HP 418800-B21 Redundancy in enterprise storage networks using dual domain SAS
HP 418800-B21 - StorageWorks Modular Smart Array 70 Storage Enclosure Manual
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HP 418800-B21 manual content summary:
- HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 1
10 Appendix B: Enabling technology...11 SAS and SATA technology ...11 Connectors ...12 Backplane ...13 Devices...13 Drives and controllers ...13 Expander ...13 Cluster Interconnect ...13 Firmware and Software ...14 Serial Tunneling Protocol (STP) ...14 SPC-3 Target port group commands 14 For more - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 2
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 that is capable of supporting dual-domain SAS. The second port on - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 3
." It refers to a group of hard disks, usually in an enclosure, that may or may not be 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 - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 4
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 technology - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 5
some of the redundant storage scenarios 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 - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 6
and either controller can act as a standby. To use the dual-ports for redundant pathways, all drives must be SAS. Figure 4. Multi-Path, 2-Node, HA cluster configuration Server HBA Cluster interconnect Server HBA 4 4 4 4 IO Module Expander IO Module Expander SAS drive SAS drive SAS drive JBOD - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 7
HP 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 - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 8
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 Modular Smart Array to support redundant pathways from servers to storage - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 9
related to storage network redundancy and dual-domain SAS configurations. Dual-path Dual, redundant paths between initiator and target ports 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 - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 10
refers to an initiator port or a SCSI target/initiator port operating as a SCSI initiator port. SCSI target port A SCSI target port contains a task router. It acts as the connection between device servers and task managers and the service delivery subsystem through which requests and responses are - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 11
SAS technology and reduces the number of possible single points of failure within a system. SAS and SATA technology Parallel storage of wiring and connectors, serial technology reduces the incidence of crosstalk, signal skew, and other forms of signal error found in parallel storage networks. Serial - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 12
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 all storage network pathways. Figure B-2. SAS and SATA connectors SATA connector SATA connector SAS connector Key - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 13
is a device used to facilitate communication among large numbers of SAS devices. Expanders contain two or more external expander ports. Each expander device contains at least one SAS Management Protocol target port for management and may contain SAS devices. For example, an expander may include - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 14
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 A storage - HP 418800-B21 | Redundancy in enterprise storage networks using dual domain SAS - Page 15
.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/disk_storage
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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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Summary
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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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Serial Tunneling Protocol (STP)
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SPC-3 Target port group commands
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For more information
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Call to action
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