On 05/20/2015 01:09 PM, Bryn Hughes wrote:

> What do you call it when multiple backup jobs are writing to disk 
> storage while at the same time a copy job is reading from that same disk 
> subsystem and writing to tape?

I call the comparison FUD because compare that to multiple backup jobs
writing to tape at the same time while a copy job is reading from the
same tape.

> ... You will be hard pressed to sustain more than 30-40 
> MB/sec with even just 2-3 streams running on a single consumer hard 
> drive.  More streams (concurrent backup jobs) will reduce throughput 
> further.  This isn't FUD, this is REALITY.

My reality is 340MB/s with 10 clients spooling to consumer ssd and 1
write job despooling to consumer spinning rust. You may be hard pressed
to do 1/10th of that in your reality but nobody else has to live there.

-- 
Dimitri Maziuk
Programmer/sysadmin
BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu

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