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Table Of Contents
VMware Virtual SAN Cookbook
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The magnetic disks or SSDs you choose will be used for storage capacity and persistent data that is destaged from cache. This is the capacity tier within VSAN, whereas the caching tier SSD will act as the performance caching layer.
In general, you will want to select magnetic disks or SSDs that have adequate capacity to fit your needs. For highly dynamic workloads where data will be frequently destaged from the SSD write buffer and fetched into the SSD read cache, HDD performance is important and you may wish to go with faster disks and/or SAS disks. Only SAS and SATA disks are supported for use with VSAN.
You should be on the VMware VSAN Compatibility Guide component page.
The Compatibility Guide for SSD is navigated in the same way as for the I/O controller

In general, SAS disks outperform SATA disks of equivalent capacities and/or rotational speeds because SAS drives use more robust recording technique, deeper queues or both. When cost is a concern, slower SAS drives (typically 7200 RPM; also called near-line SAS or NL-SAS) are usually built on cheaper SATA platforms but include enterprise-grade features like deeper command queues, error-correction, dual-channel connections and native SCSI support. Low-end SAS drives are typically better than high-end SATA drives despite the shared technology platform and costs are usually not significantly higher. NL-SAS is a great alternative to SATA for building out a cost-conscious capacity tier when HDD performance is a factor.
Before settling on a Cache + Capacity disk combination, please review the Chapter 1 – VSAN Capacity Planning section of Appendix A, Chapter-specific Expansions for a verbose description of the capacity expectations and recommended maximums to help you build your VSAN cluster to an appropriate scale.
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