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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