It would be great if @lifeless could try attempting to contact dm-devel again. This is a very important patch that would provide large benefit across a variety of systems.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/361733 Title: dmraid(fakeRAID) raid1 driver doesn't loadbalance reads Status in “linux” package in Ubuntu: Confirmed Bug description: This is a kernel bug. Actually, it's intended behavior, but it shouldn't be. In theory, fake RAID and software RAID should be the same thing. The only practical difference is where they get their metadata from. One from the system BIOS, the other from the disk. However, it turns out that they take two completely different code paths. The fakeraid (dmraid) driver reads only from the primary disk, while the software raid (mdraid) driver implements load balancing for RAID1. Of course, this difference isn't well-documented, resulting in people sometimes choosing the wrong one. (1) There's no good reason why there should be two separate software RAID1 drivers. They should be merged. (2) In the meanwhile, people should be splashed with loud warnings that if they choose fakeraid, they'll not get the improved read performance that they expect. Here's the LKML discussion where I asked about this: http://kerneltrap.org/index.php?q=mailarchive/linux-kernel/2008/7/7/2370344/thread As far as I know, they haven't addressed this problem since. I'm reporting this here, because I see Ubuntu as the distro that seems to take responsibility for fixing a lot of the silliness that others won't. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/361733/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
