Low Read Speed when trying to read a large files through VMFS tools

[harshjay04]

Hi,

First I want to appreciate the team who developed this tool, it helps us a lot in our environment, the issue i am facing is related to the read speeds i am getting when I am trying to copy a large file from VMFS datastore through VMFS-tools , it is giving me 20 Mb read speed i don't know whether this is maximum capability of the tool are i will be able to fine tune some settings to get a better speed.

VMS Datastore(Flash)--->VMFS-tools(Mount as read only dir)----> copy to another Flash Directory local to Linux OS

Need some expert advice

[thinrope]

Try to bypass the VFS layer, accessing directly the block device.
Assuming your VMS Datastore is /dev/sdx1 the easiest is with pv:
pv -petrab /dev/sdx1 >/"another Flash Directory local to Linux OS"/test.dd
Let it run for a few minutes and see your transfer speed. Then delete the test.dd file.

FUSE is not usually a very fast solution, BTW.