Le 25 septembre 2008 à 16:31, Miguel Sousa Filipe a écrit: > On Thu, Sep 25, 2008 at 2:10 PM, Chris Mason <chris.mason@xxxxxxxxxx> wrote: > > I don't plan on adding support for non-persistent storage, but there > > will be the idea of a fast frontend device that is basically a cache for > > slower devices. > > Something like yet another caching/buffer layer between the buffer > cache and the storage devices? > > I recall reading something similiar to that in a listing of new > features of a recent revision of ZFS ? Reminds me WAFL from netapp. http://media.netapp.com/documents/wp_3002.pdf Transactions are written to NVRAM, then flushed every 10 seconds. If some files are created then imediately deleted, it won't even touch the disk. As the server "knows" the underlining RAID structure, it is able to choose how to flush the data for maximum disk throughput. I am not a specialist, but this document is worth reading IMHO. -- Xavier Nicollet http://nicollet.jeru.org/ -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
