1: # 1. Status of NetBSD zfs port
2:
3: NetBSD zfs port is work in progress and can easily panic your system.
4:
5: **ZFS currently works ony on i386 and amd64!!**
6:
7: ---
8: # 2. Using NetBSD ZFS port
9:
10: ## Instalation
11:
12: Use any -current build from i386 or amd64 architecture. All tools and modules should be built by default, now. There are 2 modules used for ZFS solaris.kmod and zfs.kmod. Solaris module provides solaris like interfaces to zfs on NetBSD. The second module is zfs and provides zfs file system functions.
13:
14: ## Configuration
15:
16: User need to
17:
18: modload solaris
19: modload zfs
20:
21: After loading modules user can create zpool(zfs version of volume manager) and manage zfs file systems on it.
22:
23: zpool create {zpool name} {type} {device}
24:
25: where type is:
26:
27: * mirror
28: * raidz
29: * raidz2
30: * default is normal linear allocation
31:
32: device is blod device on netbsd /dev/sd0a for example.
33:
34: zpool create tank mirror /dev/sd0a /dev/sd1a creates mirrored zpool between 2 disk partitions.
35:
36: With zpool created we can create zfs filesystems or zvols(zfs logical volume disks)
37:
38: zfs create -V {size} tank/{zvol name} creates zvol with {zvol name} from ZPOOL called tank
39:
40: Logical disk is created in
41:
42: /dev/zvol/rdsk/{zpool name}/{zvol name}
43:
44: /dev/zvol/dsk/{zpool name}/{zvol name}
45:
46: zfs create tank/{zfs name} create zfs filesystem on a zpool called tank
47:
48: ## Administration
49:
50: After creating ZVOLS and filesystem they are saved in a /etc/zfs/zpool.cache file and loaded after nextzfs module load.
51:
52: ---
53: # 3. Known Bugs
54:
55: ## Show stoppers
56:
57: ### amd64
58:
59: ### i386
60:
61: ### Both
62: * vnode reclaiming deadlocks
63:
64: Current code is quite a hack but it works until I will find some time to rework vnode reclaiming on NetBSD.
65:
66: http://nxr.netbsd.org/xref/src/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vnops.c#4254
67:
68: * vnode fsync bug
69:
70: I think that we are hitting this bug, too. I have some patches in the tree which fixes deadlod in vnode reclaim but after that I'm getting another deadlock in VOP_FSYNC.
71:
72: * kmem_cache_alloc/ aka pool_cache_get panicsdue to KM_NOSLEEP flag
73: There are some problems in then NEtBSD UVM subsytem when KM_NOSLEEP allocation can fail even if system has enough memory to use. I talked with ad@ about it and he said that there is one problem in uvm where some lock is held, KM_NOSLEEP allocation will fail.
74:
75: ## Functional bugs
76: * Snapshots
77: * Permissions
78: * Old code, we should update NetBSD zfs port to new code
79: * More tasks can be found at <http://nxr.netbsd.org/xref/src/external/cddl/osnet/TODO>
80:
81: # External Documentation links
82: Nice zfs howto written for zfs + mac os x <http://code.google.com/p/maczfs/wiki/GettingStarted>
CVSweb for NetBSD wikisrc <wikimaster@NetBSD.org> software: FreeBSD-CVSweb