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Upgrading to Dell/EMC CX4 Series Storage Systems

Applied Technology 6

CAP2 Conversion Readiness Check

The CAP2 tool includes a conversion readiness check (CRC). The CAP2 CRC automatically checks to see if an

existing CX or CX3 series system is ready to be converted to a CX4 series system. CRC makes sure that no LUNs

are in conflict with the expanded FLARE space, port usage is not in conflict, and array limits will not exceed those

of the new platform. If LUNs are in conflict with the expanded FLARE space, consult the ―Reserved space

expansion‖ section below.

You should check the overall condition of the storage system using the (CAP2) tool to ensure that there are no

trespassed LUNs, hardware failures, cabling issues, and so forth, as these may complicate the upgrade. Resolve any

issues before attempting the upgrade.

The CAP2 CRC is not a complete check of all considerations; it is the responsibility of the presales account team to

read this paper and identify what actions are required prior to an upgrade. For a sample of a CRC report, please see

―Appendix A: Example CX4 Conversion Readiness Check‖ at the end of this whitepaper.

Adequate FLARE revision and storage system health

Specific changes have been made in the FLARE operating environment to enable the conversions; therefore, the

FLARE revision may need to be updated before the conversion can be performed. Reference the Procedure

Generator for the minimum release and patch level required for each hardware platform.

In addition to the FLARE minimum revision requirement, please ensure that all applicable field change orders

(FCOs) have been carried out prior to the system upgrade. Also, it is important that any open EMC

Technical

Advisories (ETAs) that are applicable to the storage system are addressed and resolved before the data in place

upgrade is attempted.

Disk compatibility with the new FLARE revision

The majority of data-in-place upgrades, especially an upgrade to a CX4 from a CX or CX3 array, will result in a

newer revision of FLARE running on the upgraded system. It is important to verify before the upgrade that all disks

in the system are compatible with the new model and FLARE revision. The document CX4 Series Storage Systems

Disk and FLARE OE Matrix on EMC Powerlink lists the minimum FLARE revision required for each drive.

The existing disks can be easily inventoried for this purpose by using the following Navisphere Secure CLI

command:

C:\>naviseccli -h <SP IP address> getdisk -tla

Bus 0 Enclosure 0 Disk 0

Dell/EMC TLA Part Number:005048646

The output of this example is truncated, but the getdisk command will return information for all disks in the system.

The part numbers returned can be matched up with those in the CX4 Series Storage Systems Disk and FLARE OE

Matrix.

Reserved space expansion

With the CX4 series, the space reserved by FLARE on the first five drives has grown to approximately 62 GB per

drive. This allows for new features, expansion of existing features, and growth in the future. Therefore, if the

upgrade is from a CX or CX3 series storage system with LUNs bound on the first five drives, those LUNs are most

likely located where FLARE needs to expand. Furthermore, if the system drives are 36 GB drives, you must replace

them with 146 GB (or larger) drives before the conversion.

A new CX4 conversion readiness check report has been added to the CAP2 tool (see the sample in ―Appendix A:

Example CX4 Conversion Readiness Check‖) to automatically check LUN placement. The output is a listing of all

LUNs that would conflict with the new FLARE reserved space. Dell recommends using virtual LUN technology

(LUN migration) to relocate these LUNs. There are some special LUNs used by replication software that may not be

moved using virtual LUN technology; these are known as private LUNs. If you are using replication software,

please see the ―Special Considerations for Replication Software‖ section.

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