Would running two CP command to copy 2 different set of files to two different targets suffice as a basic two thread test?
So long as you generate disk access through a file system and not hdparm.
Is there a way to monitor actual disk transfers from command line without having to do manual timing?
Like I said: iostat iostat -m 1 iostat -x 1 iostat -d 1 iostat -xm 1 Choose whatever information/data you fancy.In fact, let me just post some iostat output to settle this once and for all. I shall risk the annoyance of all by attaching the output of a 'iostat -m sda sdb md1 1' command.
This was generated by a single Linux client connected via cifs do a cp -r off the cifs remote share to local disk. The output was generated on the remote share box.
From the output, I guess one loses grounds for claiming that md raid1 only reads off one disk even if there are periods of time when it really does only read off one disk.
Attachment:
md_does_multipath.bz2
Description: application/bzip
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