In a thread in General Hardware viewtopic.php?f=29&t=93996
I started talking about ionice and how it stops hard drive systems from slowing to a crawl. I don't want to derail that topic so starting a new thread here to continue the conversation.
just brew it! wrote: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.
I just checked and whilst there is a bug saying exactly this https://bugs.launchpad.net/ubuntu/+sour ... ug/1310402
, it turns out that my machine is defaulting to the CFQ scheduler
- Code: Select all
$ uname -rv
3.2.0-63-generic #95-Ubuntu SMP Thu May 15 23:05:57 UTC 2014
$ grep DEFAULT_IOSCHED /boot/config-3.2.0-63-generic
just brew it! wrote: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...
Can't help with that