The Exchange Server writes its data and also creating new items like email to the transaction log files before committing them to the information stores. So each of the mailbox database modification/paging will be written to a memory cache, and after a time duration, the Exchange server will commit the cache contents into the related information stores (of course operation like application-aware backups will do it too). Then we could say for better performance of the Exchange server, SSD disks that is used as a flash-based datastore for keeping the only dedicated VMDK for the storing of transaction logs will be a good best practice.
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