storage revision 1.8
1 $NetBSD: storage,v 1.8 2009/11/17 21:09:54 agc 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 The following elements and projects are pencilled in for 6.0, but 10 please do not rely on them being there. 11 12 Features that will be in 6.0: 13 2. logical volume management 14 3. a native port of Sun's ZFS 15 7. rump extensions 16 10. RAIDframe parity map 17 18 Features that are planned for 6.0: 19 1. devfs 20 4. ReFUSE-lowlevel 21 5. web-based management tools for storage subsystems 22 6. support for flash devices - NAND and MMC/SD 23 8. virtualised disks in userland 24 9. in-kernel iSCSI initiator 25 26 We currently expect to branch 6.0 in the March 2010 timeframe, with a view 27 to a 6.0 release later in 2010. 28 29 We'll continue to update this roadmap as features and dates get firmed up. 30 31 Some explanations 32 ================= 33 34 1. devfs 35 --------- 36 37 Devfs will allow device special files (the files used to access 38 devices) to be created dynamically as and when they are attached to 39 the system. This will greatly reduce the number of files in a /dev 40 directory and removes the need to run the MAKEDEV script when support 41 for new devices is added to the NetBSD kernel. NetBSD's devfs 42 implementation will also allow multiple instances of the file system 43 to be mounted simultaneously, which is very useful for chroot jails. 44 Please contact core@ if you are interested in devfs development. 45 46 Responsible: mjf 47 48 2. Logical Volume Management 49 ---------------------------- 50 51 Based on the Linux lvm2 and devmapper software, with a new kernel component 52 for NetBSD written. Merged in 5.99.5 sources, will be in 6.0. 53 54 Responsible: haad, martin 55 56 3. Native port of Sun's ZFS 57 --------------------------- 58 59 Two Summer of Code projects have been held, concentrating on the 60 provision of ZFS support for NetBSD. Mostly completed by haad, and 61 building on ver's work, this is the port of Sun's ZFS, with 62 modifications to make it compile on NetBSD by ad@, and based on the 63 Sun code for the block layer. Discussions are still taking place to 64 get the design right for support for the openat(2) system call family, 65 and the correct architecture for reclaiming vnodes. 66 67 The ZFS source code has been committed to the repository. 68 69 Responsible: haad, ad, ver 70 71 4. ReFUSE-lowlevel 72 ------------------ 73 74 FUSE has two interfaces, the normal high-level one, and a lower-level 75 interface which is closer to the way standard file systems operate. This 76 adds the low-level functionality in the same way that ReFUSE adds the 77 high-level functionality 78 79 Responsible: pooka, agc 80 81 5. Web-based Management tools for Storage Subsystems 82 ---------------------------------------------------- 83 84 Standard tools for managing the storage subsystems that NetBSD provides, 85 using a standard web-server as the basic user interface on the storage 86 device, allowing remote management by a standard web browser. 87 88 Responsible: agc 89 90 6. Support for flash devices - NAND and MMC/SD 91 ---------------------------------------------- 92 93 The NetBSD Foundation is interested in having a file system which is 94 optimised to work with today's flash devices, including SSDs both with 95 wear-levelling functionality and without, as well as support for NAND, 96 and MMC/SD devices. Please get in touch with core@ if you're interested 97 in helping out with this area of development. 98 99 Responsible: TBD 100 101 7. RUMP Extensions 102 ------------------ 103 104 Rump support has been in NetBSD for 2 releases now, and continues to be 105 developed actively. Recent additions have included cgd support, and smbfs 106 client support. 107 108 Responsible: pooka 109 110 111 8. Virtualised disks in Userland 112 -------------------------------- 113 114 For better support of virtualization, a library which provides a consistent 115 view of virtualized disk images has been developed by jmcneill. 116 117 Responsible: jmcneill 118 119 120 9. In-kernel iSCSI Initiator 121 ---------------------------- 122 123 NetBSD has had a userland implementation of an iSCSI initiator since 124 NetBSD 4.99.35, based on ReFUSE. There is a possibility that an 125 in-kernel initiator may be available - please contact core if you are 126 interested in this functionality. 127 128 Responsible: core 129 130 131 10. RAIDframe parity map 132 ------------------------ 133 134 Jed Davis successfully completed a Summer of Code project to implement 135 parity map zones for RAIDframe. Parity mapping drastically reduces 136 the amount of time spent rewriting parity after an unclean shutdown by 137 keeping better track of which regions might have had outstanding 138 writes. Enabled by default; can be disabled on a per-set basis, or 139 tuned, with the new raidctl(8) commands. 140 141 Merged in 5.99.22 sources, and will be in 6.0. A separate set of 142 patches is available for NetBSD-5. 143 144 Responsible: jld 145 146 Alistair Crooks 147 Tue Nov 17 07:17:20 PST 2009 148
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