Re: raid10 redundancy

Hi Phillip,

On Fri, May 14, 2021 at 10:28:52AM -0400, Phillip Susi wrote:

Andy Smith writes:

quoted

While the *layout* would be identical to RAID-1 in this case, there
is the difference that a single threaded read will come from both
devices with RAID-10, right?

No, since the data is not striped, you would get *worse* performance if
you tried to do that.

Are you absolutely sure about this? Previous posts from Neil and
others seem to contradict you:

    https://www.spinics.net/lists/raid/msg47219.html
    https://www.spinics.net/lists/raid/msg47240.html

and what I have tested and observed in the past backs up the theory
that a single threaded read against a Linux RAID-10 can use n
devices whereas a single-threaded read against Linux RAID-1 will
only use 1 device.

Cheers,
Andy