Summary of changes
This document contains terminology, maintenance, and editorial changes for
version GC27-2297-09 of the IBM System Storage DS8800 and DS8700 Introduction
and Planning Guide. Technical changes or additions to the text and illustrations are
indicated by a vertical line to the left of the change.
New information
The following section contains new information for Version 6, Release 3,
Modification 1:
T10 DIF support
American National Standards Institute (ANSI) T10 Data Integrity Field
(DIF) standard is supported on System z for SCSI end-to-end data
protection on fixed block (FB) LUN volumes. This support applies to the
IBM Storage DS8800 unit (models 951 and 95E). System z support applies
to FCP channels only. For more information, see “T10 DIF support” on
page 36.
Global Mirror pause on a consistency group boundary
A new Global Mirror command pauses Global Mirror after a consistency
group has formed. By internally suspending data transfers between Global
Copy primary and Global Copy secondary devices, the DS8000 enables
software such as GDPS
®
to perform simpler and faster test copy scenarios.
For more information, see your IBM representative.
PPRC dynamic bitmaps for the DS8700 and DS8800
For large volumes or SATA drives, Hyperswap operation times are too
long. This happens because of the amount of metadata that is read during
the Hyperswap operation to initialize the PPRC bitmap. Support is now
available to pre-initialize the PPRC bitmap so that the time required for a
PPRC failover (Hyperswap) operation is not dependent on the size nor
speed of the drives. For more information, see your IBM representative.
Changed information
The following section contains changed information for Version 6, Release 3,
Modification 1:
Maximum number of FlashCopy relationships on a volume
The maximum number of FlashCopy relationships allowed on a volume is
65534. For more information, see “Copy Services” on page 55.
© Copyright IBM Corp. 2004, 2012 xix
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