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
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partitioner not intelligent with filing system config on top of RAID
https://bugs.launchpad.net/bugs/357023
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