Dell Emc Unity Best Practices Guide-Books Pdf

Dell EMC Unity Best Practices Guide
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The information in this publication is provided as is Dell Inc makes no representations or warranties of any kind with respect to the. information in this publication and specifically disclaims implied warranties of merchantability or fitness for a particular purpose. Use copying and distribution of any software described in this publication requires an applicable software license. Copyright 2019 Dell Inc or its subsidiaries All Rights Reserved Dell EMC and other trademarks are trademarks of Dell Inc or its. subsidiaries Other trademarks may be the property of their respective owners Published in the USA 01 19 White Paper H15093 5. Dell EMC believes the information in this document is accurate as of its publication date The information is subject to change without. TABLE OF CONTENTS, EXECUTIVE SUMMARY 5, AUDIENCE 5. SYSTEM CONFIGURATION 5, ESSENTIAL GUIDELINES 5, SAS CABLING AND DRIVE PLACEMENT 6. HOT SPARES 7, FRONT END CONNECTIVITY 7, HARDWARE CAPABILITY GUIDELINES 8. SIZING DELL EMC UNITY FOR PERFORMANCE REQUIREMENTS 11. DELL EMC UNITYVSA 11, STORAGE CONFIGURATION 11, GENERAL RECOMMENDATIONS FOR STORAGE POOLS 11. TRADITIONAL POOLS 12, DYNAMIC POOLS 13, STORAGE OBJECT TYPES 14.
FEATURES 14, FAST VP 14, FAST CACHE 15, DATA REDUCTION 15. ADVANCED DEDUPLICATION 15, SNAPSHOTS 16, THIN CLONES 16. ASYNCHRONOUS REPLICATION 16, SYNCHRONOUS REPLICATION METROSYNC FOR FILE 16. SAN COPY 17, DATA AT REST ENCRYPTION D RE 17, HOST I O LIMITS 17. APPLICATION CONSIDERATIONS 17, HOST ALIGNMENT FOR BLOCK LUNS 17.
VMWARE ESXi 18, VMWARE NFS DATASTORES 18, TRANSACTIONAL APPLICATIONS 18. SEQUENTIAL APPLICATIONS 18, CONCLUSION 18, REFERENCES 19. EXECUTIVE SUMMARY, The Best Practices Guide delivers straightforward guidance to customers using Dell EMC Unity storage systems in a mixed business. environment The focus is on system performance and maximizing the ease of use of the automated storage features giving guidance. to achieve optimal performance while avoiding non optimal configurations. These guidelines are intended to cover the majority of use cases They are strongly recommended by Dell EMC however they are not. strictly required In some cases it is completely acceptable not to adhere to them. Some exception cases are addressed in this guide however less commonly encountered edge cases are not covered by general. guidelines and are instead addressed in use case specific white papers. If you have questions about the applicability of these guidelines in your environment contact your Dell EMC representative to discuss. the appropriateness of the recommendations, This guide occasionally presents example configuration choices in order to demonstrate how a certain recommendation might be. applied Examples will be presented as follows, EXAMPLE Here is one possible way to apply the recommendation.
Examples presented in this way are intended to show one possible configuration option and do not necessarily represent a preferred. configuration, This document is intended for Dell EMC customers partners and employees who are installing and or configuring Dell EMC Unity. storage systems Some familiarity with Dell EMC unified storage systems is assumed. SYSTEM CONFIGURATION, ESSENTIAL GUIDELINES, Dell EMC Unity is a virtually provisioned Flash optimized storage system designed for ease of use This guide introduces specific. configuration recommendations that enable good performance from Dell EMC Unity At the highest level good performance design. follows a few simple rules The main principles of designing a Dell EMC Unity system for performance are. Maximize Flash capacity, Distribute workloads across available storage resources. Simplify the configuration, Design for resilience, Maintain latest released Dell EMC Unity Operating Environment version. MAXIMIZE FLASH CAPACITY, Dell EMC Unity utilizes the latest technology in multicore processors capable of high levels of storage performance In order to realize.
