When the cache space fills up, I/O will be queued until an empty cache slot is available. This is because PowerMax operates as a cache-centric architecture, where all data is passed through cache before being stored on disk. Cache is used to buffer incoming and outgoing data, as well as to support various functions such as replication and data reduction. When cache is full, the array cannot accept any more data until some cache slots are freed up by flushing data to disk or invalidating stale data. Therefore, answer B is correct.

A, C, and D are incorrect because they do not describe what happens when cache space fills up. I/O will not be serviced at the speed of the destination device (A), as this would bypass the cache and degrade performance. Cache is not permanently flushed © or temporarily disabled (D), as this would result in data loss or corruption.

The steps in sequence as part of key management for a drive failure on a PowerMax array are as follows:

Spare drive invoked against failed drive. This step involves the system automatically selecting a spare drive and starting the sparing operation to rebuild the data from the failed drive. The spare drive is encrypted with a temporary key that is stored in the embedded key manager. 1

1st entry in audit log. This step involves the system logging the sparing operation and the temporary key generation in the audit log, which records all key management activities and events. 1

Sparing operation is completed. This step involves the system completing the data rebuild and marking the spare drive as a permanent replacement for the failed drive. The spare drive becomes part of the RAID group and inherits the same properties as the failed drive. 1

Key is deleted from the repository when failed drive is removed. This step involves the system deleting the Data Encryption Key (DEK) of the failed drive from the embedded key manager when the failed drive is physically removed from the array. The DEK is a unique 256-bit AES-XTS key that is used to encrypt and decrypt data on each drive. 1

2nd entry in audit log. This step involves the system logging the DEK deletion and the failed drive removal in the audit log. 1

Key is generated for the replacement drive when installed. This step involves the system generating a new DEK for the replacement drive when it is installed in the array. The new DEK is stored in the embedded key manager and used to encrypt and decrypt data on the replacement drive. 1

References:

Dell EMC PowerMax and VMAX All Flash: Data at Rest Encryption

  The most likely cause of this behavior is QFULL responses of the FA ports. When additional hosts are zoned to certain front-end adapters, the FA ports may not be able to handle the increased I/O requests, resulting in QFULL responses. This can cause non-linear variations in throughput and sometimes a drop in throughput of more than 20%.  References:  Dell EMC PowerMax: Service Levels for PowerMaxOS

The feature of PowerMax and VMAX All Flash arrays that provides ORM functionality is write coalescing. ORM stands for Optimized Resource Management, which is a set of technologies that optimize the performance and efficiency of flash storage. Write coalescing is one of the ORM technologies that reduces the write amplification and extends the life of flash drives. Write coalescing combines multiple small writes into larger sequential writes before destaging them to the flash drives. This reduces the number of write operations and the amount of data that needs to be erased and rewritten on the flash drives, which improves the performance and endurance of the flash storage.

References:

Dell EMC PowerMax: Family Overview

Dell EMC PowerMax and VMAX All Flash: Data Reduction

Dell EMC PowerMax and VMAX All Flash: Embedded Management

While using DELL EMC Data Erasure on a PowerMax, the minimum number of overwrites needed to support compliance with internal policies and regulatory requirements is 3. The application has prompts and notifications.  Such as the option to choose the number of Media Eraser ‘wipes’ (3x times, 5x times or 7x times) 1 .  References:  Dell EMC Community Network

Before configuring Access Control, the security administrator must define the User Access ID for the Admin User. This is a necessary step to ensure that the administrator has the necessary permissions to perform this operation.

PowerMax & VMAX All-Flash Storage Technical Documentation ,  Dell EMC PowerMax and VMAX All Flash: Embedded Management