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Implemented zpool scrub pause/resume

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Currently, there is no way to pause a scrub. Pausing may
be useful when the pool is busy with other I/O to preserve
bandwidth.

This patch adds the ability to pause and resume scrubbing.
This is achieved by maintaining a persistent on-disk scrub state.
While the state is 'paused' we do not scrub any more blocks.
We do however perform regular scan housekeeping such as
freeing async destroyed and deadlist blocks while paused.

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Thomas Caputi <tcaputi@datto.com>
Reviewed-by: Serapheim Dimitropoulos <serapheimd@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alek Pinchuk <apinchuk@datto.com>
Closes #6167
This commit is contained in:
Alek P
2017-07-06 22:16:13 -07:00
committed by Brian Behlendorf
parent 94b25662c5
commit 0ea05c64f8
17 changed files with 364 additions and 126 deletions
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module/zfs/spa.c
+11
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@@ -29,6 +29,7 @@
* Copyright (c) 2014 Integros [integros.com]
* Copyright 2016 Toomas Soome <tsoome@me.com>
* Copyright (c) 2016 Actifio, Inc. All rights reserved.
* Copyright (c) 2017 Datto Inc.
*/
/*
@@ -5726,6 +5727,16 @@ spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru)
* SPA Scanning
* ==========================================================================
*/
int
spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t cmd)
{
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);
if (dsl_scan_resilvering(spa->spa_dsl_pool))
return (SET_ERROR(EBUSY));
return (dsl_scrub_set_pause_resume(spa->spa_dsl_pool, cmd));
}
int
spa_scan_stop(spa_t *spa)