I was trying to do some seriuos work, connected with migrating data to new server machine, which has four 73GB SCSI drives spinning up to 15000 rpm. The best performance for me should offer raid10, and as my test shown I was right. LVM over mdadm (software raid) device was a pretty good idea for better management of free space.
And so the story begun :)... as a result few days ago commited a bug in gentoo:
it appears in PLD/centos too. I have no ideas of reason, or problem connected with this. Maybe you have some? Or you found sth like this:
raid10_make_request bug: can't convert block across chunks or bigger than 256k