just brew it! wrote:
like copying a bunch of large files) is occurring. Without a SSD, intensive disk activity can sometimes cause the desktop to become laggy and unresponsive nearly to the point of being unusable. With an SSD this does not happen.
I've found that if I ionice the large copy then the system remains remarkably responsive even though the HDD light is on solid.
Hmm... the documentation implies that ionice requires the CFQ I/O scheduler. Ubuntu uses the deadline scheduler by default, so I assume it would have no effect unless I force use of the CFQ scheduler? (I do know how to configure the I/O scheduler, so that's not a big deal.)
More problematic is that it also sounds like ionice does not work with MD (software RAID) arrays. I typically use software RAID-1 for mechanical HDDs, so ionice may be a non-starter...
If the world isn't making sense to you, you're either drinking too much or not drinking enough.