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Add upper bound for slop space calculation

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This change modifies the behavior of how we determine how much slop
space to use in the pool, such that now it has an upper limit. The
default upper limit is 128G, but is configurable via a tunable.

(Backporting note: Snipped out the embedded_log portion of the changes.)

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Prakash Surya <prakash.surya@delphix.com>
Closes #11023
This commit is contained in:
Prakash Surya
2021-02-24 09:52:43 -08:00
committed by Tony Hutter
parent e9353bc2ef
commit 61ae6c99f7
2 changed files with 27 additions and 14 deletions
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include/sys/dsl_synctask.h
+5 -4
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@@ -41,10 +41,11 @@ typedef void (dsl_sigfunc_t)(void *, dmu_tx_t *);
typedef enum zfs_space_check {
/*
* Normal space check: if there is less than 3.2% free space,
* the operation will fail. Operations which are logically
* creating things should use this (e.g. "zfs create", "zfs snapshot").
* User writes (via the ZPL / ZVOL) also fail at this point.
* Normal space check: if there is less than 3.2% free space (bounded
* by spa_max_slop), the operation will fail. Operations which are
* logically creating things should use this (e.g. "zfs create", "zfs
* snapshot"). User writes (via the ZPL / ZVOL) also fail at this
* point.
*/
ZFS_SPACE_CHECK_NORMAL,