Asustor Flashstor

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When it comes to purchasing NVMe storage, it's essential to understand the type, brand, and speed that will best suit your needs. Asustor Flashstor supports M.2 NVMe SSDs, so you'll want to ensure compatibility with this form factor. To determine how much memory or NVMe storage to buy, it depends on your specific requirements and budget. Consider factors such as the amount of data you plan to store and the performance you desire. As for the lifespan of NVMe memory, it generally has a long life expectancy, but it's crucial to consider endurance ratings, such as DWPD (Drive Writes Per Day) and MTBF (Mean Time Between Failures). NVMe drives with higher DWPD ratings are generally more durable for caching purposes, which involve frequent read and write operations. In terms of longevity, NVMe drives can be comparable to traditional hard drives (HDDs), but it's important to note that the lifespan depends on various factors, including usage patterns, workload, and manufacturer quality. Lastly, there are NVMe drives specifically designed for NAS systems, known as NAS NVMe drives. These drives are optimized for use in network-attached storage, providing enhanced performance and compatibility. It's recommended to research and choose reliable brands and models that meet your requirements and have good user reviews to ensure a satisfactory experience with your Flashstor setup.

When choosing NVMe for caching you need to look at reliability ratings such as DWPD/MTBF. Here are a few on the list
https://nascompares.com/answer/nvme-m-2-...dwpd-mtbf/
Caching means a lot of read and write operations, unlike regular storage situation.
You would need to look at models with 0.5DWPD and above

970 pro – 0.66DWPD

Synology SNV3400 – 0.68DWPD

Seagate FireCuda 510 – 0.7 DWPD
Seagate IronWolf 525 – 0.7 DWPD
Seagate Firecuda 530 – 0.7 DWPD
Seagate PS5 Game drive – 0.7 DWPD

Seagate FireCuda 520 -0.9 DWPD
WD Red SN700 – 1.0DWPD

I hope this helps.