![]() To verify this, you can use use DiskPart or Clear-Disk. ![]() Make sure that all SSDs are completely empty, unformatted, and not write-protected. RAW SSD drives are installed with the same SSD count and size for each server in the DAG. The following prerequisites are required for successful configuration and use of MCDB:įor more information, see the following topics:Ĭonfigure AutoReseed for a database availability group The SSDs you use should qualify for "mixed use" and support one drive write per day (DWPD) or greater in terms of write endurance. For example, if your server contains 100 TB of HDD capacity for mailbox databases, an allocation of 5 TB to 6 TB for SSD capacity is enough. Providing 5% to 6% of SSD capacity relative to total HDD capacity is sufficient for on-premises deployments. In order to avoid having to reduce the number of HDDs in the server, consider using M.2 form factor SSDs. Therefore, deploy one SSD for every three HDDs. It is recommended to target a 1:3 ratio between SSD and HDD devices per server. The Manage-MCDB cmdlet will only work with devices exposed as MediaType SSD by Windows. A symmetrical configuration between servers is required, which means there needs to be an identical number of SSDs in each server, and the SSDs all need to be the same size. SSD guidanceĪll SSDs used for MCDB need to be of the same capacity and type. You use this script to configure MCDB prerequisites on a properly configured DAG, to enable or disable MCDB, and to configure and repair MCDB on your servers. To make the Manage-MCDB CMDLet available in your Exchange Management Shell session, do the following: cd $exscripts Manage-MetaCacheDatabase.ps1 is an automation script created for Exchange Server administrators to set up and manage MCDB instances in their Exchange 2019 DAGs.Īfter installing Exchange Server 2019, you can find Manage-MetaCacheDatabase.ps1 here: drive:\Program Files\Microsoft\Exchange Server\V15\Scripts. It allows a database availability group (DAG) to be accelerated by utilizing solid state disks (SSDs). The MetaCacheDatabase (MCDB) feature is included in Exchange Server 2019.
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