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E20-526
XtremIO Solutions and Design Specialist Exam for Technology Architects Questions and Answers

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Questions # 11:

A customer has purchased a two X-Brick XtremIO array with a physical XtremIO Management Server (XMS). The customer plans to use all Fibre Channel connectivity in the environment.

What are the physical connectivity requirements for the cluster?

Options:

1 Copper Ethernet connection, 4 Fibre Channel Optical connections

3 Copper Ethernet connections, 8 Fibre Channel Optical connections

4 Copper Ethernet connections, 16 Fibre Channel Optical connections

5 Copper Ethernet connections, 8 Fibre Channel Optical connections

Answer

Explanation

EMC XTREMIO 4.0 SYSTEM SPECIFICATIONS

References:http://www.aecl.com/AECWeb/media/Assets/PDF/h12451-xtremio-4-system-specifications-ss.pdf

Questions # 12:

A customer has the following requirements for their VDI deployment:

Greater than 1000 desktops with the ability to grow 10% for the next 3 years

Low latency boot volumes

General purpose NAS for home directories

Remote replication with the ability to snap at every write

Capable of delivering 100 IOPs per desktop

Which EMC technologies should be recommended?

Options:

XtremIO, RecoverPoint CRR, and VPLEX only

VSPEX Blue, RecoverPoint CDP, and VNX

Isilon, VSPEX Blue, VPLEX, and RecoverPoint CDP

XtremIO, RecoverPoint CRR, VPLEX, and Isilon

Answer

Explanation

The EMC RecoverPoint family provides cost-effective, local continuous data protection (CDP), continuous remote replication (CRR), and continuous local and remote replication (CLR) that allows for any-point-in-time data recovery and a new "snap and replicate" mechanism for local and remote replication (XRP).

Splitter-based replication, using VPLEX

RecoverPoint splitter-based replication provides synchronous replication, continuous replication with fine recovery granularity (journal based), and replication for active-active datacenters.

References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 52

Questions # 13:

A customer is considering migrating their existing non-EMC storage arrays to an XtremIO array. The current environment consists of 350 servers running VMware ESXi 5.5 with 5000 virtual machines. The customer has various tools in place to monitor performance and collect statistics. On average, their service time is 32 ms and utilization is at 75%. In the past, the customer has had performance issues.

Based on Little’s Law, what is the calculated response time on the existing environment?

Options:

128 ms

192 ms

256 ms

332 ms

Answer

Explanation

Disk service time T(s) = 32 ms (service time for one I/O).

Response time T(r) is calculated as: T(s) / (1 – Utilization), which here calculates to 32 ms/ (1-0.75) = 128 ms.

References:https://community.emc.com/thread/145100?tstart=0

Questions # 14:

What are common storage array mechanisms?

Options:

Log structuring and RAID

Post-processing and metadata logging

RAID and metadata log structuring

Metadata logging and RAID

Answer

Explanation

XtremIO's snapshot technology is implemented by leveraging the content-aware capabilities of the system (Inline Data Reduction), optimized for SSD media, with a unique metadata tree structure.

XtremIO leverages a proprietary flash-optimized data protection algorithm (XtremIO Data Protection or XDP), which provides performance that is superior to any existing RAID algorithm.

References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 33

Questions # 15:

You need to design an Oracle solution for a customer. Which XtremIO best practices should be used in Oracle environments?

Options:

Use a 512 byte LUN sector size for databases. Use Eager Zeroed Thick formatting for ESXi

Use a 4 kB LUN sector size for databases. Use Lazy Zeroed Thick formatting for ESXi

Align data on 4 kB boundaries. Use Thin formatting on ESXi

Align data on 4 kB boundaries. Use Lazy Zeroed Thick formatting on ESXi

Answer

Explanation

The default setting for XtremIO volumes is 512e. It is recommended not to alter this in order to use 4K Advanced Format for Oracle Database deployments. There are no performance ramifications when using 512e volumes in conjunction with an Oracle database. On the contrary, 4K Advanced Format is rejected by many elements of the Oracle and Linux operating system stack.

References:https://www.emc.com/collateral/white-papers/h13497-oracle-best-practices-xtremio-wp.pdf , page 20

Questions # 16:

Which operation is performed when an XtremIO Snapshot is created?

Options:

Pointers to the ancestor metadata are created for the snapshot

Space equal to the size of the ancestor is allocated to the snapshot

A reserved space is created for new snapshot data

A deduplication pass is immediately run against the snapshot

Answer

Explanation

When a snap is created, the following steps occur:

1) Two empty containers are created in-memory

2) Snapshot SCSI personality is pointing to the new snapshot sub-node

3) The SCSI personality which the host is using, is linked to the second node in the internal data tree

References: EMC RECOVERPOINT REPLICATION OF XTREMIO, Understanding the essentials of RecoverPoint Snap-based replication for XtremIO, page 8

https://www.emc.com/collateral/white-papers/h14296-wp-recoverpoint-replication-of-xtremio.pdf

Questions # 17:

What is considered typical performance for an XtremIO single X-Brick cluster?

Options:

Small block writes: 200k-250k IOPs. Large block reads: up to 2.5 GB/s

Small block writes: 200k-250k IOPs. Large block writes: up to 2.5 GB/s

Small block reads: 200k-250k IOPs. Large block writes: up to 2.5 GB/s

Small block reads: 200k-250k IOPs. Large block reads: up to 2.5 GB/s

Answer

Explanation

Choose an EMC XtremIO system and scale out linearly by adding more XtremIO X-Bricks.

References: https://store.emc.com/en-us/Product-Family/EMC-XtremIO-Products/EMC-XtremIO-All-Flash-Scale-Out-Arra y/p/EMC-XtremIO-Flash-Scale-Out

Questions # 18:

Who developed the framework for testing All-Flash arrays that is used in the XtremIO PoC?

Options:

EMC

Seagate

Micron

IDC

Answer

Explanation

IDC outlines a criteria some criteria for selecting a testing tool:

* Generate workloads

* Capture results for analysis:

Throughput

IOPS

Latency

Etc.

References:http://info.xtremio.com/rs/xtremio/images/IDC_Flash_Array_Test_Guide.pdf

Questions # 19:

A customer has a group of applications that need storage which can provide low response times. The total I/O requirements are 75,000 IOPs with a 4 kB block size. They will have 500 LUNs and need to keep 30 daily snapshots of each LUN.

What is the smallest XtremIO configuration that will meet their needs?

Options:

1 cluster with 2 X-Bricks

1 cluster with 4 X-Bricks

2 clusters with 1 X-Brick each

2 clusters with 2 X-Bricks each

Answer

Questions # 20:

A customer has two XtremIO clusters running 3.x software release. The customer just purchased a new XtremIO array that will be installed with the latest 4.x software release.

What is the minimum number of XtremIO Management Server(s) that will be required to manage all clusters?

Options:

Answer

Explanation

The system operation is controlled via a stand-alone dedicated Linux-based server, called the XtremIO Management Server (XMS). A single XMS can manage multiple clusters. Multiple cluster management is supported from version 4.0 and up. System version 4.0 supports up to eight clusters managed by an XMS in a given site.

References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 48

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