Hi ,
Due to the limitations of the laboratory environment, I cannot directly test the applicable SSD SAN Disk to configure the MCDB function in Exchange 2019. But based on my research on official articles, the article clearly states that SSDs need to be used to set up, and each server needs to have the same number, same size and type of SSD. And we need to run the following command to set up the MCDB, so it's suggest you using the SSD to configure the MCDB.
Manage-MCDB -DagName <> -ConfigureMCDBPrerequisite -SSDSizeInBytes <> -SSDCountPerServer <>
For more information you could refer to: MetaCacheDatabase (MCDB) setup
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