Hello,
I recently upgraded to the buster-backports kernel (5.5.17). After this
upgrade I needed to prepare an external HDD (WD Elements 2TB) for
encryption and so I used the "write zeroes to a plain crypto container"
approach:
# cryptsetup open --type plain -d /dev/urandom /dev/sde1 to_be_wiped
# dd if=/dev/zero of=/dev/mapper/to_be_wiped bs=64K status=progress
I verified that the container was properly aligned. I had drastically
different results on the 5.5 kernel versus the buster 4.19 kernel:
* On the 4.19 kernel, I was getting throughput between 30MB/sec and
50MB/sec. The operation completed successfully.
* On the 5.5 kernel, I was getting throughput between 10MB/sec and
20MB/sec. At apparently random points, dd would stop reporting any
progress and a "usb-storage" process in top would be consuming 100% CPU.
Any commands against the HDD (even smartctl) would hang until the
device was physically replugged.
Since everything seems to work fine on 4.19 I do not suspect any issues
with the drive itself. It seems there is some problem with the 5.5
kernel? What can I do to further troubleshoot this?
---------- lsusb ----------
Bus 005 Device 002: ID 8087:8000 Intel Corp.
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 003: ID 1058:25a2 Western Digital Technologies, Inc.
Elements 25A2
Bus 004 Device 002: ID 1058:25a2 Western Digital Technologies, Inc.
Elements 25A2
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 004: ID 1058:1042 Western Digital Technologies, Inc.
Elements SE Portable (WDBPCK)
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
---------------------------
The device in question is device 2 on bus 4.
Buster kernel uname:
Linux liz 4.19.0-9-amd64 #1 SMP Debian 4.19.118-2 (2020-04-29) x86_64
GNU/Linux
Buster-backports kernel uname:
Linux liz 5.5.0-0.bpo.2-amd64 #1 SMP Debian 5.5.17-1~bpo10+1
(2020-04-23) x86_64 GNU/Linux
--
Chris Howie
http://www.chrishowie.com
http://en.wikipedia.org/wiki/User:Crazycomputers
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