HP X3800sb Serial Attached SCSI technology, 3rd edition
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- HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 1
terminology...2 SAS technology ...3 SAS devices ...3 SAS drive performance ...4 Differential signaling ...4 SAS protocol evolution ...6 SAS 13 Zoning methodology ...14 Zone management ...14 Zoning advantages in an HP environment 15 Zoning example...16 Cabling and connectors technology ...17 Mini - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 2
another through a service delivery subsystem. SAS drives that provide maximum reliability, highest performance, scalability, and with SATA drives. A protocol used to communicate with SAS expanders. A protocol used to communicate with SAS drives. Service delivery subsystem Target The part of a - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 3
from SCSI storage devices by using serial communication (one bit at a time). The SAS architecture solves the parallel SCSI problems of bus forming a SAS domain. Target devices can be SAS disk drives, SATA disk drives, or SAS tape drives. Expanders, low-cost, high-speed switches, let you increase - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 4
. HP uses SAS technology to build highly scalable and reliable storage solutions. In enterprise server environments, SFF SAS drives excel in performance and reliability. SFF drives require only 70% of the space and 50% of the power of 3.5inch large form factor (LFF) SAS drives. SFF drives support - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 5
Differential signaling reduces the effects of capacitance, inductance, and noise experienced by parallel SCSI at higher speeds. In differential signaling, the positive signal minus the negative signal equals 1500-900 = 600mV or 900-1500 = - 600mV (Figure 2). SAS communication operates in full duplex - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 6
expanders by replacing them with self-configuring expanders. SAS-2 includes zoning capabilities fastest commonly supported speed. SAS-2.1 The SAS-2.1 standard defines active cables, storage power management circuitry. Active circuitry includes built-in drivers and repeaters, along with an equalizing - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 7
SAS 1.1 and trained SAS-2 with active copper and optical cables Storage power management SAS-2.1 devices can turn off SAS physical links when physical links saves a little less than 1 W for a dual-ported drive with two transceivers and a controller (or attached SAS expander) with two transceivers - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 8
interface lets you use SAS drives, SATA drives, or both SAS and SATA drives in the same storage enclosure. The SAS architecture storage solutions, you can choose storage devices based on reliability, performance, and cost. Figure 4. Examples of solutions available with SAS architecture SAS supports - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 9
. Each drive has a point-to-point connection to the controller. The controller can support a maximum of eight drives. In this configuration, the controller disables the external port if more than four drives are connected. Figure 5. Two internal ports on the controller provide redundancy for storage - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 10
for RAID systems using an internal port of the SAS controller, an HP SAS Expander Card, and SAS or SATA drives. The full height HP Smart SAS Expander card supports more than eight internal drives on select ProLiant servers when connected to a Smart Array P410 or P410i controller. The SAS expander - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 11
port incorporates four lanes for a total maximum throughput of 2400 MB/s. The storage enclosure contains an internal 36-port expander that supports cascading an additional enclosure in a 1+1 configuration. Figure 7. External port topology to support the cascading of an additional enclosure 11 - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 12
A multi-node cluster using SAS provides an alternative to clustered Fibre Channel local loop topologies. This SAS architecture can give you high performance and high availability with no single point of failure. Figure 8 shows a multi-node cluster using a SAS RAID controller. Vendors can implement - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 13
be complex. Zoning can work well in small topologies like server blade enclosures and clustering environments using a common storage blade. This grouping allows access to one expander device without zoning enabled. Figure 9. A ZPSDS configured to allow only certain end devices to see each other 13 - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 14
to a zone group, and any device attached to one of the ports becomes part of that respective zone group. By default, all devices within a zone group can devices in different zone groups. If an attached device changes, you may configure the expander to set the zone group to 0 (no access), which - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 15
Zoning advantages in an HP environment In an HP ProLiant environment, the HP Virtual SAS Manager (VSM) configures and manages device zoning. The VSM simplifies the process of performing zoning operations and managing the connected blade systems and storage devices. The VSM assigns zone groups to all - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 16
Zoning example When you deploy an HP BladeSystem c-Class enclosure, you need each server in the enclosure to have its own dedicated disks. The servers in the enclosure need more capacity than an HP StorageWorks SB40c Storage Blade can provide. Zoning can solve this problem. Figure 11 shows how you - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 17
Cabling and connectors technology Mini SAS 4x cable connectors and receptacles Mini SAS 4x connectors and receptacles (Figure 12) are replacing SAS 4x connectors and receptacles in new designs. Mini SAS connectors are a small form factor providing better airflow and contain ground pins available for - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 18
ports for direct-attached devices. The SAS-2 receptacles do not have table routing or subtractive routing restrictions, making them universal. Figure 15. Cable connector key slot positions 18 - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 19
input/output (SGPIO) busses. The Mini SAS 8x HD (external) connectors support both passive and active cables. Conclusion SAS makes it possible to create highly evolve and improve. Using the latest SAS technologies, HP builds highly scalable and reliable solutions for enterprise environments. 19 - HP X3800sb | Serial Attached SCSI technology, 3rd edition - Page 20
Resource description HP data storage HP ProLiant storage papers and audio podcasts HP Virtual SAS Manager User Guide Performance factors for HP ProLiant Serial Attached Storage (SAS) technology brief Redundancy in enterprise storage networks using dual-domain SAS configurations technology brie
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Serial Attached SCSI technology
Technology brief, 3
rd
edition
Introduction
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2
SAS terminology
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2
SAS technology
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3
SAS devices
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3
SAS drive performance
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4
Differential signaling
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4
SAS protocol evolution
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6
SAS-1
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6
SAS-2
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6
SAS-2.1
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6
SAS/SATA interoperability
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8
SAS topologies
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8
Zoning
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13
Zoning methodology
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14
Zone management
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14
Zoning advantages in an HP environment
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15
Zoning example
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16
Cabling and connectors technology
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17
Mini SAS 4x cable connectors and receptacles
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17
Mini SAS 8x cable connectors
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19
Conclusion
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For more information
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Call to action
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