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64bdf63f5c
mirror_zfs/module/zfs
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Brian Behlendorf 64bdf63f5c
ztest: split block reconstruction 
Increase the default allowed number of reconstruction attempts.
There's not an exact right number for this setting.  It needs
to be set large enough to cover any realistic failure scenarios
and small enough to avoid stalling the IO pipeline and invoking
the dead man detection.

The current value of 256 was empirically determined to be too
low based on multi-day runs of ztest.  The fault injection code
would inject more damage than could be reconstructed given the
relatively small number of attempts.  However, in all observed
cases the block could be reconstructed using a slightly higher
limit.

Based on local testing increasing the default value to 4096 was
determined to strike the best balance.  Checking all combinations
takes less than 10s in the worst case, and has so far eliminated
the vast majority of false positives detected by ztest.  This
delay is roughly on par with how long retries may be performed
to a misbehaving HDD and was deemed to be reasonable.  Better to
err on the side of a brief delay rather than fail to reconstruct
the data.

Lastly, the -Y flag has been added to zdb to make it easy to try all
possible combinations when performing split block reconstruction.
For badly damaged blocks with 18 splits, they can be fully enumerated
within a few minutes.  This has been done to ensure permanent errors
are never incorrectly reported when ztest verifies the pool with zdb.

Reviewed by: Tom Caputi <tcaputi@datto.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: Serapheim Dimitropoulos <serapheim@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8271
2019-01-16 14:10:02 -08:00
..
abd.c Prefix all refcount functions with zfs_ 2018-10-01 10:42:05 -07:00
aggsum.c OpenZFS 9688 - aggsum_fini leaks memory 2018-10-19 12:08:03 -07:00
arc.c Serialize ZTHR operations to eliminate races 2019-01-13 10:09:46 -08:00
blkptr.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
bplist.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
bpobj.c bpobj_enqueue_subobj() should copy small subobj's 2018-10-31 11:58:17 -05:00
bptree.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
bqueue.c Call cv_signal() with mutex held 2017-06-26 14:36:49 -07:00
cityhash.c OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
dataset_kstats.c Introduce read/write kstats per dataset 2018-08-20 09:52:37 -07:00
dbuf_stats.c Prefix all refcount functions with zfs_ 2018-10-01 10:42:05 -07:00
dbuf.c Fix zio leak in dbuf_read() 2019-01-15 12:23:40 -08:00
ddt_zap.c Update build system and packaging 2018-05-29 16:00:33 -07:00
ddt.c Update build system and packaging 2018-05-29 16:00:33 -07:00
dmu_diff.c Fix issues found with zfs diff 2018-05-01 11:24:20 -07:00
dmu_object.c Provide more flexible object allocation interface 2019-01-10 14:37:43 -08:00
dmu_objset.c Add types to featureflags in zfs 2018-10-16 11:15:04 -07:00
dmu_recv.c Provide more flexible object allocation interface 2019-01-10 14:37:43 -08:00
dmu_send.c Add types to featureflags in zfs 2018-10-16 11:15:04 -07:00
dmu_traverse.c Fix traverse_impl() kmem leak 2018-08-15 09:53:44 -07:00
dmu_tx.c Prefix all refcount functions with zfs_ 2018-10-01 10:42:05 -07:00
dmu_zfetch.c Update build system and packaging 2018-05-29 16:00:33 -07:00
dmu.c Provide more flexible object allocation interface 2019-01-10 14:37:43 -08:00
dnode_sync.c Add types to featureflags in zfs 2018-10-16 11:15:04 -07:00
dnode.c Don't allow dnode allocation if dn_holds != 0 2019-01-10 14:36:23 -08:00
dsl_bookmark.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
dsl_crypt.c Replay logs before starting ztest workers 2018-11-07 15:40:24 -08:00
dsl_dataset.c Add types to featureflags in zfs 2018-10-16 11:15:04 -07:00
dsl_deadlist.c OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
dsl_deleg.c Update build system and packaging 2018-05-29 16:00:33 -07:00
dsl_destroy.c zfs receive and rollback can skew filesystem_count 2019-01-08 10:17:46 -08:00
dsl_dir.c zfs_ioc_unload_key can drop extra spa ref 2018-08-03 14:50:51 -07:00
dsl_pool.c Fix zfs_dirty_data_sync_percent documentation 2018-12-18 14:47:33 -08:00
dsl_prop.c Update build system and packaging 2018-05-29 16:00:33 -07:00
dsl_scan.c Ensure dsl scan prefetch queue is emptied 2018-12-06 09:47:23 -08:00
