Am trying upstream kernel v4.20-rc4
(2e6e902d185027f8e3cb8b7305238f7e35d6a436).

Not easy for a newbie because your link does not include the order in
which the modules have to be installed. Downloaded the low-latency
(whatever that means) packages and managed to boot the new kernel. It
seems less slow (glacial speeds rather than continental drift speeds). I
realize copying 3TB of data will take some time (two days 4TB to 4TB as
opposed to two months 4TB to 8TB). Am copying just one directory (about
100.9GB from 4TB to 8TB) to see how many days it takes. I am using the
Terminal copy command since Caja is 3x slower.

Cannot yet say if fixed or not - time will tell.

Getting properties on folder in a 4TB drive is much faster than getting
properties of same folder in a 8TB drive - so something is still wonky.

You say "If the mainline kernel does not fix this bug, please add the
tag: 'kernel-bug-exists-upstream'." How? I see buttons to add attachment
but nothing on how to add tag.

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1802821

Title:
  Serious design flaw using large external drives.

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I am trying to recover data from an HFS+ files system on a 4TB
  external USB 3 drive. Copying 3TB from the 4TB HFS+ drive to a 4TB
  NTFS drive using MATE Terminal cp -anR from to took 2 days.

  When I try to copy the same data to a 6TB NTFS USB 3 drive the results
  are glacial. 750GB has taken over 6 days. Obviously there is a problem
  of scale drive in Ubuntu MATE. I invite the developers to plug in a
  12TB drive and see just how glacial (no - not glacial, more on the
  order of plate techtonics) slow their design is.

  Robert Pearson

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-38-generic 4.15.0-38.41
  ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
  Uname: Linux 4.15.0-38-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  robert     2102 F.... pulseaudio
   /dev/snd/controlC0:  robert     2102 F.... pulseaudio
  CurrentDesktop: MATE
  Date: Sun Nov 11 23:50:13 2018
  HibernationDevice: RESUME=UUID=aa95f07d-f769-44ca-8b33-0c5b3c78bdeb
  InstallationDate: Installed on 2018-10-25 (18 days ago)
  InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 
(20180426)
  MachineType: System manufacturer System Product Name
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-38-generic 
root=UUID=26dc3ca5-f3ae-47eb-92b6-4f02ed5ba4f0 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-38-generic N/A
   linux-backports-modules-4.15.0-38-generic  N/A
   linux-firmware                             1.173.1
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1301
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: A88XM-A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1301:bd04/01/2014:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnA88XM-A:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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