Raspberry PI Cluster - SD Cards

gistfile1.txt

https://linuxconfig.org/how-to-test-sd-card-speed-on-raspberry-pi

dd if=/dev/zero of=./TestingFile bs=100M count=10 oflag=direct

dd if=./TestingFile of=/dev/zero bs=100M count=10 oflag=dsync

Round One:

RPi 1: Write: 18.7 MB/s Read: 45.6 MB/s
RPi 2: Write:  6.7 MB/s Read: 45.8 MB/s
RPi 3: Write: 12.0 MB/s Read: 45.2 MB/s
RPi 4: Write: 29.5 MB/s Read: 45.7 MB/s

Round Two:

RPi 1: Write: 20.5 MB/s Read: 45.7 MB/s
RPi 2: Write:  7.3 MB/s Read: 45.5 MB/s
RPi 3: Write: 11.6 MB/s Read: 45.3 MB/s
RPi 4: Write: 33.0 MB/s Read: 45.8 MB/s

Round Three:

RPi 1: Write: 23.6 MB/s Read: 45.7 MB/s
RPi 2: Write:  6.9 MB/s Read: 45.7 MB/s
RPi 3: Write: 13.5 MB/s Read: 45.5 MB/s
RPi 4: Write: 36.7 MB/s Read: 45.9 MB/s

Cards:

RPi1: SanDisk SD128 8.5 2021 Oct card classes: 10 switch, 8 application specific, 4 block write, 2 block read, 0 basic, (SanDisk Ultra microSDXC)
RPi2: SanDisk SD128 8.5 2021 Oct card classes: 10 switch, 8 application specific, 4 block write, 2 block read, 0 basic, (SanDisk Ultra microSDXC)
RPi3: SanDisk SD128 8.5 2021 Oct card classes: 10 switch, 8 application specific, 4 block write, 2 block read, 0 basic, (SanDisk Ultra microSDXC)
RPi4: SanDisk SD128 8.6 2023 Mar card classes: 9 I/O mode, 8 application specific, 4 block write, 2 block read, 1 reserved, 0 basic, (SanDisk Extreme microSDXC)

With new sd-cards in RPi 2 & RPi 3:

RPi 2: Write: 36.1 MB/s Read: 45.7 MB/s
RPi 3: Write: 36.6 MB/s Read: 45.7 MB/s

SanDisk SR128 8.6 2023 sep card classes: 9 I/O mode, 8 application specific, 4 block write, 2 block read, 1 reserved, 0 basic,
SanDisk SR128 8.6 2023 sep card classes: 9 I/O mode, 8 application specific, 4 block write, 2 block read, 1 reserved, 0 basic,