Areca FAQ System - Q10021903 - Under Centos 6 32-bit Linux 4.4, we get slow write speed. # dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync 1+0 records in 1+0 records out 104857600 bytes (105 MB) copied, 20.3667 s, 5.1 MB/s

Q10021903 - Under Centos 6 32-bit Linux 4.4, we get slow write speed.
# dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync
1+0 records in
1+0 records out
104857600 bytes (105 MB) copied, 20.3667 s, 5.1 MB/s

There seems to be a limitation in the Linux 4.4 kernel (32-bit) which affects disk write speed **if** more than 4GB of RAM is installed. Adding mem=4Gto the kernel boot line increased the disk write speed to 800 MB/s to 1GB/s.

Tags: Centos, Linux

Last update:: 2020-08-25 10:43
Author:: Simone
Revision:: 1.1

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