----------------eredeti üzenet-----------------
Feladó: "Alexandre" alxg...@gmail.com
Címzett: "PongráczI"
CC: "aoetools-discuss lists.sourceforge.net"
aoetools-discuss@lists.sourceforge.net
Dátum: Sat, 6 Apr 2013 10:57:22 +0100
----------------------------------------------------------
>
>
>
>
>
>
>Oh are you talking about iSCSI Digest?
>
>If so I recommend you read this (only the the chapter should be enough to
>shced a ligth):
>
>[http://www.jdsu.com/ProductLiterature/Understanding-iSCSI-Digests-white-
>paper-30162803.pdf ->
>http://www.jdsu.com/ProductLiterature/Understanding-iSCSI-Digests-white-p
>aper-30162803.pdf]
>
>
>To make the long story short, iSCSI digest is meant to protect against errors
>during
>protocol transitions on the hosts, which are highly used in iscsi
>([data]/iSCSI-> TCP -> IP ->
>Ethernet) while aoe only uses ethernet as a carrier so is far less prone to
>this kind of error.
>
>
>Moreover, the overhead introduced by digest seems to have lead people to
>disable it in
>most cases (most initiators disable it by default, and the document states
>that it is known
>to be a common practice in the iscsi world). Instead, integrity is ensured by
>Etherne qnd
>IP checksums (whle AoE only needs to check the Ethernet CRC).
>
>
>If you're talking about another mechanism please let us know.
>
>
>
>
>
>Alexandre, thank you for your valuable answer! Good to know, iscsi in practice
>has a
>good protection, which commonly disabled, great :)
>
>So, as I checked the Layer2, it has error checking as you wrote. So, as I
>understand now,
>data corruption cannot happen on layer2, because this basic CRC protection
>handle layer 1
>issues which can happen in the physical layer.
>
>István
------------------------------------------------------------------------------
Minimize network downtime and maximize team effectiveness.
Reduce network management and security costs.Learn how to hire
the most talented Cisco Certified professionals. Visit the
Employer Resources Portal
http://www.cisco.com/web/learning/employer_resources/index.html
_______________________________________________
Aoetools-discuss mailing list
Aoetools-discuss@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/aoetools-discuss
