Dell PowerVault 220S Manual
Optimizing dell scsi solutions
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A Reference Guide for Optimizing Dell™ SCSI Solutions
Authored By:
Dell SCSI Storage Solution Team
November 17, 2005 rev A02
____________________
Information in this document is subject to change without notice.
© Copyright 2005 Dell Inc. All rights reserved.
Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly
forbidden.
THIS WHITE PAPER IS FOR INFORMATIONAL PURPOSES ONLY, AND MAY CONTAIN
TYPOGRAPHICAL ERRORS AND TECHNICAL INACCURACIES. THE CONTENT IS
PROVIDED AS IS, WITHOUT EXPRESS OR IMPLIED WARRANTIES OF ANY KIND.
Dell, the Dell Logo, PowerVault, PowerEdge and OpenManage are trademarks of Dell Inc.
Microsoft is a registered trademark of Microsoft Corporation. Other trademarks and trade names
may be used in this document to refer to either the entities claiming the marks and names or their
products. Dell disclaims proprietary interest in the marks and names of others.
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Table of Contents
Related Manuals for Dell PowerVault 220S
Summary of Contents for Dell PowerVault 220S
- Page 1 Information in this document is subject to change without notice. © Copyright 2005 Dell Inc. All rights reserved. Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden. THIS WHITE PAPER IS FOR INFORMATIONAL PURPOSES ONLY, AND MAY CONTAIN TYPOGRAPHICAL ERRORS AND TECHNICAL INACCURACIES.
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Page 2: Table Of Contents
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 TABLE OF CONTENTS A REFERENCE GUIDE FOR OPTIMIZING DELL SCSI SOLUTIONS ............... 3 ..............................3 NTRODUCTION ....................4 TORAGE PPLICATIONS AND OMPONENTS Identify customer usage model and needs ......................4 Picking a solution based on the application profile.................... -
Page 3: A Reference Guide For Optimizing Dell Scsi Solutions
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 A Reference Guide for Optimizing Dell SCSI Solutions 1. Introduction Enterprise storage applications involve interconnection of multiple components – including both software and hardware aspects which would complete a storage solution. Any given storage application may be supported by one or more storage solutions. -
Page 4: Storage Applications And Components
In this document we present storage solution from Parallel SCSI perspective, specifically for Dell’s Direct Attached Storage (DAS) products. Other storage technologies such as SAS, SATA, or Fibre Channel, as well as topologies such as Network Attached Storage (NAS) or Storage Area Network (SAN) are outside the scope of this document. -
Page 5: General Raid Configuration Guidelines
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 the server/storage solution and will determine what RAID configuration will be the most optimal for the application. Table 2-2 outlines the recommended RAID solution based on the usage of the server. -
Page 6: Application Specific Guidelines
This should be used in situations where greater redundancy and data protection is required as well as reasonable storage capacity. Note: For more details on RAID configurations refer to the Dell™ ‘Getting Started with RAID’ document (http://support.dell.com/support/edocs/storage/RAID/RAIDbk0.pdf). Concatenated Container This solution is not recommended due to lack of data protection and redundancy and no performance gain. -
Page 7: Database Servers
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • RAID 10 – Recommended for enterprise mission critical e-mail servers where availability and redundancy and/or performance are the highest priority and reduce storage capacity is acceptable. • RAID 5 – Recommended for e-mail servers that require maximum storage capacity and only base data protection and performance. -
Page 8: Web Servers
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • RAID 5 – Recommended for databases that require maximum storage capacity and only base data protection and performance. • RAID 50 – Recommended for those solutions that require a balance between storage capacity and performance. -
Page 9: Online Transaction Processing Servers
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • RAID 5 – Recommended for web servers that require maximum storage capacity and only base data protection and performance. • RAID 50 – Recommended for those solutions that require a balance between storage capacity and performance. -
Page 10: File Servers
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • RAID 50 – Recommended for those solutions that require a balance between storage capacity and performance. Possible: • RAID 1 – Possible solution for situations which do not require high storage capacity. - Page 11 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • RAID 1 – Possible solution in situations which do not require high storage capacity. Not recommended: • RAID 0, Concatenated - These are not recommended due to lack of redundancy and data protection.
