Management

How do I determine the disk I/O speed of a node in the Junos Space fabric?

By Elevate posted 03-14-2016 15:41

  

Question

How do I determine the disk I/O speed of a node in the Junos Space fabric?

Answer

You can determine the disk I/O speed of a node in the Junos Space fabric by logging in to the node as an admin user and executing the following command:

 

dd if=/dev/zero of=./test bs=8k count=500000

where test is the name of the file to which the command output is copied.

 

The following is the command output:

500000+0 records in
500000+0 records out
4096000000 bytes (4.1 GB) copied, 15.944 seconds, 257 MB/s

where 257 MB/s indicates the I/O speed of the disk.

 

We recommend that you delete the test file after determining the I/O speed.

 

Note: The minimum disk I/O speed recommended for Junos Space Virtual Appliance is 200 Mbps.

 

For more information about Junos Space Appliances and Junos Space Virtual Appliances, click Junos Space and Applications.


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Comments

04-14-2020 10:04

Thanks for the great information about the dd command, one note though; you mentioned the minimum disk I/O speed recommended for Junos Space Virtual Appliance is 200 Mbps; that is bits per second which is equal to (200 Mbps / 8 bits) = 25 MBps, is this intended or did you mean the minimum is 200 MBps?

 

Also is the theme for Junos Space disk access sequential or random, as this reflect the bandwidth needed?