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san - Glossary for NetApp specific SAN terms
The san glossary is meant to provide users with short definitions
and examples of terminology used by NetApp in its
unified storage offering. These terms are a supplement to
the SNIA dictionary at http://www.snia.org/education/dictionary/
which provides a more comprehensive list of SAN
terms.
FCP ( Fibre Channel Protocol )
A licensed service on the filer that enables you to
export LUNs to hosts using the SCSI protocol over a
Fibre Channel fabric.
HBA ( host bus adapter )
An I/O adapter that connects a host I/O bus to a
computer's memory system. HBA is the preferred term
in SCSI contexts. The HBA might be an FCP adapter
or an iSCSI adapter. An adapter might have multiple
ports.
host
A system that is accessing data on a filer as
blocks. The host accesses data using the FCP or
iSCSI protocols.
igroup ( Initiator Group )
A collection of the unique identifiers, either
iSCSI node names or WWPNs of initiators (hosts).
Initiator groups can have multiple initiators, and
multiple initiator groups can have the same initiator.
To make the LUNs accessible to hosts, you use
the lun map command to map LUNs to an initiator
group. By mapping LUNs to the hosts listed in the
initiator group, you allow access to the LUNs to
these hosts. If you do not map a LUN, the LUN is
not accessible to any hosts. The following example
shows an FCP initiator group with two initiators:
igroup_1 (FCP) (ostype: solaris):
10:00:00:00:c7:2c:36:3e
10:00:00:00:c8:2c:37:g1
Initiator
The system component that originates an I/O command
over an I/O bus or network.
iSCSI
A licensed service on the filer that enables you to
export LUNs to hosts using the SCSI protocol over
TCP/IP.
LUN ( logical unit number )
The SCSI identifier of a logical unit within a target.
LUN clone
A complete copy of a LUN, which was initially created
to be backed by a LUN or a file in a snapshot.
The clone creates a complete copy of the LUN and
frees the snapshot, which can then be deleted. For
more information, see the lun create -b command on
the man page for na_lun.
-
LUN ID
-
The ID that the filer exports for a given LUN. The
LUN ID is mapped to an initiator group to enable
host access. For a Windows system LUN 0 must exist
so that the host will recognize additional LUNs.
The following example shows a LUN with an ID of 6:
LUN path Mapped to LUN ID
---------------------------------------------------
/vol/vol10/fcpdb.lun igroup_1 6
LUN path
The path to a LUN on the filer. The following example
shows a LUN path:
LUN path Mapped to LUN ID
---------------------------------------------------
/vol/vol10/fcpdb.lun igroup_1 6
LUN serial
The unique serial number for a LUN as defined by
the filer. You use the lun serial command to change
this number. The following example shows a LUN
serial number:
filer_1> lun show -v /vol/vol0/fcpdb
/vol/vol0/fcpdb 10m (10485760) (r/w, online)
Serial#: Och/RngAi4p4
Share: none
Space Reservation: enabled
Multiprotocol Type: image
map
To create an association between a LUN and an initiator
group. A LUN mapped to an initiator group is
exported to the nodes in the initiator group (WWNN
or iqn) when the LUN is online. LUN maps are used
to secure access relationships between LUNs and the
host.
online
Signifies that a LUN is exported to its mapped
initiator groups. A LUN can be online only if it is
enabled for read/write access.
offline
Disables the export of the LUN to its mapped initiator
groups. The LUN is not available to hosts.
share
Allows the LUN's data be accessible through multiple
file protocols such as NFS and FCP. One can
share a LUN for read or write access, or all permissions.
- SPACE_RESERVATIONS
-
Required for guaranteed space availability for a
given LUN with or without snapshots.
target
The system component that receives a SCSI I/O command.
WWN ( World Wide Number )
A unique 48 or 64-bit number assigned by a recognized
naming authority (often through block assignment
to a manufacturer) that identifies a connection
to the storage network. A WWN is assigned for
the life of a connection (device).
WWNN ( World Wide Node Name )
Every node has a unique World Wide Node Name
(WWNN), which Data ONTAP refers to as a Fibre Channel
Nodename, or, simply, node name. NetApp assigns
a WWNN to a filer based on the serial number of its
NVRAM. The WWNN is stored on disk. The WWNN is a
64-bit address represented in the following format:
nn:nn:nn:nn:nn:nn:nn:nn, where n represents a hexadecimal
value.
WWPN ( World Wide Port Name )
Each Fibre Channel device has one or more ports
that are used to connect it to the SAN network.
Each port has a unique World Wide Port Name (WWPN),
which Data ONTAP refers to as an FC Portname, or,
simply, port name. The WWPN is a 64-bit address
represented in the following format:
nn:nn:nn:nn:nn:nn:nn:nn, where n represents a hexadecimal
value.
na_fcp(1), na_igroup(1), na_iscsi(1), na_lun(1)
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