Month: August 2015

potentially-poor-vsphere-nfs-read-io-performance-with-10gbe-vmnics

VMware released a knowledge base article about a real performance issue when using NFS with certain 10GbE network adapters in the VMware ESXi host. In vSphere 6.0, NFS Read I/O performance (in IO/s) for large I/O sizes (of 64KB and above) with an NFS datastore may exhibit significant variations. This issue is observed when certain …

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traditional-data-center-storage-systems-are-moved-to-the-cloud

Larry Dignan wrote a great article about the current situation of traditional data center storage systems and the likely future in the cloud. The storage industry already feels, that there is a change ongoing and the customers starting to be hesitant moving forward the tradtional way: "We saw customers become more conservative around refreshing their …

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speed-up-vm-whats-new-in-vmware-vsphere-6

VMware released an official technical guide about What’s New in VMware vSphere 6 also covering some performance improvements and how to speed up VMs. The good news – many performance improvements happen automatically You can find the document here:  What’s New in the VMware vSphere® 6.0 Platform Photo courtesy of Elsie esq.(CC Attribution) NUMA To …

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luns-attached-to-vmware-vsphere-6-0-may-remain-in-apd-timeout-state

Magnus Andersson mentioned in his blog a pretty important VMware bug including the corresponding KB article. When an APD event occurs, LUNs connected to ESXi may remain inaccessible after paths to the LUNs recover. The 140-second APD timeout expires even though paths to storage have recovered. You see the following events in sequence in the /var/log/vmkernel.log: …

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