No subject

in almost all use cases. But when it comes to stability, it is
absolutely unusable (for me).

For other filesystems - I do not know any competing to that two above
(non-distributed clustered fs on a shared/mirrored block device). You
may look at lustre, GPFS, pvfs, ceph, but they are completely different
(distributed) and wont probably fit your storage design. Also they all
have drawbacks: lustre is available only for el5 (afaik), GPFS is not
free, ceph is still alpha-quality and not recommended for production.

Best,
Vladislav