HP 60 Redundancy in enterprise storage networks using dual domain SAS configur
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- HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 1
using dual-domain SAS configurations technology brief Abstract...2 Introduction...2 Why dual-domain SAS is important ...2 Single SAS domain ...3 Dual-domain SAS...4 Examples of redundant architectures using serial storage 5 Dual-domain SAS...5 Dual-domain SAS: servers in two-node cluster 6 HP dual - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 2
hard drives. The higher failure rates are the result of the mechanical connection points and moving parts inherent in these components. Dual-domain SAS creates an additional domain to address this single domain pathway failure. The additional domain uses an open port on an HP Smart Array controller - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 3
RAID configured. Figure 1. Single domain SAS storage network Server Controller 4 IO Module Expander NOTE: All figures in this technical brief using the "4 " notation indicate a 4-lane bundled path. There are 4 wires per lane, or 16 total wires in a 4x cable. Disk drive Disk drive Disk drive JBOD - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 4
cable failure, and expander failure. Figure 2. SAS dual-domain SAS to JBOD storage network Server 4 Controller 4 IO Module Expander IO Module Expander SAS drive SAS drive SAS drive JBOD NOTE: Currently, the P800 controller provides dual-domain support For additional information on Serial - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 5
made possible by serial storage, Smart Array, and cluster computing technologies. Dual-domain SAS This dual-domain SAS architecture provides redundant pathways for cascaded JBODs. Using two IO modules for each enclosure and SAS dual-port drives, this configuration provides redundancy throughout - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 6
(HBA) or cable failure, as shown in Figure 4. Dual-domain SAS requires "active/active" configurations. The "active/active" configurations permit both controllers to process I/Os, and either controller can act as a standby. To use the dual-ports for redundant pathways, all drives must be SAS. Figure - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 7
dual-path with cascaded JBODs The dual-path approach can prevent a single point of failure occurring in complex enterprise configurations such as cascaded JBODS. The configuration is supported for both SAS and SATA drives. In this configuration a controller is connected to the IO module at each end - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 8
SAS hard drives during the last half of 2007. HP is now introducing products that support SAS dual port operation. As of this writing, the Smart Array P800 controller is capable of supporting two domains. The HP StorageWorks Dual Domain I/O Module Option Kit enables the 60 Modular Smart Array and 70 - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 9
, or ports. The drives are referred to as "dual-port" because each Phy reports a unique SAS address. JBOD The acronym stands for "Just a Bunch of Disks", JBOD typically refers to a group of hard disks, usually in an enclosure, that are not RAID configured. Multiple SCSI domains If two ports cannot - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 10
SAS phy phy layer physical layer SAS phy physical layer phy layer link layer SAS domain A SAS domain consists of one or more SAS devices and expander devices and can be contained within a SCSI domain SCSI domain A SCSI domain contains a service servers and task managers and the service - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 11
of dual-domain SAS technology and reduces the number of possible single points of failure within a system. SAS and SATA technology Parallel storage technology has reached hard limitations with respect to volume and speed. The physical architectural differences found in SCSI and ATA drives also - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 12
cannot accommodate the dualported pathways used by SAS drives. These blind-pluggable connectors enable a common topology including controllers, HBAs, backplanes and both SAS and SATA drives. Such commonality permits the implementation of dual-domain SAS technology by providing a single standard for - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 13
Controllers, HBAs and hard drives (SAS drives) all require dual-ports to have a dual-domain configuration. SATA drives can act as dual-port devices with the intervention of appropriate port selectors or switches. Expander An expander is a device used to facilitate communication among large numbers - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 14
members and HP Smart Array controllers directing data traffic on existing domains The cluster interconnect is normally used for five high-level functions: • Cluster Executive components • Cluster I/O • Cluster Networking • Reliable Datagrams • Application-specific traffic. Firmware and Software - HP 60 | Redundancy in enterprise storage networks using dual domain SAS configur - Page 15
overview_public.pdf HP StorageWorks 60 Modular Smart Array Overview & Features HP StorageWorks 70 Modular Smart Array Overview & Features Modular Smart Array dual domain Q&A HP Smart Array P800 controller Overview & Features HP SAS Drives Questions & Answers http://h18002.www1.hp.com/storage
Redundancy in enterprise storage networks
using dual-domain SAS configurations
technology brief
Abstract
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2
Introduction
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2
Why dual-domain SAS is important
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2
Single SAS domain
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3
Dual-domain SAS
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4
Examples of redundant architectures using serial storage
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5
Dual-domain SAS
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5
Dual-domain SAS: servers in two-node cluster
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6
HP dual-path with cascaded JBODs
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7
Summary
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8
Appendix A: Nomenclature and definitions
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Dual-path
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Dual-port
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JBOD
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Multiple SCSI domains
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Port Identifier
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phy
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SAS domain
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SCSI domain
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SCSI initiator
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SCSI initiator port
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SCSI target port
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Appendix B: Enabling technology
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SAS and SATA technology
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Connectors
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Backplane
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Devices
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Drives and controllers
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Expander
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Cluster Interconnect
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13
Firmware and Software
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14
Serial Tunneling Protocol (STP)
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14
SPC-3 Target port group commands
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14
For more information
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15
Call to action
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