Volume group

In the Ultra Transcenders books

NCP-MCI-7.5

Each book explains Volume group in context, with comparison tables and the common traps.

Terms in this definition

• RELATED

  Fetches a column value from the lookup table, that is the one side of a many-to-one relationship, for whichever row is being evaluated. It therefore needs to run inside an iterator or a calculated column, where row context exists.

• Virtual machines

  Infrastructure-as-a-service compute giving complete control of the operating system, making it a fit for lift-and-shift moves and for software relying on OS-level pieces like COM.

• CONNECT

  In SQL Server, the right to open a connection to a database. Fabric's equivalent is Read permission on an item, which allows connecting to a warehouse or SQL endpoint but not querying anything in it.

• iSCSI

  Protocol that carries block storage over TCP on port 3260. When recovering files, Azure Backup's script mounts recovery point disks as local volumes using it.

Related terms

• Flash mode

  Favours SSD for a chosen VM, volume group or vDisk, which keeps data that is sensitive to latency out of cold storage. No hot tier space is reserved, and the ceiling is 25 percent of the SSD tier.

• GPFS

  Several clients or directly attached VMs can share a Nutanix volume group at once through this supported IBM product.

• NQN

  Names an NVMe client. Attaching one over NVMeoF/TCP to a volume group means giving Prism Central this identifier.

• NVMeoF/TCP

  Gives one external NVMe client access to a volume group across TCP, configured in Prism Central. It carries much tighter restrictions than iSCSI access and is unavailable where network segmentation is in use.

• Oracle RAC

  A clustered database from Oracle. According to Nutanix, several iSCSI initiators or directly attached VMs can use one volume group for it at once.

• Recovery point

  Prism Element says VM snapshot; Prism Central uses this term for the point-in-time image a protection policy captures from a protected VM or volume group and sends to the recovery AZ.

• snapshot

  Captures a volume group or VM as it was at one moment, by hand or by schedule, for testing and disaster recovery. Restoring either overwrites the original or clones a fresh VM.

• Storage policy encryption

  Encrypting a VM or volume group by means of a storage policy. There is no going back: it stays on after being enabled.