[Bug 357023] Re: partitioner not intelligent with filing system config on top of RAID

[Phillip Susi]

*** This bug is a duplicate of bug 311179 ***
    https://bugs.launchpad.net/bugs/311179

** This bug is no longer a duplicate of bug 560748
   Installer hides the master device for dmraid 10 (1+0) configurations
** This bug has been marked a duplicate of bug 311179
   libparted hides fakeraid raid10 disks

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Title:
  partitioner not intelligent with filing system config on top of RAID

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  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.

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