12/18/2023 0 Comments Aws scsi disk map to xvd![]() ESXi supports several types of iSCSI adapters.įor information on configuring and using iSCSI adapters, see Configuring iSCSI and iSER Adapters and Storage with ESXi. In the ESXi environment, iSCSI adapters configured on your host play the role of initiators. The iSCSI initiator originates communication between your host and an external iSCSI storage system and sends data to the storage system. The initiator is a software or hardware installed on your ESXi host. To access iSCSI targets, your ESXi host uses iSCSI initiators. The remaining 40 bits are assigned by the entity holding that company ID and must be unique. The top 24 bits are a company ID that IEEE registers with a particular company. The 16-hexadecimal digits are text representations of a 64-bit number of an IEEE EUI (extended unique identifier) format. The Enterprise Unique Identifier (EUI) format takes the form The naming authority must make sure that any names assigned following the colon are unique, such as: unique name is any name you want to use, for example, the name of your host.The name indicates that the domain name was registered in January of 1998, and iscsi is a subdomain, maintained by. For example, the naming authority can have the iSCSI qualified name form of .iscsi. ![]() naming-authority is the reverse syntax of the Internet domain name of the naming authority.yyyy-mm is the year and month when the naming authority was established.The iSCSI Qualified Name (IQN) format takes the form The most common is the IQN format.įor more details on iSCSI naming requirements and string profiles, see RFC 3721 and RFC 3722 on the IETF website. ISCSI names are formatted in two different ways. ISCSI uses a special unique name to identify an iSCSI node, either target or initiator. iSCSI ports are end-points of an iSCSI session. iSCSI aliases are not unique and are intended to be a friendly name to associate with a port.Įach node has one or more ports that connect it to the SAN. Usually, you do not have to change the default value, but if you do, make sure that the new iSCSI name you enter is worldwide unique.Ī more manageable name for an iSCSI device or port used instead of the iSCSI name. iSCSI uses the iSCSI Qualified Name (IQN) and Extended Unique Identifier (EUI).ĮSXi generates unique iSCSI names for your iSCSI initiators, for example, This address is like the IP address that you assign to your computer to get access to your company's network or the Internet.Ī worldwide unique name for identifying the node. IP AddressĮach iSCSI node can have an IP address associated with it so that routing and switching equipment on your network can establish the connection between the host and storage. ESXi uses several methods to identify a node. Nodes and Ports in the iSCSI SANĪ single discoverable entity on the iSCSI SAN, such as an initiator or a target, represents an iSCSI node.Įach node has a node name. The process of detecting a failed path and switching to another is called path failover.įor more information on multipathing, see Understanding Multipathing and Failover in the ESXi Environment. If any component of the path fails, the host selects another available path for I/O. Generally, a single path from a host to a LUN consists of an iSCSI adapter or NIC, switch ports, connecting cables, and the storage controller port. With multipathing, your ESXi host can have more than one physical path to a LUN on a storage system. When transferring data between the host server and storage, the SAN uses a technique known as multipathing. The iSCSI target responds to the initiator's commands by transmitting required iSCSI data. The target can also be a virtual iSCSI SAN, for example, an iSCSI target emulator running in a virtual machine. Typically, the iSCSI target represents a physical storage system on the network. It initiates iSCSI sessions by issuing SCSI commands and transmitting them, encapsulated into the iSCSI protocol, to an iSCSI server. The client, called iSCSI initiator, operates on your ESXi host. ![]() The iSCSI SAN uses a client-server architecture. The iSCSI network also includes switches and routers that transport the storage traffic, cables, storage processors (SPs), and storage disk systems. On the host side, the iSCSI SAN components include iSCSI host bus adapters (HBAs) or Network Interface Cards (NICs). ISCSI SAN uses Ethernet connections between hosts and high-performance storage subsystems. With the iSER protocol, the host can use the same iSCSI framework, but replaces the TCP/IP transport with the Remote Direct Memory Access (RDMA) transport. ![]() In addition to traditional iSCSI, ESXi also supports iSCSI Extensions for RDMA (iSER). ESXi can connect to external SAN storage using the Internet SCSI (iSCSI) protocol. ![]()
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