On [Fri, 13.04.2007 12:06], Anders Breindahl wrote:
AB> On 200704101607, Michael Loftis wrote:
AB> > RAID-5 is extremely slow at writes. Also can't forget about seeks.
AB> > Depending on your access patterns an external journal can be a definite
AB> > win, sometimes it's always a win with certain access patterns. EXT3 also
AB> > by default only journals metadata, not data, which means the write rate to
AB> > the journal is relatively low.
AB>
AB> Allow me to correct:
AB>
AB> Ext3 journals both data and metadata. Xfs only journals metadata. But
AB> that might be a relevant issue here, too, as many seem to prefer xfs on
AB> their mail servers.
no, that's not correct. ext3 can do both, jounral only metadata or
metadata+data, although i don't know what's the default.