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Data errors on sata drives in [...]

by
CalTek.Net, Kenneth Wyrick
- 03/10/2020 20:32:01

Data errors on sata drives in NEWER USB3 thumb drives, usb cradles and usb external drive units using "enhanced speed" "enhanced performance"  USB 2(3?) featuring UASP  (USB Attached SCSI Protocol) under libvirt/virt-manager as a raw storage device.
UASP does it's own caching, presumably confusing the qemu emulator  connection.
make the following change   
Under the VIRTUAL DISK tab:
Performance options:
Cache mode: directsync
IO mode:        threads
other setting "hypervisor default"
this may? negatively effect ssd and flash devices, but seems to clear up miswrites.