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Upgrading to Dell/EMC CX4 Series Storage Systems

Applied Technology 11

The following NAS command initiated on the connected NAS device(s) will list the Dell/EMC disk volumes owned

by an individual Celerra:

[nasadmin@eng25214 bin]$ nas_disk -list

id inuse sizeMB storageID-devID type name servers

1 y 11263 APM00063304671-0000 CLSTD root_disk 1,2

2 y 11263 APM00063304671-0001 CLSTD root_ldisk 1,2

3 y 2047 APM00063304671-0002 CLSTD d3 1,2

4 y 2047 APM00063304671-0003 CLSTD d4 1,2

5 y 2047 APM00063304671-0004 CLSTD d5 1,2

6 y 2047 APM00063304671-0005 CLSTD d6 1,2

7 y 521539 APM00063304671-0010 CLSTD d7 1,2

8 y 521539 APM00063304671-0011 CLSTD d8 1,2

15 n 1099246 APM00063304671-0012 CLSTD d15

16 n 1099246 APM00063304671-0013 CLSTD d16

17 n 549623 APM00063304671-0014 CLSTD d17

18 n 1099246 APM00063304671-0016 CLSTD d18

19 n 549623 APM00063304671-0015 CLSTD d19

20 n 1099246 APM00063304671-0017 CLSTD d20

The storageID-devID information must be used to determine if the LUNs to be migrated (as reported by the CAP2

report) are NAS LUNs.

The NAS control LUNs are reserved LUNs for the NAS operating system and operational database located on the

back-end storage. The Celerra control LUNs currently use approximately 30 GB of Dell/EMC storage. A typical

control LUNs configuration is as follows:

Two 11 GB LUNs

Four 2 GB LUNs

Celerra control LUNs for current NAS implementations always have IDs 1-6 in the output of the ―nas_disk –list‖

command. The remaining IDs in the listing above are the data LUNs associated with the Celerra. After the control

and data LUNs have been identified, the EMC identifier and ALU can be used to map the NAS LUNs back to the

Dell/EMC array. The ALU directly corresponds to the LUN# column in the CAP2 CX4 conversion readiness check

report.

If NAS LUNs are identified for migration the following considerations apply:

LUN migration must be used to execute migration of NAS LUNs. The recommended priority for the LUN

migration is high. This provides the best balance between application response time and the time for LUN

migration to complete. Refer to ―Appendix B: Virtual LUN Migration Performance‖ on page 16 for LUN

migration rates.

NAS control LUNs must be migrated to Fibre Channel drives

NAS control LUNs must be moved to a single RAID group.

NAS control and data LUNs must be migrated to a RAID group of the same geometry. For example, LUNs on a

RAID 5 4+1 must be migrated to another RAID 5 4+1. Refer to EMC knowledgebase article emc160173 for

additional information.

NAS control and data LUNs must be migrated to LUNs with identical block counts. Refer to EMC

knowledgebase article emc157859 for additional information.

APM00063304671-0000

EMC

Identifier

ALU

1 2 ... 6 7 8 9 10 11 12 13 14 15 16

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