Poor SQL performance with raid10
Check your configuration.  Do SHOW VARIABLES; on each machine, then diff the output.  It smells like one of these is different:
innodb_buffer_pool_size
sync_binlog
innodb_flush_binlog_on_trx_commit
or maybe something else.

Now to be hostile...  RAID-10  (or -5) without a battery-backed-write-cache is hardly worth having.  Sure, you gain recovery from a disk crash (a rare event), but meanwhile, you don't get the write speedup of the write cache.