D-Link DSN-6210 User Manual - Page 105

Difference, Trunking and LACP

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D-Link Document - User Manual Difference MC/S is implemented on iSCSI level, while MPIO is implemented on the higher level. Hence, all MPIO infrastructures are shared among all SCSI transports, SAS, etc. MPIO is the most common usage across all OS vendors. The primary difference between these two is the degree at which level the redundancy is maintained. MPIO creates multiple iSCSI sessions with the target storage. Load balance and failover occurs between the multiple sessions. MC/S creates multiple connections within a single iSCSI session to manage load balance and failover. Notice that iSCSI connections and sessions are different than TCP/IP connections and sessions. The above figures describe the difference between MPIO and MC/S. Here are some considerations for when a user chooses MC/S or MPIO for multi-path. 1. If the user uses hardware iSCSI off-load HBA, then MPIO is the only choice. 2. If the user needs to specify different load balance policies for different LUNs, then MPIO should be used. 3. If the user installs anyone of Windows XP, Windows Vista or Windows 7, then MC/S is the only option since Microsoft MPIO is supported in Windows Server editions only. 4. MC/S can provide higher throughput than MPIO in a Windows system, but it consumes more CPU resources than MPIO. Trunking and LACP Link aggregation is the technique of taking several distinct Ethernet links and making them appear as a single link. It has a larger bandwidth and provides the fault tolerance ability. Beside the Copyright@2014 D-Link System, Inc. All Rights Reserved. 105

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D-Link Document – User Manual
Difference
MC/S is implemented on iSCSI level, while MPIO is implemented on the higher level. Hence, all
MPIO infrastructures are shared among all SCSI transports, SAS, etc. MPIO is the most common
usage across all OS vendors. The primary difference between these two is the degree at which
level the redundancy is maintained.
MPIO creates multiple iSCSI sessions with the target storage.
Load balance and failover occurs between the multiple sessions.
MC/S creates multiple
connections within a single iSCSI session to manage load balance and failover. Notice that iSCSI
connections and sessions are different than TCP/IP connections and sessions. The above figures
describe the difference between MPIO and MC/S.
Here are some considerations for when a user chooses MC/S or MPIO for multi-path.
1.
If the user uses hardware iSCSI off-load HBA, then MPIO is the only choice.
2.
If the user needs to specify different load balance policies for different LUNs, then MPIO
should be used.
3.
If the user installs anyone of Windows XP, Windows Vista or Windows 7, then MC/S is the
only option since Microsoft MPIO is supported in Windows Server editions only.
4.
MC/S can provide higher throughput than MPIO in a Windows system, but it consumes more
CPU resources than MPIO.
Trunking and LACP
Link aggregation is the technique of taking several distinct Ethernet links and making them appear
as a single link. It has a larger bandwidth and provides the fault tolerance ability. Beside the
105
Copyright@2014 D-Link System, Inc. All Rights Reserved.