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Storage discovery

Storage discovery

Discovery collects information on Direct Attached Storage (DAS), Storage Area Networks (SAN), and Network Attached Storage (NAS).

Storage can be located on specialized devices, such as Storage Arrays, Fibre Channel Switches, iSCSI disks, or on host operating systems, including Windows, Linux, and Solaris.

Discovery finds and maps dependencies for the following types of storage:
  • Direct-attached storage (DAS), network-attached storage (NAS), or storage area network (SAN).
  • NAS or SAN storage that is discovered via a Storage Management Initiative Specification (SMI-S) and Common Information Model (CIM).
  • Virtual storage for VMware EXS servers and Linux Kernel-based Virtual Machines (KVM). Discovery maps this storage to the underlying physical storage.

Discovery of storage via a host reconciles data and creates relationships between the host's file systems and associated local storage devices. The local storage devices represent the storage available to the host, whether it's directly attached or provided by Fibre Channel or iSCSI. This reconciliation assumes that the storage server has been discovered first.

Discovery collects and creates CIs in the CMDB for the following information:
  • File systems (local and NAS).
  • Disks (both SAN disks and DAS drives).
  • Fibre Channel (FC) HBAs and ports.
  • Linux Volume Manager (LVM) volumes. LVM volume data resides in the Storage Pool [cmdb_ci_storage_pool] table.
  • Veritas Volume Manager disks, subdisks, disk groups, plexes, and volumes.
Note: For details about the discovery of direct attached or multipath block storage provisioned on a Linux host, see KB0622583.

Probes, sensors, and patterns

  • KVM - Storage Pools: identifies storage attached to KVM virtual machines.
  • Linux - Storage: identifies storage attached to systems running the Linux operating system.
  • Solaris - Storage: identifies storage attached to systems running the Solaris operating system.
  • Windows - Storage 2008: identifies storage attached to systems running Windows 2008.
    • Windows - Storage 2008 - PS: identifies storage attached to systems running Windows 2008, using the PowerShell.
    • Windows - Storage 2008 - WMI: identifies storage attached to systems running Windows 2008, using WMI Runner.
  • Windows - Storage 2012: identifies storage attached to systems running Windows 2012 and later.
    • Windows - Storage 2012 - PS: identifies storage attached to Windows systems, using PowerShell.
    • Windows - Storage 2012 - WMI: identifies storage attached to Windows systems, using WMI Runner.
  • VMWare - vCenter ESX Hosts Storage: collects information about ESX servers and creates relationships from datastores to underlying disks.
  • Patterns for NetApp storage discovery:
    • NetApp 7-mode: finds NetApp servers via REST with two nodes.
    • NetApp cluster mode: finds NetApp servers via REST when more than two nodes are connected through a cluster interconnect switch.
    Warning: DO NOT switch from probes to patterns if you are already running Discovery with probes, and your CMDB is already populated. If you do so, it is possible that the pattern Discovery process does not synchronize on the same values that the probe Discovery process does. This could result in duplicate CIs in your CMDB.

Requirements

Windows
  • For Windows, use one of the following supported host configurations:
    • Windows Server 2012, DAS or NAS with Fibre Channel (FC) or Internet Small Computer System Interface (iSCSI).
    • Windows Server 2008, DAS or NAS with FC or iSCSI.
  • Install the fcinfo.exe tool on Windows 2008 and 2012 servers that attach to storage via FC.
  • Install Windows Management Instrumentation (WMI).
  • Enable Powershell on the MID Server host server.
  • Provide the instance with the necessary credentials to the host server.
  • Put the MID Server and the target machine in the same domain or add the target machine to the trusted host list on the MID Server machine.
  • Optionally, install Windows Remote Management (WinRM) on the host server to discover Fibre Channel information. WinRM is on by default for Windows 2012 and Windows 2016 machines, but not for Windows 2008.
Linux
  • For Linux, use one of the following supported host configurations:
    • Solaris, DAS, NAS, or SAN with iSCSI
    • CentOS, DAS, NAS, or SAN with FC or iSCSI
    • Ubuntu Server, DAS, NAS, or SAN with iSCSI
  • Provide the device with SSH credentials that have root or sudo access.
  • Provide the MID Server with the necessary credentials to the host server.

Relationships

Discovery creates the following relationships for storage CIs:
Parent Component Relationship Child Component
Storage Export [cmdb_ci_storage_export] Exports to::Imports from Storage Device [cmdb_ci_storage_device]
Fibre Channel Disk [cmdb_ci_fc_disk] Provides::Provided by File System [cmdb_ci_file_system]
iSCSI Disk [cmdb_ci_iscsi_disk] Provides::Provided by File System [cmdb_ci_file_system]
NAS File System [cmdb_ci_nas_file_system] Allocated from::Allocated to Storage File Share [cmdb_ci_storage_fileshare]