On 6/18/2018 10:55 AM, Les Mikesell wrote:
> On Mon, Jun 18, 2018 at 9:38 AM, Bowie Bailey <bowie_bai...@buc.com> wrote:
>> I have another big local backup that's been running all weekend.  I am
>> trying sudo/rsync rather than rsyncd or ssh/rsync this time.  This
>> directory has millions of small files (and is even bigger than the first
>> one), so I expect it to take longer.
>> This time, I'm seeing higher IO-wait numbers:
> Moving the disk head around is almost always the slowest operation and
> on the first full it has to traverse every file.  And backups tend to
> not fit the normal OS caching mechanisms that try to hide that
> slowness.

Right.  I only pointed it out since I did not see this on the previous
backup that ran for 24 hours.  I'm still not sure where the bottleneck
was there since I was never able to see anything that looked busy during
the process.


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