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Page 12: Streaming Media Servers
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 that can afford some downtime and rely on backups to restore data, this could be a solution. Streaming Media Servers Streaming media servers are systems that provide web casting, video conferencing, internet entertainment like TV or radio, and multimedia content oriented services. -
Page 13: Additional Configuration Factors
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 Additional configuration factors Hot Spares Hot Spare functionality provides extra security availability and redundancy by replacing a failed drive, allowing the rebuild of the degraded array to begin immediately. Both the Adaptec and LSI based PERC controllers’... -
Page 14: Dell's Product Offering
Dell offers a conversion kit to change from a PV220S to a PV221S. Basic features and options common to both models are shown in Figure 3-1. -
Page 15: Scsi Cabling
PowerEdge enterprise systems. The RAID controller offers a cost-effective way to implement RAID in a server. Dell is currently offering its fourth generation of RAID controllers, the PERC 4e family, supporting the industry standard Ultra320 SCSI storage interconnect. PERC 4e RAID controllers support the PCI-Express host interconnects for maximum bandwidth connectivity &... -
Page 16: Scsi Hard Drive Support
Enterprise solution that leverages industry standard hardware platforms and a common management framework for customers’ server and storage solutions. For a copy of our guarantees or limited warranties, please write Dell USA L.P., Attn: Warranties, One Dell Way, Round Rock, TX 78682. For more information, visit www.dell.com/warranty. - Page 17 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 In addition, many Dell servers & storage solutions offer cross generational support to ensure customers have a seamless experience when adopting new technologies. The following compatibility matrix indicates the cross-generational support Dell offers for its SCSI Solutions: •...
- Page 18 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • Table 3-4: PERC 2 & PERC 3 Support Matrix (4G & 5G servers) Y = Supported, N = Not Supported, # = maximum # of factory installed cards FI = Factory install; CK = Customer Kit...
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Page 19: Pv22Xs Enclosure Overview
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 4. PV22xS Enclosure Overview The PV22xS SCSI Enclosure provides three configuration topologies, also referred to as modes, which are end-user configurable: Joined, Split, and Cluster topologies, as shown in Figure 4-1. A 3-position switch located on the Split Bus Module (SBM) sets the desired enclosure topology. -
Page 20: Split Bus Topology
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 The primary EMM must always be present. Regardless of whether SES redundancy is available, the secondary EMM slot must always have either a EMM or Terminator module installed to properly terminate the SCSI bus. -
Page 21: Cluster Topology
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 Figure 4-3 Split Bus Cabling Options to a Single Host System, (a) Same Adapter, (b) Different Adapters Cluster Topology Cluster Topology is very similar to Joined bus topology. It provides the capability to have a single shared SCSI bus with the additional capability of allowing concurrent access from two host controllers (Figure 4-4). -
Page 22: Pv22Xs - Common Features And Capabilities
It is appropriate for business-critical systems since the application can use the full power of another server in case of a failure. Dell PowerEdge Clustered systems fully support both cluster topologies with MSCS. Figure 4-4 Cluster Topology Cabling Example PV22xS –... -
Page 23: Multiple Pv22Xs Enclosures On A Single Host System
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 be reserved for use by the second SCSI controller. A mapping of the SCSI ID address space reserved by the PV22xS enclosure is shown in Figure 4-5. The HDD identifiers are directly mapped to it’s assigned SCSI ID, as shown in Figure... -
Page 24: Mixing Hdd Capacities
By default, the audio alerts on the enclosure are disabled from the factory and must be enabled by the customer using Dell OpenManage, if desired. In summary, the following SES functions are provided by the PV22xS enclosure: •... -
Page 25: External Scsi Cables
Interface-3 (SPI-3) specification. For U320 speeds, ANSI SPI-4 must be adhered to. All PV22xS SCSI cables purchased from Dell have been tested and comply with the ANSI SPI-4 standard. When using existing customer cables or if the cables are purchased from party sources, ensure the cables are approved for ANSI SPI-4 operation. -
Page 26: Pv22Xs Configuration Topology And Application Attributes
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 Cable Connector Controller Connector P-type connector – Female P-type connector – Male VHDCI-type connector – Female VHDCI-type connector – Male • Figure 4-7 External SCSI Connector PV22xS Configuration Topology and Application Attributes PV22xS provides different configuration topologies, which may impact the storage solution for an application. - Page 27 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • Table 4-2: PV22xS Configuration Topologies Vs RAID Level Performance PV22xS Configuration Topologies RAID Levels Joined Split Cluster Best performance, if Default RAID 0 Similar to Joined RAID 0 configured across multiple...
- Page 28 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 PV22xS consists of four digital temperature probes, which in conjunction with SES processor provides device protection against adverse thermal conditions. PV22xS is designed to operate at ambient temperature of 10 C to 35 C.
