If you want to see your server’s harddisk’s write and read speed,
Install hdparm first;
yum install hdparm
Then you can check the speed of your HDD’s by pointing their locations like;
hdparm -Tt /dev/vda1
The output will be like that:
/dev/vda1: Timing cached reads: 18038 MB in 1.99 seconds = 9052.72 MB/sec Timing buffered disk reads: 5498 MB in 3.00 seconds = 1832.66 MB/sec
That means my /dev/vda1 HDD has the ability to read around 9GB/sec and to write 1.8GB/sec.