Darren Reed wrote: > So I spent some time thinking about different directions you could build > on this in the future, for example: > 1) controlling the size of the ARC/L2ARC by controlling the cache size > 2) specifying different backing storage for primary/secondary cache > 3) having more than two levels of cache > ...none of which is precluded by current efforts. > > With (2), if the backing storage for each cache is different and it is > slower > to access the secondary cache than the primary, then you may not want > metadata to be stored in the secondary cache for performance reasons. > > As an example, you might be using NVRAM (be it flash or otherwise) > for the primary cache and ordinary RAM for the secondary. In this case > you probably don't want any metadata to be stored in the secondary > cache (power failure issues) but the same may not hold for user data. > But I'm probably wrong about that.
I doubt you would be, the primarycache is system memory not a cache device. The secondarycache is the L2ARC devices specified with the "cache" vdev type to zpool so your examle would be the otherway around. -- Darren J Moffat _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
