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FAST VP (Fully Automated Storage Tiering for Virtual Pools) and FAST Cache (Fully Automated Storage Tiering for Cache) are features that allow you to optimize the performance of your storage by automatically moving data between different storage tiers based on usage patterns. The SSD tier is used to store frequently accessed metadata, such as file system structures, directories, and inode tables, which are accessed frequently and are small enough to fit in the SSD cache. Keeping paged metadata on flash media improves the overall system performance, as it allows for faster access to the metadata, reducing the latency and the number of I/O operations needed to access it.

References:
https://www.delltechnologies.com/asset/en-gb/products/storage/industry-market/h15093-dell_emc_unity-best_practices_guide.pdf

Dell is providing native support of NVMe to the midrange of the market, which improves performance.
References:
https://www.datacenterknowledge.com/dell-emc/dell-launches-new-midrange-all-flash-enterprise-storage-arrays

The entire capacity of a particular drive size is only available when the drive count within the drive partnership group for the drive in question matches or exceeds the stripe width plus one drive. It is not recommended to mix different size drives of the same type for this reason, unless an adequate number of drives are available to meet or exceed the stripe width plus one drive requirement h16289-dell_emc_unity-dynamic_pools.pdf-Page 18-19

Choosing the highest capacity flash drives when designing a Dell Unity XT All-Flash system can provide several benefits, including lower physical space, power and cooling requirements. Additionally, higher capacity drives can also improve system boot time, reduce maintenance and rebuild time, and decrease wear-leveling, performance, and redundancy requirements.

"The engineer should design a system to handle all, or nearly all, IOPS in one particular tier"

https://elabnavigator.emc.com/vault/pdf/EMC_Unity_ESSM.pdf
(pag.22)

"Removing a replication session is initiated on the source system by removing the protection policy from the Volume or Volume Group on the source system. Removing the protection policy from a storage resource results in the following: * The destination storage resource stays in read-only mode."

Reference;
https://www.delltechnologies.com/en-ba/collaterals/unauth/white-papers/products/storage/
h15089-dell_emc_unity-snapshots_and_thin_clones.pdf (7)

References:
https://www.delltechnologies.com/asset/en-us/products/storage/industry-market/h18157-dell-emc-powerstore-clustering-high-availability.pdf

Dell PowerStore supports a variety of NAS protocols to provide file access to clients. These protocols include: SMB (Server Message Block): This protocol is used to provide file and printer sharing on Windows-based systems.
NFSv3 (Network File System version 3): This is a standard protocol used to provide file access on UNIX-based systems.
NFSv4 (Network File System version 4): This is the latest version of the NFS protocol and it provides enhanced security and improved performance over previous versions.
FTP (File Transfer Protocol): This is a standard protocol used to transfer files between computers over a network.
SFTP (Secure File Transfer Protocol): This is an extension of the FTP protocol that provides secure file transfer using SSH (Secure Shell) encryption.

A thin clone is a writeable copy of a volume, which shares the same data blocks as the parent volume.
This allows the administrator to provide a copy of the production database volume to the test environment without affecting the production data. It also allows to test the data without affecting the production data, and also it doesn't require additional storage space.

https://delltechnologies.techdata.nl/app/uploads/2019/02/dell-emc-unity-xt-selling-guide.pdf

https://dl.dell.com/topicspdf/sc-7-3_rn_en-us.pdf

References:
https://www.delltechnologies.com/en-us/blog/storage-center-os-7-3-brings-big-performance-boost-to-sc-series-arrays/

3.4.4 SAS SSD
References:
https://www.delltechnologies.com/asset/en-us/products/storage/industry-market/h18149-dell-emc-powerstore-platform-introduction.pdf

The Dell Unity XT 380F has a default spare space allocation of 4% of the total number of drives in a dynamic pool. So with 90x 1.92 TB SSDs, 4 drives will be allocated as spare space. These spare drives are used to automatically replace a failed drive, ensuring data availability and protection.

"When positioning the 380 and 380F, keep in mind that they are not NVMe-ready and will not be upgradeable to support NMVe in the future.".

References:
https://downloads.dell.com/manuals/common/sc-series-performance-availability-best-
practices-dell-emc-4024-bp-sc_en-us.pdf (15)