Hello,
I'm debugging a Faulted raidz1 on zfs-fuse.This is dev pool, created from
loop devices and files. The way I broke is first to degrade pool by
removing a device from it. After that do some transactions. ie copy file.
Stop zfs and reattach the removed device and remove another one. After
restart this is what i get:
pool: tank
state: FAULTED
status: One or more devices could not be used because the label is missing
or invalid. There are insufficient replicas for the pool to
continue
functioning.
action: Destroy and re-create the pool from
a backup source.
see: http://www.sun.com/msg/ZFS-8000-5E
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
tank FAULTED 0 0 0 corrupted data
raidz1-0 ONLINE 0 0 0
loop1 ONLINE 0 0 0
loop2 UNAVAIL 0 0 0 corrupted data
loop3 ONLINE 0 0 0
Question is since raidz1-0 is in ONLINE state, should be able to restore
data?
There should be enough copies from raid to continue fuctioning.
I'm interested in opening pool in some emergency mode to be able to see
what is recoverable.
The code that fails is zap_lookup in dsl_pool_open
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1,
&dp->dp_root_dir_obj);
returns EIO(5)
Thanks for any ideas. Currently I'm thinking to locate a older uberblock
and try with it.
I'm thinking that should work as a snapshot. Am I right?
Another option would be to play with txg parameter in dsl_pool_open
Stack trace:
dbuf_hold_impl(dn = 0x7ffff7e8c9f0, level = 0 \000, blkid = 0, fail_sparse
= 0, tag = 0x510a30 <__func__.12754>, dbp = 0x7fffef1a07b0)
dbuf_hold(dn = 0x7ffff7e8c9f0, blkid = 0, tag = 0x510a30 <__func__.12754>)
dnode_hold_impl(os = 0x7ffff7f81c40, object = 1, flag = 1, tag = 0x50d8ba
<__func__.13943>, dnp = 0x7fffef1a0950)
dnode_hold(os = 0x7ffff7f81c40, object = 1, tag = 0x50d8ba
<__func__.13943>, dnp = 0x7fffef1a0950)
dmu_buf_hold(os = 0x7ffff7f81c40, object = 1, offset = 0, tag = 0x0, dbp =
0x7fffef1a0a10)
zap_lockdir(os = 0x7ffff7f81c40, obj = 1, tx = 0x0, lti = 0, fatreader =
B_TRUE, adding = B_FALSE, zapp = 0x7fffef1a0ab0)
zap_lookup_norm(os = 0x7ffff7f81c40, zapobj = 1, name = 0x514393
"root_dataset", integer_size = 8, num_integers = 1, buf = 0x7ffff7f83968,
mt = MT_EXACT, realname = 0x0, rn_len = 0, ncp = 0x0)
zap_lookup(os = 0x7ffff7f81c40, zapobj = 1, name = 0x514393 "root_dataset",
integer_size = 8, num_integers = 1, buf = 0x7ffff7f83968)
dsl_pool_open(spa = 0x7ffff7f9a000, txg = 128, dpp = 0x7ffff7f9a210)
spa_load_impl(spa = 0x7ffff7f9a000, pool_guid = 9993829304951742789, config
= 0x7ffff7fc0f40, state = SPA_LOAD_OPEN, type = SPA_IMPORT_EXISTING,
mosconfig = B_FALSE, ereport = 0x7fffef1a0ca8)
spa_load(spa = 0x7ffff7f9a000, state = SPA_LOAD_OPEN, type =
SPA_IMPORT_EXISTING, mosconfig = B_FALSE)
spa_load_best(spa = 0x7ffff7f9a000, state = SPA_LOAD_OPEN, mosconfig = 0,
max_request = 18446744073709551615, rewind_flags = 1)
spa_open_common(pool = 0x7ffff7ea7000 "tank", spapp = 0x7fffef1a0dd0, tag =
0x51a5a6 <__func__.14627>, nvpolicy = 0x0, config = 0x7fffef1a0e00)
spa_get_stats(name = 0x7ffff7ea7000 "tank", config = 0x7fffef1a0e00,
altroot = 0x7ffff7ea8000 "", buflen = 8192)
zfs_ioc_pool_stats(zc = 0x7ffff7ea7000)
zfsdev_ioctl(dev = 0, cmd = 23045, arg = 140733420915696, flag = 0, cr =
0x7fffef1a0e90, rvalp = 0x0)
handle_connection(sock = 8)
zfsfuse_ioctl_queue_worker_thread(init = 0x79ddc0 <ioctl_queue>)
start_thread(arg = 0x7fffef1a1700)
clone()
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