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My first guess would be "storage". How are disks and volumes configured? Which kind of RAID is in use? I'm pretty sure you have a rebuilding or degraded disk array; that would explain the slowness.


Stack trace ends with megasas that means command to your MegaRAID (you probably have some RAID array) may have unexpectedly failed or it's a driver bug. I'd recommend updating MegaRAID firmware together with ESXi driver (and probably ESXi itself while you're at it). ESXi 5.1 is ancient but you can still get updates and async drivers from VMware site. My gut ...


Make sure Windows Sync Share service starts up as System Account, that worked for me

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