Differences between version 3 and previous revision of iSCSI.
Other diffs: Previous Major Revision, Previous Author, or view the Annotated Edit History
| Newer page: | version 3 | Last edited on Sunday, September 11, 2005 9:14:07 am | by AristotlePagaltzis | Revert |
| Older page: | version 2 | Last edited on Friday, July 29, 2005 11:41:34 am | by CraigBox | Revert |
@@ -1,13 +1,15 @@
-[Acronym] for InterNet [SCSI]. iSCSI is a method of encapsulating SCSI over [TCP]/[IP]. It is defined in RFC:3720,
+[Acronym] for InterNet [SCSI].
-An end user will send
a request
for some data. The OperatingSystem will generate
SCSI commands and a data request, which are then encapsulated and encrypted by the iSCSI driver (the ''initiator'')
. A packet header
is added and the IP packets are transmitted over
the [Ethernet
].
+[iSCSI] is
a [TCP/IP] [Protocol]
for encapsulating [
SCSI]
commands. It
is defined in RFC:3720. This allows making block devices available on
the network, accessed as if they were mounted locally. It also means only one host can mount an
[iSCSI
] device at a time, unless the FileSystem is read-only
.
-An iSCSI device receives the packet, decrypts and disassembles it, separating the SCSI commands and request. The SCSI commands are sent through the SCSI controller to the SCSI device (the ''target''). Data will be retreived and returned in the same fashion
.
+Contrast [NAS]
.
-Unlike
[NAS],
iSCSI makes block devices available via the network. You access the disc as if it was mounted locally, and can use any FileSystem of your choice. However,
because it is being handled as a block device, only one system
can use the iSCSI device at a time. To get around this you will need to use a global
or read-only FileSystem
.
+[iSCSI] has gained popularity over ~FibreChannel over [IP] (FCIP)
because it can run over standard [Ethernet] (
or any other) networks
.
-iSCSI has gained popularity over FibreChannel over
IP (FCIP
) because it can run over standard Ethernet networks
.
+[
iSCSI] is generally implemented in a driver (the ''initiator'') that takes [SCSI] commands generated by the OperatingSystem, encapsulates and encrypts them, adds a packet header and trasmits them as [
IP] packets. The [iSCSI] device receives the packets, decrypts and disassembles them, and separates the [SCSI] commands and request. The [SCSI] commands are sent through the [SCSI] controller to the [SCSI] device
(the ''target''
).
+
+The return trip works analogously
.
See also:
* WikiPedia:ISCSI
