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Increase allowed 'special_small_blocks' maximum value

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There may be circumstances where it's desirable that all blocks
in a specified dataset be stored on the special device.  Relax
the artificial 128K limit and allow the special_small_blocks
property to be set up to 1M.  When blocks >1MB have been enabled
via the zfs_max_recordsize module option, this limit is increased
accordingly.

Reviewed-by: Don Brady <don.brady@delphix.com>
Reviewed-by: Kjeld Schouten <kjeld@schouten-lebbing.nl>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9131
Closes #9355
This commit is contained in:
Brian Behlendorf
2019-12-03 09:58:03 -08:00
committed by Tony Hutter
parent 85204e30dd
commit 9cf46ddedc
4 changed files with 17 additions and 7 deletions
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man/man8/zfs.8
+1 -1
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@@ -1545,7 +1545,7 @@ This value represents the threshold block size for including small file
blocks into the special allocation class. Blocks smaller than or equal to this
value will be assigned to the special allocation class while greater blocks
will be assigned to the regular class. Valid values are zero or a power of two
from 512B up to 128K. The default size is 0 which means no small file blocks
from 512B up to 1M. The default size is 0 which means no small file blocks
will be allocated in the special class.
.Pp
Before setting this property, a special class vdev must be added to the