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Data Domain Virtual Edition (DDVE) running on Microsoft Azure requires the following storage to work (note details may change in later DDOS versions): One 250 GiB Standard HDD or Premium SSD root disk, for the DDVE and DDOS operating system One 10 GiB Standard HDD or Premium SSD NVRAM disk As many as necessary 1 TiB or 2 TiB Standard HDD or Premium SSD for local backup metadata However, when looking into the DDVE storage details from the CLI or the UI, users may notice the presence of an additional disk which is not the operating system, the NVRAM, or any of the local metadata disks they have added. For example: Disk Slot Manufacturer/Model Firmware Serial No. Capacity Type (pci/idx) ---- --------- ------------------------ -------- ---------- --------- ---- dev1 2:0 Msft Virtual_Disk n/a (unknown) 250.0 GiB SAS <<-- OS disk dev2 3:0 Msft Virtual_Disk n/a (unknown) 600.0 GiB SAS <<-- Azure disk dev3 1:0 Msft Virtual_Disk n/a (unknown) 10.0 GiB SAS <<-- NVRAM disk dev4 1:1 Msft Virtual_Disk n/a (unknown) 1.0 TiB SAS <<-- Metadata disk #1 dev5 1:2 Msft Virtual_Disk n/a (unknown) 1.0 TiB SAS <<-- Metadata disk #2 dev6 1:3 Msft Virtual_Disk n/a (unknown) 1.0 TiB SAS <<-- Metadata disk #3 ---- --------- ------------------------ -------- ---------- --------- ---- In the above instance, the DDVE does not use the 600.0 GiB disk. It is not for the operating system, the NVRAM, or storage for local metadata backups.
Azure adds this disk when creating a new VM. For most of the VM types, Azure has on offer, including the VM types used when deploying DDVE from the marketplace. For example, for DDOS 7.11, if creating a DDVE with up to 96 TiB storage capacity, a "Standard_D16ds_v5" type of Azure VM is used for deployment. Details of storage requirements are found in the " Dell PowerProtect DDVE in the Azure Cloud 7.11 Installation and Administration Guide . " Shown below for reference is the table from the guide which outlines the VM resources: Figure 1: Table showing required VM resources from the Administration Guide The Azure documentation for the VM type used is found below. A screenshot of the relevant information is also added for reference: Microsoft Ddv5 and Ddsv5-series documentation Figure 2: Azure VM details As shown in the table above, for the VM type used for installing DDVE, Azure adds a "Temp storage (SSD)" of 600 GiB to the DDVE VM, even if DDVE does not have any use for it. The Microsoft Azure documentation describing this temporary disk is linked and quoted below: Introduction to Azure managed disks From the Microsoft Azure documentation: Temporary disk Most VMs contain a temporary disk, which is not a managed disk. The temporary disk provides short-term storage for applications and processes, and is intended to only store data such as page files, swap files, or SQL Server tempdb. Data on the temporary disk may be lost during a maintenance event or when you redeploy a VM. During a successful standard reboot of the VM, data on the temporary disk will persist. For more information about VMs without temporary disks, see Azure VM sizes with no local temporary disk.
There is no action required on the Data Domain DDVE side. The additional disk can be ignored. It is not being used by DDOS at all. The disk is added as an integral part of the Azure VM type used by DDVE, and should not be modified, altered, or deleted. The Microsoft Azure cloud provider does this itself and hence, if there are doubts, we recommend contacting Microsoft Azure support for more details.
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