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3-22 Functional and Operational Characteristics
Hitachi Universal Storage Platform V/VM User and Reference Guide
Mode Category Function Default MCU/RCU
573
TrueCopy for z/OS,
ShadowImage for
z/OS
For the CU emulation type 2105/2107, specifying the
CASCADE option for the ICKDSF ESTPAIR command is
allowed.
Mode 573 = ON: The ESTPAIR CASCADE option is allowed.
Mode 573 = OFF (default): The ESTPAIR CASCADE option is
not allowed. (When specified, the option is rejected.)
Note:
1. When CU emulation type is 2105/2107, this mode is
applied in the case where pair creation in TCz – SIz
cascading configuration in the ICKDSF environment fails
with the following message output.
Message: ICK30111I DEVICE SPECIFIED IS THE
SECONDARY OF A DUPLEX OR PPRC PAIR
2. The CASCADE option can be specified in the TSO
environment also.
3. Although the CASCADE option can be specified for the
ESTPAIR command, the PPRC-XD function is not supported.
4. Perform thorough pre-check for any influence on
GDPS/PPRC.
5. The SOM must be enabled only when the CASCADE option
is specified for the ESTPAIR command for the CU emulation
type 2105/2107.
OFF MCU/RCU
The unit
where TCz
and SIz in
a
cascading
config.
use the
same
volume.
585
Copy-on-Write
Snapshot
At the time of page allocation during the host write operation
of COW Snapshot, HDD blocks are sequentially allocated from
the top, aiming for performance improvement in destaging to
the pool by achieving efficient HDD access.
Mode 585 = ON: Page allocation is performed in random
order.
Mode 585 = OFF (default): Page allocation is performed in
sequential order.
Note:
1. Set this mode to ON when you want to deactivate the new
HDD block allocation method that is supported in USP V/VM
microcode 60-05-xx-00/00.
2. The action of this mode has been reversed in the USP
V/VM, so that the desired functionality is achieved with the
mode set to OFF (default). For TagmaStore USP/NSC the
desired functionality is achieved with the mode set to ON.
Caution: Turning this mode to ON for USP V/VM will
deactivate this functionality.
3. As the HDD blocks are allocated in random order, a pool
can become bottleneck, and performance may be affected.
4. Even though this mode is ON, pools created when this
mode was OFF continue to operate on the new logic
(function enabling HDD blocks to be allocated from the
top), so all pools created while this mode was OFF need to
be deleted.
OFF –
- User and Reference Guide 1
- Contents 3
- Acronyms and Abbreviations 5
- Preface 7
- CLASS 1 LASER PRODUCT 8
- LASER KLASSE 1 8
- Intended Audience 9
- Product Version 9
- Document Revision Level 9
- Changes in this Revision 10
- Document Organization 10
- Referenced Documents 11
- Document Conventions 11
- Getting Help 12
- Comments 13
- Product Overview 15
- 1-2 Product Overview 16
- • Specifications 17
- Specifications at a Glance 18
- Product Overview 1-5 19
- 1-6 Product Overview 20
- Product Overview 1-7 21
- Software Products 22
- Product Overview 1-9 23
- 1-10 Product Overview 24
- Product Overview 1-11 25
- 1-12 Product Overview 26
- Architecture and Components 27
- Hardware Architecture 28
- DKA DKA 29
- Storage Clusters 30
- Hardware Components 31
- Shared Memory 32
- Cache Memory 32
- Disk Drives and Flash Drives 37
- Service Processor 38
- Power Supplies 38
- Batteries 38
- Control Panel 39
- Emergency Power-Off Switch 41
- RAID-Level Intermix 42
- Data Drive Intermix 43
- Device Emulation Intermix 43
- Functional and Operational 45
- Characteristics 45
- RAID Implementation 46
- Sequential Data Striping 48
- Array group 1 (7D+1P) 49
- Array group 2 (7D+1P) 49
- LDEV Striping 49
- CU Images, LVIs, and LUs 51
- Logical Units 52
- Storage Navigator 53
- System Option Modes 54
- Mode 506 = ON (default): 63
- Mode 506 = OFF: 63
- File system is used 74
- Mainframe Operations 79
- Mainframe Configuration 80
- Open-Systems Operations 81
- Open-Systems Configuration 83
- Battery Backup Operations 84
- Destage Mode 85
- Backup Mode 85
- Troubleshooting 87
- General Troubleshooting 88
- Service Information Messages 89
- 4-4 Troubleshooting 90
- MK-96RD635-12 102
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