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Add spa_slop_shift module option

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Allow for easy turning of a pools reserved free space.  Previous
versions of ZFS (v0.6.4 and earlier) held 1/64 of the pools capacity
in reserve.  Commits 3d45fdd and 0c60cc3 increased this to 1/32.
Setting spa_slop_shift=6 will restore the previous default setting.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3724
This commit is contained in:
Brian Behlendorf
2015-09-01 09:45:10 -07:00
parent 3f1cc17c90
commit 6cde64351e
2 changed files with 19 additions and 0 deletions
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module/zfs/spa_misc.c
+3
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@@ -2094,4 +2094,7 @@ MODULE_PARM_DESC(zfs_deadman_enabled, "Enable deadman timer");
module_param(spa_asize_inflation, int, 0644);
MODULE_PARM_DESC(spa_asize_inflation,
"SPA size estimate multiplication factor");
module_param(spa_slop_shift, int, 0644);
MODULE_PARM_DESC(spa_slop_shift, "Reserved free space in pool");
#endif