dsl_synctask.c OpenZFS 9166 - zfs storage pool checkpoint 2018-06-26 10:07:42 -07:00
dsl_userhold.c OpenZFS 9166 - zfs storage pool checkpoint 2018-06-26 10:07:42 -07:00
edonr_zfs.c DLPX-44812 integrate EP-220 large memory scalability 2016-11-29 14:34:27 -08:00
fm.c OpenZFS 9580 - Add a hash-table on top of nvlist to speed-up operations 2018-07-30 11:30:03 -07:00
gzip.c Update build system and packaging 2018-05-29 16:00:33 -07:00
hkdf.c Encryption patch follow-up 2017-10-11 16:54:48 -04:00
lz4.c Fix LZ4_uncompress_unknownOutputSize caused panic 2017-05-19 13:45:46 -07:00
lzjb.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
Makefile.in OpenZFS 9102 - zfs should be able to initialize storage devices 2019-01-07 10:37:26 -08:00
metaslab.c OpenZFS 9102 - zfs should be able to initialize storage devices 2019-01-07 10:37:26 -08:00
mmp.c Update build system and packaging 2018-05-29 16:00:33 -07:00
multilist.c Update build system and packaging 2018-05-29 16:00:33 -07:00
pathname.c Update build system and packaging 2018-05-29 16:00:33 -07:00
policy.c Take user namespaces into account in policy checks 2018-03-07 15:40:42 -08:00
qat_compress.c Fix inst_num overflow in qat_crypt.c 2018-05-01 20:44:24 -07:00
qat_crypt.c Fix inst_num overflow in qat_crypt.c 2018-05-01 20:44:24 -07:00
qat.c SHA256 QAT acceleration 2018-03-15 10:53:58 -07:00
qat.h Resolve QAT issues with incompressible data 2018-03-29 17:40:34 -07:00
range_tree.c OpenZFS 9166 - zfs storage pool checkpoint 2018-06-26 10:07:42 -07:00
refcount.c Add zfs_refcount_transfer_ownership_many() 2018-10-09 10:05:48 -07:00
rrwlock.c Prefix all refcount functions with zfs_ 2018-10-01 10:42:05 -07:00
sa.c Prefix all refcount functions with zfs_ 2018-10-01 10:42:05 -07:00
sha256.c SHA256 QAT acceleration 2018-03-15 10:53:58 -07:00
skein_zfs.c DLPX-44812 integrate EP-220 large memory scalability 2016-11-29 14:34:27 -08:00
spa_boot.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_checkpoint.c Serialize ZTHR operations to eliminate races 2019-01-13 10:09:46 -08:00
spa_config.c OpenZFS 9591 - ms_shift can be incorrectly changed 2018-06-21 09:35:26 -07:00
spa_errlog.c Update build system and packaging 2018-05-29 16:00:33 -07:00
spa_history.c Create /proc/sys/kernel/spl/gitrev with git hash 2018-10-08 21:57:02 -07:00
spa_misc.c zfs initialize performance enhancements 2019-01-07 11:03:08 -08:00
spa_stats.c Fixes for procfs files backed by linked lists 2018-09-26 11:08:12 -07:00
spa.c Serialize ZTHR operations to eliminate races 2019-01-13 10:09:46 -08:00
space_map.c OpenZFS 9442 - decrease indirect block size of spacemaps 2018-07-25 14:11:35 -07:00
space_reftree.c OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
THIRDPARTYLICENSE.cityhash OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
THIRDPARTYLICENSE.cityhash.descrip OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
trace.c OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
txg.c Fix lock inversion in txg_sync_thread() 2018-10-24 14:37:02 -07:00
uberblock.c OpenZFS 9166 - zfs storage pool checkpoint 2018-06-26 10:07:42 -07:00
unique.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
vdev_cache.c Update build system and packaging 2018-05-29 16:00:33 -07:00
vdev_disk.c OpenZFS 9102 - zfs should be able to initialize storage devices 2019-01-07 10:37:26 -08:00
vdev_file.c OpenZFS 9102 - zfs should be able to initialize storage devices 2019-01-07 10:37:26 -08:00
vdev_indirect_births.c Update build system and packaging 2018-05-29 16:00:33 -07:00
vdev_indirect_mapping.c OpenZFS 9847 - leaking dd_clones (DMU_OT_DSL_CLONES) objects (#7979) 2018-10-12 11:28:26 -07:00
vdev_indirect.c ztest: split block reconstruction 2019-01-16 14:10:02 -08:00
vdev_initialize.c zfs initialize performance enhancements 2019-01-07 11:03:08 -08:00
vdev_label.c Fix coverity defects: CID 184285 2018-11-11 18:09:00 -08:00
vdev_mirror.c OpenZFS 8473 - scrub does not detect errors on active spares 2019-01-08 09:51:30 -08:00
vdev_missing.c OpenZFS 9102 - zfs should be able to initialize storage devices 2019-01-07 10:37:26 -08:00
vdev_queue.c OpenZFS 9102 - zfs should be able to initialize storage devices 2019-01-07 10:37:26 -08:00
vdev_raidz_math_aarch64_neon_common.h ABD raidz NEON support 2016-11-29 14:34:33 -08:00
vdev_raidz_math_aarch64_neon.c codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz_math_aarch64_neonx2.c ABD raidz NEON support 2016-11-29 14:34:33 -08:00
