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Re: VMs on external storage CPU overloading



On 7/30/2020 5:19 PM, Dan Ritter wrote:
john doe wrote:
On 7/30/2020 4:41 PM, Dan Ritter wrote:
Two things:

- your CPU load, depending on how you measure it, may include
    processes which are waiting for I/O. This I/O is very slow,
    so.

- not all USB3 devices are the same. Many implement a
    single-request system, where the kernel is only allowed to
    make a read or write call, then wait for the response, then
    issue the next call. Anything describing itself as a "key"
    is particularly likely to have this.


Is there any way to verify this (command wize)?

$ usb-devices

will show

  Driver=usb-storage


Yep, I've got this one, a slow device.

for a slow device, and

  Driver=uas

for a fast device.

Can you change your external storage?

Any suggestion?

You're looking for a device that has UASP support rather than
just USB Mass Storage. Some vendors make it easier to search
for this than others, e.g.

https://www.startech.com/HDD/Enclosures/?filter_UASP_YN=Yes

will show you all the StarTech USB3 enclosures that do UASP.

I don't have any specific recommendations.


Awsome, thanks again dsr.

--
John Doe


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