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  • 1.  USB hard drive stops responding

    Posted Sep 12, 2013 05:26 PM

    Server: HP ProLiant ML350p Gen8

    ESXi 5.1.0 1157734

    Hard Drives: Seagate RSS Backup+Desk

    VM USB Controller: EHCI+UHCI

    Guest OS: Windows 2008 Server R2 SP1


    Having problem with USB Hard drives. ESXi seems to drop connection to external hard drives. They stop respond in the Windows Server. It's still showing the USB Device in the VM settings. I still see it available and linked to my VM. If I remove it, the status doesn't change when shown in the available devices. At that moment, I can't add or remove any other USB Hard drive to any other VMs. Even if you add an other external hard drive to the server, on any usb port, it won't show up.

    Vms are running fine, but I need the USB hard drive for backup purpose. Problem started since the first backups of the server (New installation, made 2 weeks ago). Running Veeam 6.5 update 3.

    To workaround this problem, I have to reboot the host. Everything is normal until out of a suddent, backup fails saying it can't write to path. I look at the hard drive and it's not responding.

    I get this event repeating every second until I reboot the host:

    URB timed out - USB device may not respond

    (2013-09-12T17:03:24.978Z cpu21:8736)


    2013-09-12 13:03:24


    USB Arbitrator service is running

    USB Keyboard on the host screen is working

    What I tried:

    Updating ESXi

    Updating all HP Firmware

    While the host is online, restarting the won't work either.

    My question is, where do I need to look at. HP or VMWare ? Or USB hard drives ? I don't have another set of 5 external hdd to try..

  • 2.  RE: USB hard drive stops responding

    Posted Sep 13, 2013 11:32 AM


    I have such a problem twice in VMware Workstation.

    Nothing helps, mount unmount...problem exists.

    First time it solved after reinstalling VMware Tools.

    Second time nothing helped, only fresh install of OS :smileysad:

    It is not hardware problem, only software, so you need to look in VMware.

    Hope will help.

    Mar Vista

  • 3.  RE: USB hard drive stops responding

    Posted Sep 13, 2013 11:50 AM

    Just have a look at

    Hope this helps



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