storage revision 1.5
1 1.5 agc $NetBSD: storage,v 1.5 2009/09/15 21:07:58 agc Exp $ 2 1.1 agc 3 1.1 agc NetBSD Storage Roadmap 4 1.1 agc ====================== 5 1.1 agc 6 1.1 agc This is a small roadmap document, and deals with the storage and file 7 1.1 agc systems side of the operating system. 8 1.1 agc 9 1.3 agc The following elements and projects are pencilled in for 6.0, but 10 1.1 agc please do not rely on them being there. 11 1.1 agc 12 1.5 agc 1. devfs 13 1.5 agc 2. logical volume management 14 1.5 agc 3. a native port of Sun's ZFS 15 1.5 agc 4. ReFUSE-lowlevel 16 1.5 agc 5. web-based management tools for storage subsystems 17 1.5 agc 6. support for flash devices - NAND and MMC/SD 18 1.5 agc 7. rump extensions 19 1.5 agc 8. virtualised disks in userland 20 1.5 agc 9. in-kernel iSCSI initiator 21 1.5 agc 22 1.5 agc We currently expect to branch 6.0 in the March 2010 timeframe, with a view 23 1.5 agc to a 6.0 release later in 2010. 24 1.1 agc 25 1.4 agc We'll continue to update this roadmap as features and dates get firmed up. 26 1.1 agc 27 1.1 agc Some explanations 28 1.1 agc ================= 29 1.1 agc 30 1.5 agc 1. devfs 31 1.1 agc --------- 32 1.1 agc 33 1.1 agc Devfs will allow device special files (the files used to access 34 1.1 agc devices) to be created dynamically as and when they are attached to 35 1.1 agc the system. This will greatly reduce the number of files in a /dev 36 1.1 agc directory and removes the need to run the MAKEDEV script when support 37 1.1 agc for new devices is added to the NetBSD kernel. NetBSD's devfs 38 1.1 agc implementation will also allow multiple instances of the file system 39 1.1 agc to be mounted simultaneously, which is very useful for chroot jails. 40 1.5 agc Please contact core@ if you are interested in devfs development. 41 1.1 agc 42 1.1 agc Responsible: mjf 43 1.1 agc 44 1.5 agc 2. Logical Volume Management 45 1.5 agc ---------------------------- 46 1.1 agc 47 1.1 agc Based on the Linux lvm2 and devmapper software, with a new kernel component 48 1.3 agc for NetBSD written. Merged in 5.99.5 sources, will be in 6.0. 49 1.1 agc 50 1.1 agc Responsible: haad, martin 51 1.1 agc 52 1.5 agc 3. Native port of Sun's ZFS 53 1.5 agc --------------------------- 54 1.5 agc 55 1.5 agc Two Summer of Code projects have been held, concentrating on the 56 1.5 agc provision of ZFS support for NetBSD. Mostly completed by haad, and 57 1.5 agc building on ver's work, this is the port of Sun's ZFS, with 58 1.5 agc modifications to make it compile on NetBSD by ad@, and based on the 59 1.5 agc Sun code for the block layer. Discussions are still taking place to 60 1.5 agc get the design right for support for the openat(2) system call family, 61 1.5 agc and the correct architecture for reclaiming vnodes. 62 1.1 agc 63 1.5 agc The ZFS source code has been committed to the repository. 64 1.1 agc 65 1.5 agc Responsible: haad, ad, ver 66 1.1 agc 67 1.5 agc 4. ReFUSE-lowlevel 68 1.5 agc ------------------ 69 1.1 agc 70 1.1 agc FUSE has two interfaces, the normal high-level one, and a lower-level 71 1.1 agc interface which is closer to the way standard file systems operate. This 72 1.1 agc adds the low-level functionality in the same way that ReFUSE adds the 73 1.1 agc high-level functionality 74 1.1 agc 75 1.1 agc Responsible: pooka, agc 76 1.1 agc 77 1.5 agc 5. Web-based Management tools for Storage Subsystems 78 1.5 agc ---------------------------------------------------- 79 1.1 agc 80 1.1 agc Standard tools for managing the storage subsystems that NetBSD provides, 81 1.1 agc using a standard web-server as the basic user interface on the storage 82 1.1 agc device, allowing remote management by a standard web browser. 83 1.1 agc 84 1.1 agc Responsible: agc 85 1.1 agc 86 1.5 agc 6. Support for flash devices - NAND and MMC/SD 87 1.5 agc ---------------------------------------------- 88 1.5 agc 89 1.5 agc The NetBSD Foundation is interested in having a file system which is 90 1.5 agc optimised to work with today's flash devices, including SSDs both with 91 1.5 agc wear-levelling functionality and without, as well as support for NAND, 92 1.5 agc and MMC/SD devices. Please get in touch with core@ if you're interested 93 1.5 agc in helping out with this area of development. 94 1.5 agc 95 1.5 agc Responsible: TBD 96 1.5 agc 97 1.5 agc 7. RUMP Extensions 98 1.5 agc ------------------ 99 1.5 agc 100 1.5 agc Rump support has been in NetBSD for 2 releases now, and continues to be 101 1.5 agc developed actively. Recent additions have included cgd support, and smbfs 102 1.5 agc client support. 103 1.5 agc 104 1.5 agc Responsible: pooka 105 1.5 agc 106 1.5 agc 8. Virtualised disks in Userland 107 1.5 agc -------------------------------- 108 1.5 agc 109 1.5 agc For better support of virtualization, a library which provides a consistent 110 1.5 agc view of virtualized disk images has been developed by jmcneill. 111 1.5 agc 112 1.5 agc Responsible: jmcneill 113 1.5 agc 114 1.5 agc 9. In-kernel iSCSI Initiator 115 1.5 agc ---------------------------- 116 1.5 agc 117 1.5 agc NetBSD has had a userland implementation of an iSCSI initiator since 118 1.5 agc NetBSD 4.99.35, based on ReFUSE. There is a possibility that an 119 1.5 agc in-kernel initiator may be available - please contact core if you are 120 1.5 agc interested in this functionality. 121 1.5 agc 122 1.5 agc Responsible: core 123 1.5 agc 124 1.1 agc 125 1.1 agc Alistair Crooks 126 1.5 agc Tue 15 Sep 2009 08:44:14 PDT 127
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