Re: Adding a USB device to a SATA-only array

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On 15/07/18 20:33, Kevin Lyda wrote:
> On Sun, Jan 7, 2018 at 12:10 PM, Wols Lists <antlists@xxxxxxxxxxxxxxx> wrote:
>> On 07/01/18 10:58, Kevin Lyda wrote:
>>> This scenario sounds great, but last I knew mixing SATA and USB
>>> connected disks would lead to data corruption. But I last looked
>>> around 2010 or so. Is this still true? If not, what version of the
>>> kernel / mdadm tools did it get fixed in. I skimmed the changelogs and
>>> commits and didn't see any mentions that it had been.
>>
>> Speaking off the top of my head, I got the impression that the problem
>> actually lies in the USB protocol. In other words it can't be fixed :-(
> 
> It seems it can be fixed. Are there any plans to move such
> changes into the mainline kernel?
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1557434
> 
I would have thought such changes need to go into the mainline kernel.

HOWEVER

Reading through that bug report, it seems clear to me that this
particular instance of the bug actually lies in the LVM layer.

The implication is that this bug is not *the* problem. I'm guessing
there's more to it, but it would be great if this has identified at
least one of the causes - namely that maximum buffer sizes aren't been
shrunk when required.

Cheers,
Wol
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