Rich set of business continuance solutions The ESS Model 750 supports a rich set of copy service functions and IBM TotalStorage Resiliency Family The IBM Total Storage Resiliency Family is comprised of IBM The following ESS Model 750 functions are key components of The direction of the "refresh" can also be reversed, in which case the FlashCopy to a PPRC primary lets you establish a PPRC is a hardware-based disaster recovery solution Peer to Peer Remote Copy (PPRC) PPRC Version 2 further supports business continuance solutions with PPRC Version 2 further supports business continuance Asynchronous Cascading PPRC provides a long-distance remote copy In a three-site configuration, the synchronous PPRC relationship is In a two-site configuration, the synchronous PPRC relationship is PPRC Global Mirror is designed to provides a long-distance PPRC Metro/Global Copy is designed to provide a Concurrent Copy offers another method for creating a Calculating physical and effective capacity Refer to the IBM TotalStorage Enterprise Storage Server ESS Advanced functions Advanced functions are enabled and authorized based upon Refer to the IBM TotalStorage Enterprise Storage Server Standby CoD Disk Eight-Packs can be excluded from the Refer to "Ordering ESS Advanced Functions" at the end PPRC PPRC must be purchased for both the primary and secondary PPRC requires the installation of at least one Fibre PPRC is supported with the use of SAN fabric products, Vendors should be consulted regarding hardware and software When using channel extender products with PPRC, the PPRC over Fibre Channel: PPRC over Fibre Channel Asynchronous PPRC (PPRC Global Mirror): PPRC Mirror will be used during failback from the secondary ESS In the event of a planned or unplanned outage, recovery PPRC Global Mirror is not supported in Asynchronous Asynchronous Cascading PPRC (PPRC Metro/Global
management tools that can be used to build solutions to help meet
business continuance requirements.
TotalStorage Resiliency Core Technology, an extensive set
of hardware and software features and products, and IBM
TotalStorage Resiliency Automation, integrated software
and services packages. The IBM TotalStorage Resiliency
Family is designed to help you implement storage
infrastructures to help keep your business running 24
hours a day, 7 days a week.
the IBM TotalStorage Resiliency Core Technology:
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with support for the following additional functions:
with the following additional functions:
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volume involved in a FlashCopy relationship. With Incremental FlashCopy,
the initial relationship between a source and target is maintained. When
a subsequent FlashCopy establish is initiated, only the data required to
bring the target current to the source's newly established point-in-time
is copied. Incremental FlashCopy can help reduce the background copy
completion time when only a subset of data on either the source or target
has changed, giving you the option to perform a FlashCopy on a more
frequent basis.
LUN or volume previously defined as the target becomes the source for the
LUN or volume previously defined as the source (and is now the target).
Again, only the data required to bring the target current to the source's
point-in-time is copied. If no updates were made to the target since the
last "refresh", the direction change could be used to "restore" the
volume involved in a FlashCopy relationship. When a subsequent FlashCopy
establish is initiated, only the data required to bring the target
current to the source's newly established point-in-time is copied. The
direction of the "refresh" can also be reversed, in which
case the LUN or volume previously defined as the target
becomes the source for the LUN or volume previously defined
as the source (and is now the target). Incremental
FlashCopy can help reduce the background copy completion
time when only a subset of data on either the source or
target has changed, giving you the option to perform a
FlashCopy on a more frequent basis. Additionally, if no
updates were made to the target since the last "refresh",
the direction change could be used to "restore" the
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FlashCopy relationship where the FlashCopy target is also
a PPRC primary volume. This enables you to create full
or incremental point-in-time copies at a local site and
then use PPRC to copy the data to the remote site.
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designed to provide real-time mirroring of logical volumes within an ESS
or between two ESSs that can be located up to 103 km from each other.
PPRC is a synchronous copy solution where write operations are completed
on both copies (primary and secondary ESS) before they are considered to
be done. PPRC also includes PPRC Extended Distance (PPRC-XD), a
non-synchronous long-distance copy option for data migration and backup.
is designed to offer hardware-based remote copy solutions.
Synchronous PPRC (PPRC Metro Mirro) is designed to provide
real-time mirroring of logical volumes between two ESSs
that can be located up to 103 km from each other when
using ESCON communication links and up to 300 km when
using Fibre Channel communication links. It is a
synchronous copy solution where write operations are
completed on both copies (local and remote site) before
they are considered to be done. PPRC also includes PPRC
Extended Distance (PPRC Global Copy), a non-synchronous
long-distance copy option for data migration and backup.
