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man: update recordsize max size info

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Reflect f2330bd156
change in our man pages and add some context.

Wording is primarily copy-pasted from code comments.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by:  Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: George Melikov <mail@gmelikov.ru>
Closes #16581
This commit is contained in:
George Melikov 2024-09-29 23:19:52 +03:00 committed by Tony Hutter
parent 48482bb2f4
commit 2bd540d273
2 changed files with 17 additions and 1 deletions
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5
man/man4/zfs.4
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@ -1607,6 +1607,11 @@ Therefore, we formerly forbade creating blocks larger than 1M.
Larger blocks could be created by changing it, Larger blocks could be created by changing it,
and pools with larger blocks can always be imported and used, and pools with larger blocks can always be imported and used,
regardless of this setting. regardless of this setting.
.Pp
Note that it is still limited by default to
.Ar 1 MiB
on x86_32, because Linux's
3/1 memory split doesn't leave much room for 16M chunks.
. .
.It Sy zfs_allow_redacted_dataset_mount Ns = Ns Sy 0 Ns | Ns 1 Pq int .It Sy zfs_allow_redacted_dataset_mount Ns = Ns Sy 0 Ns | Ns 1 Pq int
Allow datasets received with redacted send/receive to be mounted. Allow datasets received with redacted send/receive to be mounted.

13
man/man7/zfsprops.7
View File

@ -1463,11 +1463,22 @@ and less than or equal to
If the If the
.Sy large_blocks .Sy large_blocks
feature is enabled on the pool, the size may be up to feature is enabled on the pool, the size may be up to
.Ar 1 MiB . .Ar 16 MiB .
See See
.Xr zpool-features 7 .Xr zpool-features 7
for details on ZFS feature flags. for details on ZFS feature flags.
.Pp .Pp
However, blocks larger than
.Ar 1 MiB
can have an impact on i/o latency (e.g. tying up a spinning disk for
~300ms), and also potentially on the memory allocator.
.Pp
Note that maximum size is still limited by default to
.Ar 1 MiB
on x86_32, see
.Sy zfs_max_recordsize
module parameter.
.Pp
Changing the file system's Changing the file system's
.Sy recordsize .Sy recordsize
affects only files created afterward; existing files are unaffected. affects only files created afterward; existing files are unaffected.