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Page 29: Scsi Host Bus Adapters / Scsi Raid
5. SCSI Host Bus Adapters / SCSI RAID This section addresses concerns specific to RAID. A summarized table (Table 5-2) is presented at the end of the section which provides an overview of the Dell SCSI and RAID solutions that support PV22xS. -
Page 30: Controller Family
(see Table 5-2), there are a few critical differences which impact behavior of these controllers and hence a storage solution. Dell’s Storage controllers can be broadly categorized into two families – Adaptec PERCs and LSI PERCs. Design of these families impact the customer experience and may lead to ambiguities when configuring more complex storage strategies/solutions. - Page 31 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 In contrast, Adaptec controllers will only use space on all ‘child’ arrays equal to the available space on the smallest ‘child’ array, and will leave the remaining space on the larger drives unused and available, and the performance behavior will not be affected as the array fills up.
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Page 32: Data Protection Strategy
A dedicated hot spare is assigned to one or more arrays. Dedicated hot spares that reside in the same storage enclosure typically have better performance than global hot spares. Dell recommends using dedicated hot spares for critical data. • Consistency checks Consistency checks verify the correctness of redundant data in an array. -
Page 33: High Availability Needs - Clustering
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 For more details on rebuild process please refer to Appendix A – Reference 5: Maintenance Best Practices for Direct Attached SCSI Solutions • Patrol Read Patrol Read is a preventative maintenance background operation (available only on PERC 3 (except PERC 3/DI), PERC 4 and PERC 4e controller families running 3.0 and higher firmware). -
Page 34: Interface Channel Options - Internal/External/Multi Channel Device Configuration
Spanning of Arrays Dell’s PERC controllers provide additional array configuration options of spanning logical arrays. Dell supports spanning of logical arrays only across multiple channels on same PERC controllers. If multiple PV22xS are configured (Joined or Split topology - Figure 4-3a) on the same PERC then a logical array may be spanned across multiple PV22xS. -
Page 35: Capacity Needs - Virtual Disk Size
RAID50 at similar to spanned RAID5 SCSI channel level Note: Dell PERC controllers don’t support spanning of arrays across different controllers. Spanning across channels on the same PERC controller is only supported. Capacity Needs – Virtual Disk Size... - Page 36 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 Table 5-2 – Controller Families & Features: Part 1 PERC 4/Di PERC 4/Di PERC 4e/Di PERC 4e/DC (PE2600) (PE1750) SCSI Wide Wide Wide Wide Technology Ultra320 Ultra320 Ultra320 Ultra320 x4 PCI...
- Page 37 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 Table 5-2 – Controller Families and Features: Part 2 PERC 4/SC PERC 4/DC PERC 3/SC PERC 3/DCL SCSI Wide Ultra3 / Wide Ultra3 / Wide Ultra320 Wide Ultra320 Technology U160...
- Page 38 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 Table 5-2 – Controller Families and Features: Part 3 Adaptec PERC 3/DC PERC 3/QC PERC 3/Di PERC 2/QC 39160 Wide Wide Ultra3 / Wide Ultra3 / Wide Ultra3 / SCSI Technology...
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Page 39: Summary And Conclusions
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 6. Summary and Conclusions After analyzing and assessing the importance of all the storage components relative to attributes essential for performance of any given application, it can be observed that not... - Page 40 A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • Table 6-1: Typical Storage Recommendation for Different Storage Applications Application Storage Recommendations Remarks Servers Key Parameters RAID Level PV22xS Host Controller For added RAID10 * Availability Cluster Topology performance...
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Page 41: Appendix - A: References
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 7. Appendix – A: References ANSI T10/1365D SCSI Parallel Interface – 4 (SPI-4) and SCSI Block Commands – 2 (SBC-2) (http://www.t10.org) Dell™ PowerVault™ 220S and 221S Systems Documents (http://support.dell.com/support/edocs/stor-sys/spv22xs/en/index.htm) Dell ‘Getting Started with RAID’ document (http://support.dell.com/support/edocs/storage/RAID/RAIDbk0.pdf) -
Page 42: Appendix - B: Glossary
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 8. Appendix – B: Glossary Array – Collection of multiple physical Hard Disk Drives to form a single logical volume BBU – Battery Backup Unit BIOS – Basic Input Output System Cluster –... -
Page 43: Appendix - C: About The Dell Scsi Storage Solution Team
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 9. Appendix – C: About the Dell SCSI Storage Solution Team Authors David Papasan – International Product Support Gary Mott – PowerVault™ 22xS Product Engineering Manager John Woo – PowerVault 22xS Product Engineering Lead Mickey McGee –... -
Page 44: Appendix - D: Revision History
A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 10. Appendix – D: Revision History Revision Description Date Modified By SCSI Storage First Release 04/28/2005 Solution Team Updated “™” and “®” 05/06/2005 Samit Ashdhir information where applicable Updated requirement for...