Public bug reported: If any RAID level is configured, there are some simple and important optimisations which should be done when a file system is created on them. If LVM is used in between, this also needs additional settings.
I am personally not clear on the details - I was out of my depth when reading about all this - but informing the overlying layers of the RAID stripe size seemed crucial. My performance of out-of-the-box ext4 on LVM on 4 disk RAID10 was miserable, and about 25% of what I should have been getting. Partly this was due to blockdev readahead (another bug report). The partitioner should automatically set the chunk/stripe/stride/etc of overlying FS and LVM to match the RAID setup beneath. ** Affects: ubuntu Importance: Undecided Status: New -- partitioner not intelligent with filing system config on top of RAID https://bugs.launchpad.net/bugs/357023 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