On 2020-04-01 09:14, Roger Heflin wrote: > To have the issue it helps to have the reading disk be a quite a bit > faster than the receiving disk that way the reading disk can easily > get ahead and fill up the write cache faster than the reading disk can > process it (it backs up into the writecache). > > So USB3.0 3.5-7200rpm or an SSD will easily overrun a standard laptop > 5900 rpm 2.5" hard disk. This was not done on a quiet system CPU wise, boinc jobs running. But not much other I/O going on. SDD--->USB-Flash real 16m38.608s user 0m1.416s sys 3m37.379s USB-Flash--->SDD real 6m37.671s user 0m0.662s sys 1m4.984s I then found an old laptop HDD in a USB 2.0 enclosure. Reading from the SDD should be much faster than writing to the HDD. SDD--->HDD real 30m53.407s user 0m0.942s sys 2m46.756s HDD--->SDD real 32m48.615s user 0m0.896s sys 1m9.483s And, for completeness SDD--->SDD real 4m58.406s user 0m0.517s sys 1m8.402s No issues at anytime with stability or slowdown in all cases. -- The key to getting good answers is to ask good questions. _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
