System Administration
Page 5-11
AM-6060 Computer Owner's Manual, Rev. 00
3. REDALL now tells you the number of blocks it is reading. For example:
REDALL DSK2:
RETURN
Reading 13800 blocks
EXIT
4. REDALL ends when it finishes reading the blocks. If any errors occur, REDALL displays the
appropriate error message on your screen.
The DSKANA Command
The DSKANA command is an important part of your disk maintenance routine. DSKANA analyzes the
data on a specified disk and reports lost and mislinked disk blocks, inconsistent block counts, and other
file errors.
Each file on the disk 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.
DSKANA compares the information in the bitmap with the actual data on 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 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 System Commands Reference Manual.
NEVER use DSKANA (unless you are using the /C option described below) while other users
are accessing the specified disk; doing so may damage the bitmap and the files on the disk.
To use DSKANA, follow these steps:
1. Log into OPR: by typing:
LOG OPR:
RETURN
2. Type
DSKANA
followed by the device name of the disk you want to analyze and press
RETURN
.
For example, to analyze DSK1:, type:
DSKANA DSK1:
RETURN
You now see:
[Begin analysis of DSK1:]
As DSKANA checks the disk, it displays the disk account numbers. When it finishes, it displays
the results of its analysis. For example:
