IBM System Storage DS Architecture and Implementation. Storage facility Configuring the DS storage for FB volumes. Front cover. IBM System Storage. DS Architecture and Implementation. Bertrand Dufrasne. Andreas Baer. Peter Klee. Danijel Paulin. This IBM® Redbooks® publication describes the concepts, architecture, and implementation of the IBM System Storage™ DS series of disk storage.

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DS8000 architecture

It operates as a hidden partition, with no processor resources assigned to it. Figure shows the fabric design of the DS Consult your local IBM representative for information on the products and services currently available in your area.

implementatiion If either PPS fails, the other can continue to supply all required voltage to all power needed throughout that frame. When a host performs a read operation, the processor complexes, also called Central Electronics Complexes CECsfetch the data from the disk arrays using the high-performance switched Fibre Channel architecture.

IBM System Storage DS8000 Architecture and Implementation Front cover

A business class system architectyre now be configured with implemsntation minimum of 16 GB of cache. The DS uses floating parity technology such that no one drive is always involved in every write operation. For copy services support, a business class system with feature code 16 GB memory requires a memory upgrade to either 32 GB or 64 GB to increase the number systsm DDMs beyond Figure DS configuration: The 2-way systems cannot have expansion frames it includes business class cabled DS systems.

It avoids using RAID recovery to reconstruct all of the data onto the spare drive. Hardware components and architecture 49 3. Unless the extended power line disturbance feature ePLD has been purchased, the BBUs do not keep the storage disks in operation.

Planning and administration tools.

This feature allows you to establish a FlashCopy relationship where the target is a remote mirror Metro Mirror primary volume keeping the pair in the implementwtion duplex state. Architecture and Implementation With the introduction of small form factor SFF disk enclosures on DS, certain changes have been made to the PPS to support the disk enclosure power requirements.


It is referred to as Call Home for service. Storaage expansion frames impkementation not contain rack power control cards: These two servers share the load of receiving and moving data between the attached hosts and the disk arrays. DS Model Business Class cabling: Each logical volume belongs to a logical subsystem LSS. This feature provides extremely fast access to data, energy efficiency, and higher system availability. The furnishing of this document does not give you any license to these patents.

Data is striped on a block level across a set of drives, similar to RAID 5 configurations, and a second set of parity is calculated and written across all the drives, as shown in Figure The models have the following capacities: These 8-Gbps adapters are restricted to slots 1 and 4 only. One of the risks here is that longer rebuild times increase the possibility that a second DDM error will occur within the rebuild window. Metro Mirror Consistency Groups, when used with a supporting application, can be used to maintain data and transaction consistency across multiple LUNs or volumes, or even multiple DS systems.

Each enclosure contains two port Fibre Channel switches. The array consists of six data drives and one parity drive.

DS architecture

The decision of when and what to prefetch is made in accordance with the Adaptive Multi-stream Prefetching AMPa cache management algorithm. The expansion frame 94E can only be attached to the 4-way processor complex.

More detailed information about functions and features is provided in subsequent chapters. The DS and DS have different disk enclosure form factors, and are individually described in this section. These groups are installed evenly across the disk enclosure pair. Hardware components and architecture 59 Figure illustrates the preferred HA plug order for DS Storage Tier Advisor Tool.

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Model standard cabling supports nondisruptive upgrades from dual 2-way to dual 4-way. With all these components, the DS is positioned stoorage the top of the high performance category. After the Incremental Resync, you can change the copy target destination of a copy relation without requiring a full copy of the data.

The following functions are included: Iplementation information contains examples of data and reports used in daily business implemetnation. The complete failure of either director leaves half the paths still operating. Some measurements may have been made on development-level systems and there is no guarantee that these measurements be the same on generally available systems. The first expansion frame can have a maximum of 3.

For open systems, strage are called LUNs.

A fully configured 4-frame DS system can contain a maximum of disks. Each storage enclosure contains two port bridges. There are redundant fans in each power supply unit and redundant power supply units in each disk enclosure.

Performance of the RAID 5 array returns to normal when the data reconstruction onto the spare device completes.

Each disk plugs into the disk enclosure backplane. It helps to alleviate address constraints to support large storage capacity needs. Thus the contents of NVS memory modified data not yet destaged to disk from cache have enough time to be written to a number of disk drives internal to the processor complexes not the storage DDMs.

Architecture and Implementation 1 Chapter 1. Any reference to an IBM product, program, or service is not intended to state arxhitecture imply that only that IBM product, program, or service may be used.