Annotation of wikisrc/users/haad/porting_zfs.mdwn, revision 1.6
1.1 wiki 1: # 1. Status of NetBSD zfs port
2:
3: NetBSD zfs port is work in progress and can easily panic your system.
1.2 wiki 4:
5: **ZFS currently works ony on i386!!**
6:
1.1 wiki 7: ---
8: # 2. Using NetBSD ZFS port
9:
1.2 wiki 10: ## Instalation
1.1 wiki 11:
1.2 wiki 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.
1.1 wiki 13:
14: ## Configuration
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1.2 wiki 16: User need to
17:
1.5 wiki 18: modload solaris
19: modload zfs
1.2 wiki 20:
21: After loading modules user can create zpool(zfs version of volume manager) and manage zfs file systems on it.
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1.5 wiki 23: zpool create {zpool name} {type} {device}
1.2 wiki 24:
1.3 wiki 25: where type is:
26:
27: * mirror
28: * raidz
29: * raidz2
30: * default is normal linear allocation
1.2 wiki 31:
32: device is blod device on netbsd /dev/sd0a for example.
33:
1.5 wiki 34: zpool create tank mirror /dev/sd0a /dev/sd1a creates mirrored zpool between 2 disk partitions.
1.2 wiki 35:
1.3 wiki 36: With zpool created we can create zfs filesystems or zvols(zfs logical volume disks)
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1.5 wiki 38: zfs create -V {size} tank/{zvol name} creates zvol with {zvol name} from ZPOOL called tank
1.3 wiki 39:
40: Logical disk is created in
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1.5 wiki 42: /dev/zvol/rdsk/{zpool name}/{zvol name}
1.4 wiki 43:
1.5 wiki 44: /dev/zvol/dsk/{zpool name}/{zvol name}
1.3 wiki 45:
1.5 wiki 46: zfs create tank/{zfs name} create zfs filesystem on a zpool called tank
1.2 wiki 47:
1.1 wiki 48: ## Administration
49:
1.4 wiki 50: After creating ZVOLS and filesystem they are saved in a /etc/zfs/zpool.cache file and loaded after nextzfs module load.
51:
1.1 wiki 52: ---
53: # 3. Known Bugs
54:
55: ## Show stoppers
56:
57: ### amd64
58: * amd64 zio_root crash
59: Investigation
60: vdev_label_read_config -> zio_root calls zio_wait on a zio_root zio_t. Later zio_execute tries to generate
61: checksum on zio->zio_data which is NULL for a zio_root. Is this ressurrection of andys zio_null problem ?
62: because zio_root is basicaly zio_null.
63:
64: Solution
65: What is difference between i386 and amd64 version why it is working on i386 and not on a amd64 that can be
66: solution.
67: ### i386
68:
69: ### Both
70: * vnode reclaiming deadlocks
71:
72: This can be fixed by deferring call to zfs_zinactive in zfs_reclaim to another system thread if lock is held.
73: But it causes deadlock and we need to investigate if it is caused by this change or by another problem.
74:
75: Deadlock backtrace is this
76:
77: VOP_WRITE->zfs_netbsd_write->zfs_write->dmu_tx_wait->txg_wait_open->cv_wait
78: txq_quisce_thread->txg_thread_wait->cv_wait
79: txg_sync_thread->spa_sync->dsl_pool_sync->zio_wait->cv_wait
80:
81: FreeBSD approach should be investigated why they are doing this differently and why it works for them. They
82: call zfs_zinactive from zfs_freebsd_inactive which is null op for NetBSD.
83:
84: zfs umount panic is caused by using FreeBSD approach in zfs_reclaim.
85:
1.4 wiki 86: * vnode fsync bug
87:
88: 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.
1.1 wiki 89:
90: ## Functional bugs
91: * Snapshots
92: * Permissions
93: * Old code, we should update NetBSD zfs port to new code
1.5 wiki 94: * More tasks can be found at [http://nxr.netbsd.org/xref/src/external/cddl/osnet/TODO]
1.6 ! wiki 95:
! 96: # External Documentation links
! 97: Nice zfs howto written for zfs + mac os x [http://code.google.com/p/maczfs/wiki/GettingStarted]
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