148 lines
4.6 KiB
Plaintext
148 lines
4.6 KiB
Plaintext
$NetBSD: storage,v 1.8 2009/11/17 21:09:54 agc Exp $
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NetBSD Storage Roadmap
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======================
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This is a small roadmap document, and deals with the storage and file
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systems side of the operating system.
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The following elements and projects are pencilled in for 6.0, but
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please do not rely on them being there.
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Features that will be in 6.0:
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2. logical volume management
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3. a native port of Sun's ZFS
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7. rump extensions
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10. RAIDframe parity map
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Features that are planned for 6.0:
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1. devfs
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4. ReFUSE-lowlevel
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5. web-based management tools for storage subsystems
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6. support for flash devices - NAND and MMC/SD
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8. virtualised disks in userland
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9. in-kernel iSCSI initiator
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We currently expect to branch 6.0 in the March 2010 timeframe, with a view
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to a 6.0 release later in 2010.
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We'll continue to update this roadmap as features and dates get firmed up.
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Some explanations
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=================
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1. devfs
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---------
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Devfs will allow device special files (the files used to access
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devices) to be created dynamically as and when they are attached to
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the system. This will greatly reduce the number of files in a /dev
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directory and removes the need to run the MAKEDEV script when support
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for new devices is added to the NetBSD kernel. NetBSD's devfs
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implementation will also allow multiple instances of the file system
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to be mounted simultaneously, which is very useful for chroot jails.
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Please contact core@ if you are interested in devfs development.
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Responsible: mjf
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2. Logical Volume Management
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----------------------------
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Based on the Linux lvm2 and devmapper software, with a new kernel component
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for NetBSD written. Merged in 5.99.5 sources, will be in 6.0.
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Responsible: haad, martin
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3. Native port of Sun's ZFS
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---------------------------
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Two Summer of Code projects have been held, concentrating on the
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provision of ZFS support for NetBSD. Mostly completed by haad, and
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building on ver's work, this is the port of Sun's ZFS, with
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modifications to make it compile on NetBSD by ad@, and based on the
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Sun code for the block layer. Discussions are still taking place to
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get the design right for support for the openat(2) system call family,
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and the correct architecture for reclaiming vnodes.
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The ZFS source code has been committed to the repository.
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Responsible: haad, ad, ver
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4. ReFUSE-lowlevel
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------------------
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FUSE has two interfaces, the normal high-level one, and a lower-level
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interface which is closer to the way standard file systems operate. This
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adds the low-level functionality in the same way that ReFUSE adds the
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high-level functionality
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Responsible: pooka, agc
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5. Web-based Management tools for Storage Subsystems
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----------------------------------------------------
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Standard tools for managing the storage subsystems that NetBSD provides,
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using a standard web-server as the basic user interface on the storage
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device, allowing remote management by a standard web browser.
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Responsible: agc
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6. Support for flash devices - NAND and MMC/SD
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----------------------------------------------
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The NetBSD Foundation is interested in having a file system which is
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optimised to work with today's flash devices, including SSDs both with
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wear-levelling functionality and without, as well as support for NAND,
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and MMC/SD devices. Please get in touch with core@ if you're interested
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in helping out with this area of development.
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Responsible: TBD
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7. RUMP Extensions
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------------------
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Rump support has been in NetBSD for 2 releases now, and continues to be
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developed actively. Recent additions have included cgd support, and smbfs
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client support.
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Responsible: pooka
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8. Virtualised disks in Userland
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--------------------------------
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For better support of virtualization, a library which provides a consistent
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view of virtualized disk images has been developed by jmcneill.
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Responsible: jmcneill
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9. In-kernel iSCSI Initiator
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----------------------------
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NetBSD has had a userland implementation of an iSCSI initiator since
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NetBSD 4.99.35, based on ReFUSE. There is a possibility that an
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in-kernel initiator may be available - please contact core if you are
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interested in this functionality.
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Responsible: core
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10. RAIDframe parity map
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------------------------
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Jed Davis successfully completed a Summer of Code project to implement
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parity map zones for RAIDframe. Parity mapping drastically reduces
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the amount of time spent rewriting parity after an unclean shutdown by
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keeping better track of which regions might have had outstanding
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writes. Enabled by default; can be disabled on a per-set basis, or
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tuned, with the new raidctl(8) commands.
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Merged in 5.99.22 sources, and will be in 6.0. A separate set of
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patches is available for NetBSD-5.
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Responsible: jld
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Alistair Crooks
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Tue Nov 17 07:17:20 PST 2009
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