the performance potential Dell EMC recommends the use of Flash drives in all Dell EMC Unity systems The best way to harness the. power of Flash is to ensure as much dataset as possible resides on Flash drives Therefore Dell EMC recommends provisioning as. much Flash capacity as possible Use the largest Flash drives appropriate for your solution. DISTRIBUTE WORKLOADS ACROSS AVAILABLE RESOURCES, In order to maximize system performance eliminate individual bottlenecks by utilizing all hardware resources Spread Flash drives. across back end buses Build storage pools with many drives Balance LUN assignment and NAS Servers across both Storage. Processors SPs Spread host connections across as many front end ports as possible. SIMPLIFY THE CONFIGURATION, Designing for simplicity also increases the system s flexibility and leads to higher more consistent performance Using fewer storage. pools means that more drives can be devoted to any single workload in the pool possibly improving performance Standardizing on a. single capacity drive per tier rather than provisioning a system with multiple drive sizes for different purposes can reduce the number. of required hot spares see the Hot Spares section for more details make it possible to build larger pools and enable greater flexibility. for future reconfiguration if needed, When in doubt about the impact of certain configuration options selecting the recommended default is typically the best choice. DESIGN FOR RESILIENCE, Hardware can fail and Dell EMC Unity is architected to continue providing storage services under such conditions Understand the. hardware limitations of different components of the Dell EMC Unity system in order to design a solution that continues to provide good. performance under failure conditions Hardware capabilities of different components are provided later in this document. MAINTAIN LATEST RELEASED DELL EMC UNITY OPERATING ENVIRONMENT VERSION. Dell EMC regularly updates the Dell EMC Unity Operating Environment in order to improve performance enhance functionality and. provide new features Dell EMC recommends running the latest version on your Dell EMC Unity system. SAS CABLING AND DRIVE PLACEMENT, Dell EMC Unity systems have 2 on board 12Gb SAS ports in each of the SPs in the Disk Processor Enclosure DPE for connecting to.
Disk Access Enclosures DAEs A 4 port 12Gb SAS I O Module can also be provisioned in some Dell EMC Unity systems in order to. provide additional back end buses In general the on board SAS ports provide sufficient IOPS and bandwidth capabilities to support. most workloads The SAS I O Module should be considered in systems which will require extremely high bandwidth performance. greater than 10GB s will attach more than 19 DAEs will contain more than 500 drives or will attach an 80 drive dense enclosure. The SAS I O Module consumes an expansion slot that could otherwise be used for front end connectivity. When cabling DAEs to the DPE balance them as evenly as possible across all available buses The drives in the DPE are serviced by. SAS Bus 0 therefore the first DAE should be cabled to SAS Bus 1 When only the 2 SAS ports on each DPE are available it is. recommended to connect DAEs in the following order. DAE 1 connects to SAS Bus 1 on board port 1, DAE 2 connects to SAS Bus 0 on board port 0. DAE 3 connects to SAS Bus 1 on board port 1, Connect additional DAEs in the same rotation. When provisioning the 4 port SAS I O Module it is recommended to connect DAEs in the following order. DAE 1 connects to SAS Bus 1 on board port 1, DAE 2 connects to SAS Bus 2 I O Module port 0. DAE 3 connects to SAS Bus 4 I O Module port 2, DAE 4 connects to SAS Bus 3 I O Module port 1. DAE 5 connects to SAS Bus 5 I O Module port 3, DAE 6 connects to SAS Bus 0 on board port 0.
Once all buses have at least 1 connected DAE connect additional DAEs in the same rotation. 80 drive dense enclosures can connect and intermix with other DAEs When connecting multiple 80 drive enclosures to a system. place them on as many separate buses as possible before daisy chaining them on a single bus. 80 drive dense enclosures can also be connected with a high bandwidth option that utilizes 2 SAS buses per enclosure ganging them. together for higher performance This option is only available on Dell EMC Unity systems that support the SAS I O Module Dell EMC. recommends connecting these enclosures with this high bandwidth option when possible. Flash drives have the highest performance potential of any drive type Therefore Dell EMC recommends spreading Flash drives. across all available buses if possible to ensure the best IOPS and service times. HOT SPARES, Note that dynamic pools do not require dedicated hot spares See the Dynamic Pools section for additional considerations. When using traditional storage pools Dell EMC Unity automatically reserves 1 unbound drive out of every 31 drives of a given type for. use as a hot spare Note that hot spare drives have no special configuration they simply remain unbound Dell EMC Unity will not. allow a traditional storage pool to be created or expanded unless the available number of unbound drives is sufficient to create the. requested pool and continue to satisfy the hot spare policy Consider spare drive count requirements when designing traditional. storage pool layouts, Required hot spare count can be reduced by decreasing the number of individual drive types within the system Table 1 illustrates this. Table 1 Hot Spare Reservation Example, Drives for Traditional Storage Pools Total Required Spares. 9x 600GB SAS 15K, System 1 1x 600GB SAS 15K, 9x 1200GB SAS 10K. 25TB usable 1x 1200GB SAS 10K, 9x 1800GB SAS 10K, 1x 1800GB SAS 10K.
