Slow performance with Samsung T5 SSD
CJKohler opened this issue · 1 comments
I'm running the Ubuntu 18.04 image on a Pi 4 with 4 GB or RAM. I added a USB SSD (Samsung Portable SSD T5) and changed cmdline.txt to boot from the SSD. That is working, but when I run the speedtests, I get a score of only ~2900.
This is the output from lsusb:
Bus 001 Device 005: ID 04e8:61f5 Samsung Electronics Co., Ltd
And when I check with df -h, I see the ~500 GB partition mounted as root:
ubuntu@cjkohler-pi21:~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 459G 16G 424G 4% /
devtmpfs 1.8G 0 1.8G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 584K 1.9G 1% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 253M 42M 211M 17% /boot/firmware
tmpfs 381M 0 381M 0% /run/user/1000
Here is what blkid shows, I wonder if the fact that the labels and PARTUUID are the same between the SD and the SSD is causing a problem:
ubuntu@cjkohler-pi21:~$ blkid
/dev/mmcblk0p1: LABEL="system-boot" UUID="85F3-CC2B" TYPE="vfat" PARTUUID="da84cd12-01"
/dev/mmcblk0p2: LABEL="writable" UUID="b96d647f-679e-4582-87d0-2d8c7afc91f4" TYPE="ext4" PARTUUID="da84cd12-02"
/dev/sda1: LABEL="system-boot" UUID="85F3-CC2B" TYPE="vfat" PARTUUID="da84cd12-01"
/dev/sda2: LABEL="writable" UUID="b96d647f-679e-4582-87d0-2d8c7afc91f4" TYPE="ext4" PARTUUID="da84cd12-02"
Any idea why the speedtest is giving such a low score?
Thanks
update: I just realized the SSD was plugged into the USB 2 port, not the blue USB 3.1 port After I plugged it into the USB 3.1 port, I got ~7400
https://storage.jamesachambers.com/benchmark/24876