it finishes reading the blocks. If any errors occur, REDALL displays an
error message on your screen.

The DSKANA Command

Each file is stored in one or more disk blocks. AMOS keeps track of which disk blocks are currently used
in files and which are not by means of a special structure called a "bitmap." Each disk has its own
bitmap.
The DSKANA command is an important part of your disk maintenance routine. It compares the data on a
disk to the bitmap for the disk to make sure the bitmap is accurate. For example, if DSKANA finds a
disk block that is part of a file, but the bitmap shows the block not in use, DSKANA reports an error.
When DSKANA finishes analyzing the disk, it rewrites the bitmap, correcting any errors it found, unless
you tell it not to.
Use DSKANA frequently on all of your disks. It is a good practice to use DSKANA on every disk just
before you back up the files on that disk.
For more information on DSKANA, see the AMOS System Commands Reference Manual.
NEVER use DSKANA (unless you are using the /C option described below) while other users
are accessing the disk you are checking; doing so may damage the bitmap and the files on the
disk.
Only the system operator should use DSKANA. If you can't log to the system operator account,
Eagle 250 Owner's Manual, Revision 01
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