Normal disks also have a default 128kb readahead, not 4 MB, which seems to be quite sufficient. I don't see why you want the dm device layered on top of the physical disks doing MORE readahead, let alone 4 MB worth. If the setting given to lvchange is not respected though, that is a bug.
-- very sub-optimal default readahead settings on device and unused readahead setting in LVM https://bugs.launchpad.net/bugs/129488 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
