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storage revision 1.2.2.1 
      1 $NetBSD: storage,v 1.2.2.1 2009/01/26 05:15:53 snj Exp $
      2 
      3 NetBSD Storage Roadmap
      4 ======================
      5 
      6 This is a small roadmap document, and deals with the storage and file
      7 systems side of the operating system.
      8 
      9 NetBSD 5.0 will ship with the following storage elements in place:
     10 
     11 1. puffs/putter
     12 2. ReFUSE
     13 3. rump
     14 4. RAIDframe
     15 5. iSCSI target
     16 6. iSCSI initiator
     17 7. cgd
     18 8. fss
     19 9. journalling functionality for ffs
     20 10. read/write support for UDF file systems
     21 
     22 The following elements and projects are pencilled in for 6.0, but
     23 please do not rely on them being there.
     24 
     25 11. devfs
     26 12. logical volume management
     27 13. a native port of Sun's ZFS
     28 14. ReFUSE-lowlevel
     29 15. web-based management tools for storage subsystems
     30 16. support for flash devices - NAND and MMC/SD
     31 
     32 The timescales for 6.0 are not known at the present time, but we would
     33 expect to branch 6.0 late in 2009, with a view to a 6.0 release in
     34 early 2010.
     35 
     36 
     37 Some explanations
     38 =================
     39 
     40 11. devfs
     41 ---------
     42 
     43 Devfs will allow device special files (the files used to access
     44 devices) to be created dynamically as and when they are attached to
     45 the system.  This will greatly reduce the number of files in a /dev
     46 directory and removes the need to run the MAKEDEV script when support
     47 for new devices is added to the NetBSD kernel.  NetBSD's devfs
     48 implementation will also allow multiple instances of the file system
     49 to be mounted simultaneously, which is very useful for chroot jails.
     50 
     51 Responsible: mjf
     52 
     53 9. Journalling Functionality for FFS
     54 -------------------------------------
     55 
     56 Contributed by Wasabi Systems, Inc, technical review on tech-kern
     57 in March 2008, merged to HEAD in July 2008, will be in NetBSD 5.0.
     58 
     59 12. Logical Volume Management
     60 -----------------------------
     61 
     62 Based on the Linux lvm2 and devmapper software, with a new kernel component
     63 for NetBSD written. Merged in 5.99.5 sources, will be in 6.0.
     64 
     65 Responsible: haad, martin
     66 
     67 13. Native port of Sun's ZFS
     68 ----------------------------
     69 
     70 Mostly completed by ad@, this is the FreeBSD port of Sun's ZFS, with
     71 modifications to make it compile on NetBSD 5.0 by ad@, and based on
     72 the original Sun code for the block layer, rather than the GEOM-based
     73 layer.
     74 
     75 Responsible: ad, many others
     76 
     77 14. ReFUSE-lowlevel
     78 -------------------
     79 
     80 FUSE has two interfaces, the normal high-level one, and a lower-level
     81 interface which is closer to the way standard file systems operate. This
     82 adds the low-level functionality in the same way that ReFUSE adds the
     83 high-level functionality
     84 
     85 Responsible: pooka, agc
     86 
     87 15. Web-based Management tools for Storage Subsystems
     88 -----------------------------------------------------
     89 
     90 Standard tools for managing the storage subsystems that NetBSD provides,
     91 using a standard web-server as the basic user interface on the storage
     92 device, allowing remote management by a standard web browser.
     93 
     94 Responsible: agc
     95 
     96 
     97 Alistair Crooks
     98 Sun 25 Jan 2009 20:55:12 PST
     99