Flaw (Reserve Tracks) - Control Data Cyber 170 Series Operator's Manual

FLAW (RESERVE TRACKS)
The FLAW utility provides the capability to reserve tracks on any mass storage device
during normal system operation. Each entry identifies an area of mass storage thc;tt
is unusable (flawed area) and prevents the system from accessing it. Since the 881
disk pack normally contains flaw information in the utility sector. the FLAW utility
should be used on an 881 only to specify additional areas not currently in the utility
sector. Obtain flaw addresses from the customer engineer or the system analyst.
FLAWing tracks on mass storage devices is accomplished using the K display
(Figure 7-2). Note that all console entry is performed under DSD control. The
sequence - is as follows:
1. Call FLAW utility by typing
X.FLAW.
@
2. Bring K display to left console screen by typing
K,n.
@
where n is the control point number requesting the K display (message
REQUEST~~
K~:~DISPLAY appears at control point n on B, display).
3.
Specify mass storage device on which tracks are to be flawed. Enter
K.EQ=xx.
@
where xx is the EST ordinal of the mass storage device.
4. Enter flaws. A maximum of
20
octal flaw entries is allowed for each call to the
FLAW utility. In addition, there are three types of flaw entries that may be speci-
fied. The general format for K display entry is
K.xTK=ta.
@
where:
xTK Specifies type of flaw entry.
RTK
TTK
STK
Converts input physical address to a logical address and sets
track reservation table (TRT) to indicate that track is a
reserved. flawed track.
Input is the same as RTK but track reservation is toggled.
That is. if the track was previously not reserved. this entry
produces the same results as RTK.
If
the track was previ-
0usly reserved as a flawed track. that reservation is removed.
Performs the same function as RTK except that input address
is a logical address (no conversion required).
ta Specifies track address according to equipment format.
Axxxxxx
Cxxx, Txx, Sxx
Cxxx. Sxxxx
Block (track) address/10 8 for ECS (DE)
Track address for 844 Disk Storage Subsystem
(DI)
Track address for 841 Multiple Disk Drive
(MD)
Legend: xxx is octal number of address
(A).
cylinder (C),
track (T), or sector (S).
60435600 A 7-3