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support for the following additional functions:
solutions with following additional functions:
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solution for zSeries and open systems environments by allowing a PPRC
secondary volume (involved in a PPRC synchronous relationship) to also
simultaneously serve as a PPRC primary volume in a PPRC-XD relationship
to the remote site. This capability enables the creation of three-site
or two-site Asynchronous Cascading PPRC configurations.
maintained between an ESS at the local site and an ESS at an intermediate
site (located within 103 km of the local site). A PPRC-XD relationship
is simultaneously maintained between the ESS at the intermediate site and
an ESS at the remote site. The remote site can be located at distances
well beyond 103 km from the intermediate site -- with the distance
typically limited only by the capabilities of the network and channel
extension technologies. When used with specific operational procedures,
a three-site configuration can be designed to provide a data protection
solution in the event of an unplanned outage at any one of the three
sites. Alternatively, operational procedures, including the creation of
a "safety copy" at the remote site using FlashCopy, can be used to design
a solution that provides a consistent copy of the data at the remote site
in the event of a regional outage affecting both the local and
intermediate site.
maintained between two ESSs, both of which are located at the local site,
or within a single ESS. A PPRC-XD relationship is simultaneously
maintained to an ESS at the remote site, which can be located at long
distances from the local site. With operational procedures, including
the creation of a "safety copy" at the remote site using FlashCopy,
solutions can be designed providing a consistent copy of the data at the
remote site in the event of an outage at the local site.
remote copy solution across two sites using asynchronous
technology. It operates over high-speed, Fibre Channel
communication links and is designed to provide the following:
local and remote sites, with the distance typically limited
only by the capabilities of the network and channel
extension technologies. This can better enable you to
choose your remote site location based on business needs
and enables site separation to add protection from
localized disasters.
remote site, created with minimal impact to applications
at the local site. Compared to Asynchronous Cascading
PPRC (PPRC Metro/Global Copy), PPRC Global Mirror eliminates
the requirement to do a manual and periodic suspend at the
local site order to create a consistent and restartable copy
at the remote site.
site lags behind the local site an average of 3 to 5 seconds,
minimizing the amount of data exposure in the event of an
unplanned outage. Data currency is also known as the
recovery point objective (RPO). The actual lag in data
currency experienced will depend upon a number of factors,
including specific workload characteristics and bandwidth
between the local and remote sites.
requirements and optimization of available bandwidth.
site is internally managed across up to eight ESS machines
located among the local and remote sites.
with support for PPRC failover and failback modes, helping
to reduce the time required to switch back to the local
long-distance remote copy solution across three sites
using a combination of PPRC Metro Mirror and PPRC Global
Copy. In a three-site configuration, the PPRC Metro Mirro
is maintained between an ESS at the local site and an ESS
at an intermediate site, while a PPRC Global Copy
relationship is simultaneously maintained between the ESS
at the intermediate site and an ESS at the remote site.
When used with specific operational procedures, this can
be designed to provide a data protection solution in the
event of an unplanned outage at any one of the three sites.
Alternatively, operational procedures, including the creation
of a "safety copy" at the remote site using FlashCopy, can
be used to design a solution that provides a consistent
copy of the data at the remote site in the event of a
regional outage affecting both the local and intermediate
site.
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point-in-copy in zSeries and S/390 environments, with the source data
fully available for access and update after initiation of the copy
operation.
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Introduction and Planning Guide (GC26-7444) for capacity
calculation guidelines.
the physical capacity of the ESS:
than the total physical capacity of the ESS.
than the total physical capacity of the ESS.
than the physical capacity within the ESS that will be
logically configured as Count Key Data (CKD) volumes for
use with zSeries and S/390 servers.
Introduction and Planning Guide (GC26-7444) for physical
capacity calculation guidelines.
Refer to the IBM TotalStorage Enterprise Storage Server
Introduction and Planning Guide (GC26-7444) for physical
capacity calculation guidelines.
physical capacity calculation when the Standby CoD
Indicator (feature number 9510) is present on the machine.
of the Special Features section for ordering instructions.
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ESS. In three-machine Asynchronous Cascading PPRC (PPRC
Metro/Global Copy) configurations, PPRC must also be
purchased for the intermediate ESS.
Channel/FICON or ESCON host adapter on each ESS in the
PPRC configuration to serve as the PPRC communications
link. For higher availability, IBM recommends that more
than one host adapter per ESS be used for the PPRC
connectivity.
ESCON directors, Dense Wavelength Division Multiplexing
(DWDM) products, and channel extenders. A current list
of supported environments, configurations, networks, and
products is available at:
prerequisites when using their products in an ESS PPRC
configuration. IBM is not responsible for third-party products.
channel extender vendor will determine the maximum
distance supported between the primary and secondary ESS.
The vendors should be contacted for their distance
capability, line quality requirements, and WAN attachment
capabilities.
communication links has the following additional prerequisites:
Global Mirror has the following additional prerequisites:
machine(s), FlashCopy Version 2 must also be enabled on the
primary machine(s).
procedures are required to achieve a consistent and
restartable copy of the data at the remote site. Scripts
and software can be used to help automate these procedures.
Cascading PPRC (PPRC Metro/Global Copy) configurations
as an alternative to the PPRC-XD (PPRC Global Copy)
relationship to the remote site.
Copy): PPRC Metro/Global Copy has the following
additional prerequisites: