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Default to zfs_dmu_offset_next_sync=1

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Strict hole reporting was previously disabled by default as a
performance optimization.  However, this has lead to confusion
over the expected behavior and a variety of workarounds being
adopted by consumers of ZFS.  Change the default behavior to
always report holes and force the TXG sync.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #12746
This commit is contained in:
Brian Behlendorf
2021-11-30 10:38:09 -08:00
committed by GitHub
parent 5dc6fc2b73
commit 05b3eb6d23
2 changed files with 12 additions and 8 deletions
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man/man4/zfs.4
+4 -4
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@@ -1591,12 +1591,12 @@ Allow no-operation writes.
The occurrence of nopwrites will further depend on other pool properties
.Pq i.a. the checksumming and compression algorithms .
.
.It Sy zfs_dmu_offset_next_sync Ns = Ns Sy 0 Ns | Ns 1 Pq int
.It Sy zfs_dmu_offset_next_sync Ns = Ns Sy 1 Ns | Ns 0 Pq int
Enable forcing TXG sync to find holes.
When enabled forces ZFS to act like prior versions when
When enabled forces ZFS to sync data when
.Sy SEEK_HOLE No or Sy SEEK_DATA
flags are used, which, when a dnode is dirty,
causes TXGs to be synced so that this data can be found.
flags are used allowing holes in a file to be accurately reported.
When disabled holes will not be reported in recently dirtied files.
.
.It Sy zfs_pd_bytes_max Ns = Ns Sy 52428800 Ns B Po 50MB Pc Pq int
The number of bytes which should be prefetched during a pool traversal, like