That's a pretty big zip file for mc to deal with, it's considerably slower than using bare unzip. Other than that IDK.
Sent from my Motorola XT1527 On Sat, Jun 23, 2018, 9:28 AM David Pottage <da...@electric-spoon.com> wrote: > Is it a new SSD that has not been used before? Did you start copying > data shortly after powering it on for the first time? > > I saw similar behavior with an SD card a few years ago, and came up with > a theory that when new the SSD controller needs to test all the flash to > build up a bad blocks map, but most this is not done in the factory, > only when the device is powered for the first time. > > So when you first plug in a flash device, only a few megabytes are > actually available for writing, and the controller is busy running self > test routines on the rest. Any writes to the untested parts of the flash > get queued behind the testing so will be quite slow. Most users would > not notice an effect, especially with SD cards in digital cameras > because they are powered all the time and only filled gradually. > > Of course this is all just a theory with no real evidence to back it up > other than a cynical view of flash drive manufacturers cost cutting, but > as a work around I now make a point of plugging in a new drive and > leaving it to sit powered but not otherwise in use for a few hours > before I start copying large amounts of data. > > -- > David Pottage > > On 23/06/18 13:39, Gene Heskett wrote: > > I have a usb-3 to sata adapter with a 60GB ssd attached plugged into one > > of the usb-2 ports of a raspi 3b. I just moved a 150 megabyte zip file > > containing the 750 megabyte sources for an rt kernel to it, got decent > > speed doing the copy. > > > > ssh'd into the pi, I asked mc to uppack it, took several minutes. When mc > > finally displayed the root dir of the data in the zip, I set it to the > > task of copying it to the ssd. The speed slowly decayed and after > > around 700k has been copied, the speed is now just over 112 bytes a > > second, with an ETA of nearly 2000 hours. Well into August to complete > > at this rate. > > > > Does anyone have a clue where the blockage for data might be? This is > > from that drive, to that drive. htop is showing perhaps 1 megabyte of > > swap being used. ???????? > > > > Thanks everybody. > > > > Cheers, Gene Heskett > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author) > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > >
