Kay Diederichs wrote: > BTW, there is - even with current kernels - no speed gain in using > RAID1 - see http://kernelnewbies.org/KernelProjects/Raid1ReadBalancing . except, thats wrong. I unwrapped a recent kernel source tarball from kernel.org and found... static struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector) { struct mirror *m = get_default_mirror(ms); do { if (likely(!atomic_read(&m->error_count))) return m; if (m-- == ms->mirror) m += ms->nr_mirrors; } while (m != get_default_mirror(ms)); return NULL; } so it appears its a round robin ...