![]() Key issues that arise with NAS storage include noisy neighbour problems that occur when extremely busy VMs dominate I/O, rogue clients that arise when unauthorised VMs are created, NFS metadata bottlenecks, poor write performance and server and virtual machine latency. Apps are more densely populated on servers and traffic is more bursty.” ![]() There is just more volume of traffic and less predictability. Contrast old batch methods with the tendency to online processing we see now. “And with that, things are becoming more transactional. “More workloads are being virtualised,” said Bahn. Key reasons for NAS storage issues include failing and degrading NAS devices, upgrades that don’t go as planned, and issues – often related to I/O – that are caused by the demands of virtualisation. Storage analysts explain how suppliers spin spec sheet figures. Array makers’ storage performance specs are not always what they seem.We run the rule over storage performance metrics – latency, throughput and IOPS – that are key to optimising virtual machines.Rather than going through this process, IT departments often simply bought more NAS capacity, said Bahn. This uses up staff time and money and results in unpredictable resolution times. “So, we are expanding out monitoring footprint to meet that.”Ĭurrently, users engaged in troubleshooting NAS storage have to capture Ethernet packets and send PCAP data to the array supplier for analysis. “Most mission-critical apps are on Fibre Channel, but there is always some NAS somewhere in the organisation,” he said. Virtual Instruments EMEA marketing director Jim Bahn said the new functionality was in response to customer demand. The UI enables customers to visually depict metrics and see where different issues arise that may be connected. It currently supports NFS version 3, but will support version 4 and the SMB protocol in 2017, plus Ethernet-based SAN protocol iSCSI. The 2U NAS Probe hardware can measure more than 400 metrics and operate at a 10Gbps line rate with 16 concurrent ports. ![]() The NAS Performance Probe provides line-rate NFS monitoring, analysis and correlation across compute, network and storage that combines agentless collection of physical and virtual machine data. This add-on to the VirtualWisdom 5 suite allows customers to monitor and interrogate hundreds of metrics in NFS traffic just as they can already in Fibre Channel fabrics.
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