vdev_raidz_math_avx2.c ABD raidz avx512f support 2016-11-29 14:34:33 -08:00
vdev_raidz_math_avx512bw.c ABD: Adapt avx512bw raidz assembly 2016-12-15 17:31:33 -08:00
vdev_raidz_math_avx512f.c Use cstyle -cpP in make cstyle check 2016-12-12 10:46:26 -08:00
vdev_raidz_math_impl.h codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz_math_scalar.c ABD Vectorized raidz 2016-11-29 14:34:33 -08:00
vdev_raidz_math_sse2.c ABD raidz avx512f support 2016-11-29 14:34:33 -08:00
vdev_raidz_math_ssse3.c codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz_math.c Update build system and packaging 2018-05-29 16:00:33 -07:00
vdev_raidz.c OpenZFS 9102 - zfs should be able to initialize storage devices 2019-01-07 10:37:26 -08:00
vdev_removal.c zfs initialize performance enhancements 2019-01-07 11:03:08 -08:00
vdev_root.c OpenZFS 9102 - zfs should be able to initialize storage devices 2019-01-07 10:37:26 -08:00
vdev.c zfs initialize performance enhancements 2019-01-07 11:03:08 -08:00
zap_leaf.c OpenZFS 9328 - zap code can take advantage of c99 2018-05-31 10:53:11 -07:00
zap_micro.c Provide more flexible object allocation interface 2019-01-10 14:37:43 -08:00
zap.c OpenZFS 9328 - zap code can take advantage of c99 2018-05-31 10:53:11 -07:00
zcp_get.c Fix coverity defects: zfs channel programs 2018-02-20 11:19:42 -08:00
zcp_global.c OpenZFS 8600 - ZFS channel programs - snapshot 2018-02-08 15:29:24 -08:00
zcp_iter.c OpenZFS 9337 - zfs get all is slow due to uncached metadata 2018-07-12 10:49:27 -07:00
zcp_synctask.c OpenZFS 9166 - zfs storage pool checkpoint 2018-06-26 10:07:42 -07:00
zcp.c OpenZFS 9424 - ztest failure: "unprotected error in call to Lua API (Invalid value type 'function' for key 'error')" 2018-07-10 21:29:23 -07:00
zfeature.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
zfs_acl.c Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_byteswap.c Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_ctldir.c Update zfs_admin_snapshot value (disabled) 2018-11-08 16:17:12 -08:00
zfs_debug.c Fix dbgmsg printing in ztest and zdb 2018-10-24 14:36:50 -07:00
zfs_dir.c Linux does not HAVE_DNLC 2018-10-17 10:30:08 -07:00
zfs_fm.c Add zpool status -s (slow I/Os) and -p (parseable) 2018-11-08 16:47:24 -08:00
zfs_fuid.c Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_ioctl.c zfs initialize performance enhancements 2019-01-07 11:03:08 -08:00
zfs_log.c Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_onexit.c Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_ratelimit.c Change checksum & IO delay ratelimit values 2018-03-04 17:34:51 -08:00
zfs_replay.c Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_rlock.c OpenZFS 9689 - zfs range lock code should not be zpl-specific 2018-10-11 10:19:33 -07:00
zfs_sa.c Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_sysfs.c OpenZFS 9102 - zfs should be able to initialize storage devices 2019-01-07 10:37:26 -08:00
zfs_vfsops.c zfs filesystem skipped by df -h 2019-01-13 10:06:13 -08:00
zfs_vnops.c OpenZFS 9962 - zil_commit should omit cache thrash 2018-12-07 11:09:42 -08:00
zfs_znode.c Linux does not HAVE_SMB_SHARE 2018-10-17 10:31:38 -07:00
zil.c OpenZFS 9962 - zil_commit should omit cache thrash 2018-12-07 11:09:42 -08:00
zio_checksum.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
zio_compress.c OpenZFS 9403 - assertion failed in arc_buf_destroy() 2018-08-29 11:33:33 -07:00
zio_crypt.c Update build system and packaging 2018-05-29 16:00:33 -07:00
zio_inject.c Add libzutil for libzfs or libzpool consumers 2018-11-05 11:22:33 -08:00
zio.c Minor spelling corrections 2019-01-13 10:11:52 -08:00
zle.c Fix zle_decompress out of bound access 2018-02-09 10:08:05 -08:00
zpl_ctldir.c RHEL 7.5 compat: FMODE_KABI_ITERATE 2018-05-02 15:01:24 -07:00
zpl_export.c Use cstyle -cpP in make cstyle check 2016-12-12 10:46:26 -08:00
zpl_file.c Direct IO support 2018-08-27 10:04:21 -07:00
zpl_inode.c Linux 4.18 compat: inode timespec -> timespec64 2018-06-19 21:51:18 -07:00
zpl_super.c Fix statfs(2) for 32-bit user space 2018-09-24 17:11:25 -07:00
zpl_xattr.c Add missing checks to zpl_xattr_* functions 2018-08-02 14:03:56 -07:00
zrlock.c Update build system and packaging 2018-05-29 16:00:33 -07:00
zthr.c Serialize ZTHR operations to eliminate races 2019-01-13 10:09:46 -08:00
zvol.c OpenZFS 9962 - zil_commit should omit cache thrash 2018-12-07 11:09:42 -08:00