300-610 · Question #204
Refer to the exhibit. A customer runs an Online Transaction Processing (OLTP) application on Server1. The application generates a small number of transactions and requires low storage latency. Server2
The correct answer is D. Configure QoS and scheduler for data traffic on both Fibre Channel switches. The customer needs to ensure consistent low I/O latency for an OLTP server while a backup server experiences high-latency spikes during backups, using existing Fibre Channel hardware.
Question
Refer to the exhibit. A customer runs an Online Transaction Processing (OLTP) application on Server1. The application generates a small number of transactions and requires low storage latency. Server2 is a backup server that performs backups twice a day. During the backup window, the OLTP application experiences high-latency spikes that affect the application performance. The customer must meet these requirements:
- Maintain consistent low I/O latency for the OLTP server.
- Guarantee I/O throughput for the OLTP server during backup time
- Allow the customer to keep the existing hardware.
Which action must be taken to meet these requirements?
Exhibit
Options
- AApply a traffic shaper to the FC Switch 1 interface that is facing the server
- BCreate a SAN port channel between FC Switch! and FC Switch2.
- CAdd another 8G link to the Serverl and create F-Port-channel
- DConfigure QoS and scheduler for data traffic on both Fibre Channel switches
How the community answered
(24 responses)- A13% (3)
- B4% (1)
- C8% (2)
- D75% (18)
Why each option
The customer needs to ensure consistent low I/O latency for an OLTP server while a backup server experiences high-latency spikes during backups, using existing Fibre Channel hardware.
Applying a traffic shaper to the FC Switch 1 interface that is facing the server might limit the backup server's outbound traffic but may not fully guarantee the consistent low latency needed for OLTP, as congestion could still occur elsewhere or upstream.
Creating a SAN port channel between FC Switch1 and FC Switch2 increases bandwidth and redundancy between the switches but does not inherently provide granular I/O prioritization for specific application traffic flows to guarantee OLTP performance.
Adding another 8G link to Server1 and creating an F-Port-channel increases the bandwidth available to Server1, which could improve its performance, but it does not address the core problem of backup traffic contending for resources and causing latency spikes for the OLTP application without explicit QoS.
Concept tested: Fibre Channel QoS for I/O prioritization
Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/5_2/configuration/guides/qos/qos_5_2.html
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