Dell DAE User Manual download pdf (Page 12)

Upgrading to Dell/EMC CX4 Series Storage Systems

Applied Technology 12

NAS data LUNs should be moved to a RAID group not already containing NAS LUNs to avoid performance

conflicts with other defined NAS data LUNs.

NAS data LUNs should be migrated to target disk technology compatible with the source to avoid performance

issues. For example, LUNs currently on Fibre Channel disk should be migrated to Fibre Channel disk.

The NAS control LUNs should be migrated back to the original RAID groups if there is sufficient space to

accommodate NAS control LUNs after the CX, or CX3, to CX4 conversion.

Backup

Before the upgrade, a full backup of all data on the storage system is recommended. This includes retrieving SP

collects from each SP, which CAP2 does when running the conversion readiness check.

Performing the Upgrade

A Dell service professional or service partner performs the data-in-place upgrade by following the Procedure

Generator. Dell technical support should be contacted if there are any issues during the upgrade.

System Scaling after the Upgrade

Following an upgrade, it is possible to add additional DAEs and disks to existing back-end loops or to new loops if

they are available. Disks added to existing 2 Gb/s back-end loops operate at 2 Gb/s. Disks added to new back-end

loops may run at 4 Gb/s if the disk is capable of running at this speed. Once disks are added, data can be reorganized

within the Dell/EMC by using metaLUNs or LUN migration to spread existing data to new drives.

Depending on the upgrade path, the new system may have more fibre and/or iSCSI ports than the previous system.

These ports may be used to expand the storage system’s connectivity to new SANs or direct-attached hosts.

Customers should check the current memory allocation to read and write cache and increase the allocations if

possible on the new system.

The number of LUNs, number of connected hosts, or allowed number of replication sessions may also be increased.

For these limits, see the Open Systems Configuration Guide.

Conclusion

Dell continues to bring Dell/EMC customers extensive investment protection and deployment flexibility. By

providing a clear upgrade path of features, functionality, and performance—on both a software and a hardware

level—the Dell/EMC product line continues to meet customer demands for pay-as-you-grow features and

functionality. Customers who start with a CX or CX3 series storage system can upgrade to a CX4 series storage

system, while keeping their data in place. Within the CX4 series, customers can start small and upgrade to a larger

system for increased performance, functionality, and scalability. With consistent hardware and software

architectures, customers can keep their business process in place while their applications and processes grow.

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

No comments

Dell DAE User Manual Page 12