LogFS: A new way of thinking about flash filesystems
Storage manufacturers are getting ready to start shipping solid state disks, and Linux-based devices like One Laptop per Child's XO and Intel's Classmate don't contain standard hard disks. To improve performance on the wide array of flash memory storage devices now available, project leader Jërn Engel has announced LogFS, a scalable filesystem specifically for flash devices.
Linux users already have two mature flash filesystems to choose from -- JFFS2 and YAFFS -- so why do they need another? Engel discounts both of these options, for different reasons. Engel says that YAFFS "has never made a serious attempt of kernel integration, which may disqualify it" for many potential users. At the same time, Engel says that memory consumption and mount time for JFFS2 are unacceptable on larger flash devices. "Unlike most filesystems, there is no tree structure of any sorts on the medium, so the complete medium needs to be scanned at mount time and a tree structure kept in-memory while the filesystem is mounted. With bigger devices, both mount time and memory consumption increase linearly."
How much storage can LogFS support? Engel says he's not sure. "Honestly, I don't know. All important data structures are 64-bit, so it is possible to work with exabyte devices as soon as they become available. Whether LogFS will really scale that far remains to be proven, though."
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