D-VPX-DY-A-24 Exam Dumps : Dell VPLEX Deploy Achievement

"The MetroPoint topology can maintain up to five copies of data, including one remote copy and one local copy at each VPLEX site. It provides protection for each of the VPLEX Metro sites with continuous local replication via RecoverPoint"..

To expand a RAID-C device that has been built from extents of unequal sizes, such as a 100 GB extent and a 30 GB extent, concatenation can be used. Concatenation allows for the addition of another extent to the existing RAID-C device, thereby increasing its overall size.

Understanding RAID-C: RAID-C is a type of RAID configuration used in VPLEX that allows for concatenation, which is the process of linking multiple storage extents to create a larger logical unit1.

Adding an Extent: To expand the RAID-C device, a new extent of the desired size can be added to the existing device. This new extent is concatenated to the end of the current extents, increasing the total capacity of the RAID-C device1.

VPLEX CLI Commands: The expansion is performed using VPLEX CLI commands. The specific command to add an extent to a RAID-C device would be similar to the storage-volume expand command, which instructs the system to include the new extent in the RAID-C device1.

Resizing Back-End Storage: If necessary, the back-end storage volumes (the physical storage on the array) that correspond to the extents may need to be resized to match the new configuration1.

Verification: After the expansion, it’s important to verify that the RAID-C device reflects the new size and that all extents are properly concatenated and functioning as expected1.

In summary, a RAID-C device built from extents of unequal sizes can be expanded by using concatenation to add another extent to the device. This method allows for flexibility in managing storage capacity within a VPLEX environment.

EMC recommends specific best practices for connecting VPLEX to back-end storage arrays to ensure high availability and optimal performance. One of these best practices is that each VPLEX director should have four active paths to every back-end array storage volume.

Multiple Paths: Having multiple active paths from each VPLEX director to the storage volumes ensures that there is no single point of failure. If one path fails, the other paths can continue to provide connectivity1.

Load Balancing: Multiple paths also allow for load balancing of I/O operations across the different paths, which can improve performance and reduce the risk of bottlenecks1.

Path Redundancy: Path redundancy is crucial for maintaining continuous availability, especially in environments where the VPLEX is used for mission-critical applications1.

Configuration: The configuration of the paths should be done in accordance with EMC’s best practices, which include proper zoning and masking in the SAN environment1.

Documentation: Detailed guidelines and best practices for VPLEX SAN connectivity, including back-end array connections, are available in EMC’s documentation, which provides comprehensive instructions for setting up and managing these connections1.

In summary, EMC’s best practice for connecting VPLEX to back-end arrays is to ensure that each VPLEX director has four active paths to every back-end array storage volume. This setup provides the necessary redundancy and performance for a robust and reliable storage environment.

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