[CentOS] USB disk IO

Tue Aug 14 15:50:11 UTC 2018
Jonathan Billings <billings at negate.org>

On Tue, Aug 14, 2018 at 08:53:08AM -0400, Jerry Geis wrote:
> Hello - frequently I turn on my external USB 3.0 disk and back. While my
> machine is copying and backing up my desktop becomes very sluggish.
> Is there a way to change that ? I am using CentOS 7.5 x86 with a very nice
> processor extra cores available and plenty of memory. There is no reason
> the "other" cores cannot keep the desktop going.

Are you performing the backup as your user during the same login
session?  Or is it a separate process/separate login that's doing the

It's possible that the I/O elevator is balancing your backup session
with the I/O of the backup, making any disk activity by your login
session an equal priority (i.e. competing for resources).

You could always use ionice to make your backup process use idle

Jonathan Billings <billings at negate.org>