1. DASD Explorer Training
2014

2. DASD Explorer
“Collect DASD information and save into historical views”

3. Data Source Record Description RMF 70 CPU Activity RMF 73
Channel – channel path activity
RMF 74.1
Device – Front-end response times
RMF 74.5
Cache - Activity inside the storage
RMF 78.3
LCU – Hyper-PAV and LCU activity
DCOLLECT “V”
DASD occupation **
DASD configuration discovery

4. Historical views Target Table name Description CACHE History cacheHist
Storage Group and SSID activity: cache hits, response times
CACHE Volume History
cacheVolumes
Volume level cache activity
Channel CEC History
chpCec
CEC totals, zHPF activity
Channel Lpar History
chpLpar
CHPID activity per LPAR
Device History
devHist
Storage Group and SSID: SSCH, response times per LPAR
Device Volume History
devVolumes
Volume level activity
LCU History
lcuHist
Hyper-PAV and LCU activity
LCU Config History
cfgLcuHist
Configuration matrix
Volume Config History
cfgVolHist
Volume configuration matrix
Volume History
volHist
Volume occupation

5. Cache Activity Activity inside the box (storage array)
Fields
Storage Array
Storage Group
SSID
Activity inside the box (storage array)
The counters accounts the usage per all LPAR’s
¼ of Cache Volumes space

6. Cache Activity counters
Counters available:
XRC = Asynchronous replication counters
zHPF = Hiper FICON activity

7. Cache operations Cache operations:
%random read hits and %random read misses,
%random writes,
%sequential reads and %sequential writes

8. IOPS x Response time
IO activity per hour of day: average, minimum, maximum and STDEV
And average response time

9. Device Activity Front-end activity (LPAR view):
Fields
SID
Sysplex
SystemName
Storage Array
Storage Group
LCU
Tag
Unit
Cylinders
Front-end activity (LPAR view):
I/O’s per second (IOPS)
Response times: connected, disconnected, pending, CMR
Queuing delays
PAV activity (not Hyper-PAV)

10. Device Activity counters
Counters available:

11. Response time components
Connect, disconnect and pending time components vs IOPS

12. Channel Activity (LPAR)
Fields
SID
Sysplex
SystemName
CHPID
CSSID
Channel Acron
Channel type
Measure the activity on the channels:
Number of read and writes
MB/s transferred

13. Channel activity
Channel activity: MB/s read and MB/s writes

14. CEC Channel Activity FICON and Hiper-FICON (zHPF)
Fields
CEC name
CHPID
CSSID
Channel Acron
Channel type
FICON and Hiper-FICON (zHPF)
Total activity per CHPID

15. LCU Configuration Configuration history matrix:
Fields
CEC name
Sysplex
SID
System name
LCU
CHPID
CSSID
CU number
Channel acron
Channel type
Storage Array
Tag
SSID
Configuration history matrix:
Built from RMF records

16. Volume Configuration Volume configuration matrix: Fields Volser SID
Sysplex
System name
Storage Array
Storage Group
Device number
LCU
Tag
Unit
Device type
Unit type
Cylinders
Volume configuration matrix:

17. Config Explorer
Crossing information on RMF records, we build explorers for each view:

18. Volume Allocation History
based on DCOLLECT “V” records
Fields
Volser
Storage Group
Storage Array
Tag
Unit
Device type
Manufacture
Cylinders

19. DASD Discovery
Interrogates the z/OS and build a DASD configuration

20. DASD Discovery Device information:
VOLSER
Channel paths
CDR information
Space information
DCOLLECT information
“Build the DASD infra-structure from this information.”

21. Volume Identity Volume identity :
Identified by the Configuration Data Record (CDR)
DEVNUM
TAG
VOLSER
IBM DT
Type number
002107
Model number
932
Manufacture
IBM
Plant 82
Serial number
DT971
Tag
0100

22. Discovery communication
The DataLoader utility request the configuration

23. Discovery Views
Logical view
Historical
MVS perspective: device number, LPAR, work...
Physical view
DASD device: capacity, space counters.
Current view
Current
Current LPAR’s views
“A DASD device (physical DASD) can be connected to many LPAR’s (MVS device)”

24. Info date and Last update
Historical views are builted based on the Info date and Last update fields:
Info date
Date and time of the information.
Last update
Last date and time the information was checked and remained unchanged.

25. Reference date Current view: Represent the current DASD configuration;
Just the must up-to-date information is kept;
The reference date limit the view.

26. Logical view LPAR view: MVS perspective; Device history; Online
Storage
Resident
Shared
System
PAV
Private
PAV base
Public
PAV alias
Demountable
Cataloged
Page
SMS
VOLSER
Device type
LPAR name
Type num
Device number
Model num
SMS storage group
Manufacture
Unit type
Plant
Cylinders
Serial number

27. Physical view Storage view: Represent a DASD device;
The device information is shared by all LPAR’s;
Installation capacity history;
Duplicated volumes (same volser);
VOLSER
Manufacture
Cylinders
Plant
Type num
Serial number
Model num
Tag

28. Explorers