300-610 · Question #184
A network architect designs the iSCSI architecture. The requirements are to achieve high performance and a low amount of oversubscription and to minimize latency. Which two actions must be taken to me
The correct answer is A. Configure the size of the payload in each frame to MTU 9000. C. Enable iSCSI port binding on the Initiator device.. To optimize iSCSI for high performance, low oversubscription, and minimal latency, configuring jumbo frames (MTU 9000) and enabling iSCSI port binding on the initiator are crucial.
Question
A network architect designs the iSCSI architecture. The requirements are to achieve high performance and a low amount of oversubscription and to minimize latency. Which two actions must be taken to meet these requirements? (Choose two.)
Options
- AConfigure the size of the payload in each frame to MTU 9000.
- BMinimize the number of hops between the storage and the hosts.
- CEnable iSCSI port binding on the Initiator device.
- DSet the size of the payload in each frame to MTU 1500.
- EUse a software-based iSCSI adapter on the client side.
How the community answered
(28 responses)- A75% (21)
- B4% (1)
- D7% (2)
- E14% (4)
Why each option
To optimize iSCSI for high performance, low oversubscription, and minimal latency, configuring jumbo frames (MTU 9000) and enabling iSCSI port binding on the initiator are crucial.
Configuring the MTU to 9000 (jumbo frames) reduces the number of frames required to transmit data, thereby decreasing CPU overhead on both the initiator and target, reducing interrupt rates, and increasing throughput, which directly contributes to higher performance and lower latency for iSCSI traffic.
Minimizing the number of hops is a general network design principle for reducing latency, but configuring iSCSI-specific features like jumbo frames and port binding are more direct actions to meet the specific iSCSI performance and latency requirements.
iSCSI port binding allows multiple network interfaces on an initiator to present a single iSCSI IP address to the target, enabling multipathing, load balancing, and failover. This increases throughput and resilience, contributing to higher performance and minimizing latency by utilizing available bandwidth effectively.
Setting the MTU to 1500 is the standard Ethernet frame size and does not optimize for high performance; it would result in more frames and higher overhead compared to jumbo frames (MTU 9000).
Using a software-based iSCSI adapter typically offloads iSCSI processing to the host CPU, which can increase CPU utilization and potentially reduce performance compared to a hardware-based iSCSI HBA that offloads this processing.
Concept tested: iSCSI performance optimization (Jumbo Frames, Port Binding)
Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/3_1/b_UCSM_GUI_Configuration_Guide_3_1/b_UCSM_GUI_Configuration_Guide_3_1_chapter_01000.html
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