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Upgrading to Dell/EMC CX4 Series Storage Systems

Applied Technology 4

Disk Processor Enclosure (DPE) – An enclosure that holds one or two storage processors, power and cooling

modules, and up to 15 disks. Specific to the CX300, CX500, AX4 storage systems.

Upgrading vs. Buying New

The main reason to upgrade an existing system is to enhance the existing investment in disks, disk enclosures, and

cabinets by adding capacity, performance, and functionality. All existing equipment remains in place and only the

storage processors (SPs), and potentially the standby power supplies (SPS), are exchanged. Another major benefit is

that all data and configuration remain on the system (―data-in-place‖). This eliminates any risks that may be incurred

by requiring a data migration, and saves the time that would be required to configure a new system. When the

upgrade is completed and the new system is booted, all data is available and all hosts have access to their LUNs.

One consideration for upgrading from a CX (or CX3 that has been upgraded from a CX) system is that existing

back-end loops are always 2 Gb/s. This may not be a concern if the storage system is not servicing high-bandwidth

applications and 2 Gb/s back-end connectivity is not the limiting factor. For example, performance in a small-block

random I/O environment (most databases) does not differ greatly between systems with 2 Gb/s or 4 Gb/s back-end

loops. If upgrading to a system with additional back-end loops (for example, upgrading from a CX500 with two

pairs of back-end loops to a CX4-480 with four pairs of back-end loops), the new back-end loops may be run at 4

Gb/s while the existing back-end loops remain at 2 Gb/s.

For customers who want to invest in a full 4 Gb/s storage system, purchasing a new CX4 series system is a better

choice than upgrading. This gives customers the performance benefits of an end-to-end 4 Gb/s storage system and

the ability to repurpose their existing storage investment in another application. There are many solutions for data

migration to a new system that can minimize application downtime.

To summarize, customers should perform a data-in-place upgrade if their objectives are to:

Add capacity, performance, or functionality to their existing hardware.

Leverage their existing hardware investment.

Avoid configuring a new storage system.

Avoid data migration to a new storage system.

Customers should buy a new CX4 series storage system if their objectives are to:

Invest in an end-to-end 4 Gb/s storage system.

Redeploy the existing system in another application.

Data-in-Place Upgrades

Dell/EMC storage systems offer the investment protection of data-in-place upgrades. These upgrades allow

customers to preserve their existing disks, DAEs, and cabinets, as well as data and software configurations. A

customer who has purchased a CX or CX3 series storage system can upgrade to a CX4 series system to add

performance, functionality, and scalability. Table 1 shows the valid upgrade paths at the time of this paper's

publication.

A data-in-place upgrade typically consists of a storage processor conversion and a software conversion/upgrade.

Upon completion of the upgrade, the new system has the same identity as the old system and all data and the

configuration are preserved. No host or SAN reconfiguration is necessary, but there may be suggested software

updates to Dell PowerPath

, Navisphere

Agent, and Navisphere CLI to operate with the new FLARE revision.

Table 1. Currently supported conversions to CX4 series storage systems

1 2 3 4 5 6 7 8 9 ... 15 16

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