175 lines
5.5 KiB
Plaintext
175 lines
5.5 KiB
Plaintext
$NetBSD: storage,v 1.9 2012/01/14 22:06:16 agc Exp $
|
|
|
|
NetBSD Storage Roadmap
|
|
======================
|
|
|
|
This is a small roadmap document, and deals with the storage and file
|
|
systems side of the operating system.
|
|
|
|
The following elements and projects are pencilled in for 6.0, but
|
|
please do not rely on them being there.
|
|
|
|
Features that will be in 6.0:
|
|
2. logical volume management
|
|
3. a native port of Sun's ZFS
|
|
4. ReFUSE, perfuse and pud
|
|
6. Support for flash devices - NAND, and flash file system
|
|
7. rump extensions
|
|
9. in-kernel iSCSI initiator
|
|
10. RAIDframe parity map
|
|
11. quota system re-work
|
|
|
|
Features that are planned for future releases:
|
|
1. devfs/udevfsd
|
|
5. web-based management tools for storage subsystems
|
|
8. virtualised disks in userland
|
|
12. lfs renovation
|
|
|
|
We'll continue to update this roadmap as features and dates get firmed up.
|
|
|
|
Some explanations
|
|
=================
|
|
|
|
1. udevfsd
|
|
----------
|
|
|
|
There has always been discussion over devfs, and experience with it
|
|
seems mixed (to be kind). At the same time, carrying around a whole
|
|
populated /dev seems quite possible and effective, but maybe a bit
|
|
unwieldy. jmcneill's udevfsd addresses this in a different way, and
|
|
is currently in othersrc/external/bsd/udevfsd. Not planned for 6.0
|
|
right now.
|
|
|
|
Responsible: jmcneill
|
|
|
|
2. Logical Volume Management
|
|
----------------------------
|
|
|
|
Based on the Linux lvm2 and devmapper software, with a new kernel component
|
|
for NetBSD written. Merged in 5.99.5 sources, will be in 6.0.
|
|
|
|
Responsible: haad, martin
|
|
|
|
3. Native port of Sun's ZFS
|
|
---------------------------
|
|
|
|
Two Summer of Code projects have been held, concentrating on the
|
|
provision of ZFS support for NetBSD. Mostly completed by haad, and
|
|
building on ver's work, this is the port of Sun's ZFS, with
|
|
modifications to make it compile on NetBSD by ad@, and based on the
|
|
Sun code for the block layer. Discussions are still taking place to
|
|
get the design right for support for the openat(2) system call family,
|
|
and the correct architecture for reclaiming vnodes.
|
|
|
|
The ZFS source code has been committed to the repository.
|
|
|
|
Responsible: haad, ad, ver
|
|
|
|
4. ReFUSE, perfuse and pud
|
|
--------------------------
|
|
|
|
FUSE has two interfaces, the normal high-level one, and a lower-level
|
|
interface which is closer to the way standard file systems operate.
|
|
manu's perfuse adds the low-level functionality in the same way that
|
|
ReFUSE adds the high-level functionality. In addition, there is the
|
|
"pass to userspace device" framework added by pooka as part of rump.
|
|
All 3 will be in 6.0.
|
|
|
|
Responsible: pooka, manu, agc
|
|
|
|
5. Web-based Management tools for Storage Subsystems
|
|
----------------------------------------------------
|
|
|
|
Standard tools for managing the storage subsystems that NetBSD
|
|
provides, using a standard web-server as the basic user interface on
|
|
the storage device, allowing remote management by a standard web
|
|
browser. CIM and related functinoality are interesting datapoints in
|
|
this space, although credentials and authentication are always
|
|
challenges in this space. Will not make it into 6.0
|
|
|
|
Responsible: agc
|
|
|
|
6. Support for flash devices - NAND, and flash file system
|
|
----------------------------------------------------------
|
|
|
|
ahoka has have contributed many things in this area, including
|
|
flash(4), flash(9), flashctl(8) and nand(9). In addition, the
|
|
University of Szeged has contributed chfs,
|
|
http://en.wikipedia.org/wiki/CHFS, which is described as "the first
|
|
open source flash specific file system written for NetBSD". All of
|
|
these will be in 6.0.
|
|
|
|
Responsible: ahoka
|
|
|
|
7. RUMP Extensions
|
|
------------------
|
|
|
|
Rump support has been in NetBSD for 2 releases now, and continues to be
|
|
developed actively. Recent additions have included cgd support, and smbfs
|
|
client support.
|
|
|
|
Responsible: pooka
|
|
|
|
|
|
8. Virtualised disks in Userland
|
|
--------------------------------
|
|
|
|
For better support of virtualization, a library which provides a consistent
|
|
view of virtualized disk images has been developed by jmcneill. This will
|
|
not make it into 6.0, although some extra functionality for reading vmdk
|
|
images is available in othersrc/external/bsd/vmdk.
|
|
|
|
Responsible: jmcneill, agc
|
|
|
|
|
|
9. In-kernel iSCSI Initiator
|
|
----------------------------
|
|
|
|
NetBSD has had a userland implementation of an iSCSI initiator since
|
|
NetBSD 4.99.35, based on ReFUSE. Wasabi Systems kindly contributed their
|
|
kernel-based iSCSI initiator, and it will be in 6.0.
|
|
|
|
Responsible: riz, agc
|
|
|
|
|
|
10. RAIDframe parity map
|
|
------------------------
|
|
|
|
Jed Davis successfully completed a Summer of Code project to implement
|
|
parity map zones for RAIDframe. Parity mapping drastically reduces
|
|
the amount of time spent rewriting parity after an unclean shutdown by
|
|
keeping better track of which regions might have had outstanding
|
|
writes. Enabled by default; can be disabled on a per-set basis, or
|
|
tuned, with the new raidctl(8) commands.
|
|
|
|
Merged in 5.99.22 sources, and will be in 6.0. A separate set of
|
|
patches is available for NetBSD-5.
|
|
|
|
Responsible: jld
|
|
|
|
|
|
11. quota system re-work
|
|
------------------------
|
|
|
|
The quota system has been re-worked by bouyer, and is in -current
|
|
right now. dholland is updating and modifying this rework so that it
|
|
is a more generalised solution, with better features for security.
|
|
This is expected to be in 6.0, although there is a lot of work to
|
|
complete.
|
|
|
|
Responsible: bouyer, dholland
|
|
|
|
|
|
12. LFS renovation
|
|
------------------
|
|
|
|
LFS had been de-emphasised in the time period leading up to the
|
|
5.0 release, but is undergoing some rework by perseant, and dholland
|
|
has some contributions in this area too.
|
|
|
|
Responsible: perseant, dholland
|
|
|
|
|
|
Alistair Crooks, David Holland
|
|
Sat Jan 14 05:52:37 PST 2012
|