System 2 1 total, 27x 1200GB SAS 10K, 25TB usable 1x 1200GB SAS 10K. Note that Dell EMC Unity will throttle hot spare rebuild operations to reduce the impact to host I O Rebuilds will occur more quickly. during periods of low system utilization, FRONT END CONNECTIVITY. Dell EMC Unity provides multiple options for front end connectivity via on board ports directly on the DPE and via optional I O. Modules This section discusses recommendations for the different types of connectivity. In general front end ports need to be connected and configured symmetrically across the 2 storage processors SPs in order to. facilitate high availability and continued connectivity in case of SP failure. EXAMPLE A NAS Server is configured so that NAS clients connect via port 0 of the first I O Module on SPA therefore port 0. of the first I O Module on SPB must be cabled so that it is accessible to the same networks. For best performance it is recommended to use all front end ports that are installed in the system so that workload is spread across as. many resources as possible, EXAMPLE If configuring the 4 port Fibre Channel I O Module zone different hosts to different ports so that all 8 ports across. the 2 SPs are utilized don t simply zone all hosts to the first port of each I O Module. FIBRE CHANNEL, When configured for Fibre Channel Dell EMC Unity CNA ports and I O Module ports can be configured with 8Gb or 16Gb SFPs All. Fibre Channel ports can negotiate to lower speeds 16Gb FC is recommended for the best performance. Dell EMC recommends single initiator zoning when creating zone sets For high availability purposes a single host initiator should be. zoned to at least 1 port from SPA and 1 port from SPB For load balancing on a single SP the host initiator can be zoned to 2 ports. from SPA and 2 ports from SPB When zoning additional host initiators zone them to different SP ports when possible to spread the. load across all available SP ports, Utilize multi pathing software on hosts connected via Fibre Channel such as Dell EMC PowerPath which coordinates with the Dell.
EMC Unity system to provide path redundancy and load balancing. Dell EMC Unity supports iSCSI connections on multiple 1Gb s and 10Gb s port options 10GBase T ports can auto negotiate to 1Gb s. speeds 10Gb s is recommended for the best performance If possible configure Jumbo frames MTU 9000 on all ports in the end to. end network in order to provide the best performance. To achieve optimal iSCSI performance use separate networks and VLANs to segregate iSCSI traffic from normal network traffic. Configure standard 802 3x Flow Control Pause or Link Pause on all iSCSI Initiator and Target ports that are connected to the. dedicated iSCSI VLAN, Dell EMC Unity supports 10GbE and 1GBase T ports that provide iSCSI offload Specifically the CNA ports when configured as. 10GbE or 1GBase T and the 2 port 10GbE I O Module ports provide iSCSI offload Using these modules with iSCSI can reduce the. protocol load on SP CPUs by 10 20 so that those cycles can be used for other services. Utilize multi pathing software on hosts connected via iSCSI such as Dell EMC PowerPath which coordinates with the Dell EMC Unity. system to provide path redundancy and load balancing. Dell EMC Unity supports NAS NFS FTP and or SMB connections on multiple 1Gb s and 10Gb s port options 10GBase T ports can. auto negotiate to 1Gb s speeds 10Gb s is recommended for the best performance If possible configure Jumbo frames MTU 9000. on all ports in the end to end network in order to provide the best performance. Dell EMC recommends configuring standard 802 3x Flow Control Pause or Link Pause on all storage ports switch ports and client. ports that are used for NAS connectivity, Dell EMC Unity provides network redundancy for NAS via Link Aggregation Control Protocol LACP and Fail Safe Networking FSN. Dell EMC Unity systems have 2 on board 12Gb SAS ports in each of the SPs in the Disk Processor Enclosure DPE for connecting to Disk Access Enclosures DAEs A 4 port 12Gb SAS I O Module can also be provisioned in some Dell EMC Unity systems in order to provide additional back end buses In general the on board SAS ports provide sufficient IOPS and bandwidth capabilities to support most

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