IBM SYSTEM STORAGE DS8000 ARCHITECTURE AND IMPLEMENTATION PDF
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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This scrubbing process applies to both array members and spare DDMs. A dummy carrier looks similar to a DDM in appearance, but contains no electronics.
Each logical volume belongs to a logical subsystem LSS. In a maximum configuration, the base frame can hold disk drives.
The first expansion frame can contain up to 14 storage enclosures installed in pairs. Where there is a significant difference, we describe the two systems separately. Slots 1, 2, 4, and 5 support 4-Gbps 4-Port HAs. This model is available as either a dual 2-way processor complex with enclosures for DDMs and 16 FC host adapter cards, or a dual 4-way processor complex with enclosures for DDMs and 16 FC host adapter cards.
The location of write data with both CECs operational is shown in Figure From a reliability viewpoint, RAID 6 is particularly well-suited to large capacity disk drives.
IBM System Storage DS8000: Architecture and Implementation
Architecture and Implementation 1 Chapter 1. The expansion frame model is called 95E.
Dynamic Path Reconnect DPR allows the DS to select any available path to a host to reconnect and resume a disconnected operation, for example, to transfer data after disconnection due to a cache miss. Disk enclosure power supply DS The disk enclosure power supply unit provides 5V and 12V power for the DDMs, and houses the cooling fans for the disk enclosure.
Would you like to tell us about a lower price? This metadata remains associated with the application data as it is transferred throughout the DS The solution to this problem is the use of SAN switches or directors to switch logical connections from multiple hosts. This creates a switched Fibre Channel network to the installed disks. Contents vii 8.
For example, if a DS had six disk enclosures total, it would have three at the front and three at the rear. The green indicator shows ready status and disk activity when blinking, the amber indicator is used with light path diagnostics to allow for easy identification and replacement of a failed DDM. The business class option allows a system to be configured with more drives per device adapter, thereby reducing configuration cost and da8000 adapter utilization.
It is a complete storage unit contained in a single base frame. A business class cabling configuration can only be ordered as a base frame with no expansion frames. This feature aligns distinct service levels to separate workloads in the system to help maintain the efficient performance of each DS volume.
The first expansion frame can have a maximum of 2.
The and models can have the 2-way processor feature or the 4-way processor feature 2-way means that each processor complex has two CPUs, and 4-way means that each processor complex has four CPUs. The expansion frames do not contain rack power control RPC cards. Explore the Home Gift Guide. The target volume can be either a logical or physical copy of the data, with the ane copy copying the data as a background process.
It is particularly useful if you have rapid storsge unpredictable storage growth. Redundant spare memory bits in cache, directories, and main memory Redundant and hot-swap cooling Redundant and hot-swap power supplies Self-healing For a system to be self-healing, it must syorage able to recover from a failing component by first detecting and isolating the failed component.
To ensure that this write data is not lost due to a power event, the DS contains battery backup units BBUs. Introduction to the IBM System Storage DS series 15 Inband commands over remote mirror link In a remote mirror environment, inband FlashCopy allows commands to be issued from the local or intermediate site and transmitted over the remote mirror Fibre Channel links for execution on the remote DS It is possible to allow one or more of the following functions: If error correcting code ECC -correctable bad bits are identified, the bits are corrected immediately by the DS