Using SDs for caching?

Roy Sigurd Karlsbakk
2009-06-18T13:56:23Z

Hi all

I have heard/read about systems from Sun and NetApp using SDs for =20
caching. Sun uses different SDs for read and write caching (one being =20
faster for reads and the other for writes). The storage solution from =20
Sun is based on Solaris with ZFS.

I know too little about filesystems design to know exactly how they do =
=20
this, but can someone think of a way this could be implemented in =20
btrfs? I would think such a cache level could speed up things rather =20
well.

Best regards