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m_bertram
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Contributor

USB write performance issue in guest os

Hypervisor: ESXi 5.5

Guest OS: Windows 2008 r2, but seems not be relevant

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After upgrading some esxi 5.1 hosts to 5.5 i have noticed that write performance to an attached usb-massstorage (RDX, but also USB-HDD) is worse ... now only about 10GB per hour.

Does anyone else experienced this? Nobody out there using RDX as backup device in a Win2k8r2 VM? Searched a lot the web but not successful...  apart from it's not really supported by VMWare.

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the red arrow shows the disk-write activity to the usb device (graphic from process explorer in the guest-os / vm) ... always cuts at 32MB, staggered, no continuous stream .... can someone explain this? have seen this on several independent systems...

thanks in advance, M.Bertram

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