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Before performing the procedures outlined in this chapter you must configure access to the SAN following one of the setup guides in the [LVM Overview]({{% relref "overview#san-appliance-setup" %}}) section.
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## SAN Storage
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This storage configuration assumes that Hosts have access to storage devices (LUNs) exported by an
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Storage Area Network (SAN) server using a suitable protocol like iSCSI or Fibre Channel. The Hosts
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will interface the devices through the LVM abstraction layer. Virtual Machines run from an LV
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(logical volume) device instead of plain files. This reduces the overhead of having a filesystem in
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place and thus it may increase I/O performance.
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Disk images are stored in file format in the Image Datastore and then dumped into an LV when a
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Virtual Machine is created. The image files are transferred to the Host through the SSH protocol.
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Additionally, [LVM Thin]({{% relref "#lvm-thin" %}}) can be enabled to support creating thin
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snapshots of the VM disks.
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## SAN Appliance Configuration
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First of all, you need to configure your SAN appliance to export the LUN(s) where VMs will be
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deployed. Depending on the manufacturer the process may be slightly different, so please refer to
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the specific guides if your hardware is on the supported list, or your hardware vendor guides
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otherwise:
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-[NetApp specific guide]({{% relref "/product/cluster_configuration/san_storage/netapp_-_lvm_thin_validation/" %}})
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-[PureStorage specific guide]({{% relref "/product/cluster_configuration/san_storage/purestorage_-_lvm-thin_validation/" %}})
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Also included in the above guides is a specific multipath configuration for both the front-end and virtualization hosts, which recommended over the more general multipath configuration presented below.
This setup assumes you are using NetApp ONTAP with iSCSI and are trying to use it as a backend for one of OpenNebula's [LVM datastore options]({{% relref "." %}}). The configuration uses standard volume and host mappings. If you are familiar with the NetApp ONTAP interface and its functionality, create the required resources as desired.
This setup assumes you are using a PureStorage FlashArray with iSCSI and want to use it as a backend for one of OpenNebula's [LVM datastore options]({{% relref "." %}}). The configuration uses standard volume and host mappings. If you are familiar with the PureStorage interface, create the required resources as desired.
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