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Illumos #1051: zfs should handle imbalanced luns

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Today zfs tries to allocate blocks evenly across all devices.
This means when devices are imbalanced zfs will use lots of
CPU searching for space on devices which tend to be pretty
full.  It should instead fail quickly on the full LUNs and
move onto devices which have more availability.

Reviewed by: Eric Schrock <Eric.Schrock@delphix.com>
Reviewed by: Matt Ahrens <Matt.Ahrens@delphix.com>
Reviewed by: Adam Leventhal <Adam.Leventhal@delphix.com>
Reviewed by: Albert Lee <trisk@nexenta.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Approved by: Garrett D'Amore <garrett@nexenta.com>

References to Illumos issue and patch:
- https://www.illumos.org/issues/510
- https://github.com/illumos/illumos-gate/commit/5ead3ed965

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #340
This commit is contained in:
George Wilson
2011-07-26 12:08:52 -07:00
committed by Brian Behlendorf
parent bb939d1085
commit 6d974228ef
8 changed files with 123 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/metaslab.h
+3
View File
@@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
#ifndef _SYS_METASLAB_H
@@ -47,6 +48,8 @@ extern void metaslab_sync_reassess(metaslab_group_t *mg);
#define METASLAB_HINTBP_FAVOR 0x0
#define METASLAB_HINTBP_AVOID 0x1
#define METASLAB_GANG_HEADER 0x2
#define METASLAB_GANG_CHILD 0x4
#define METASLAB_GANG_AVOID 0x8
extern int metaslab_alloc(spa_t *spa, metaslab_class_t *mc, uint64_t psize,
blkptr_t *bp, int ncopies, uint64_t txg, blkptr_t *hintbp, int flags);
include/sys/metaslab_impl.h
+2
View File
@@ -21,6 +21,7 @@
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
#ifndef _SYS_METASLAB_IMPL_H
@@ -52,6 +53,7 @@ struct metaslab_group {
avl_tree_t mg_metaslab_tree;
uint64_t mg_aliquot;
uint64_t mg_bonus_area;
uint64_t mg_alloc_failures;
int64_t mg_bias;
int64_t mg_activation_count;
metaslab_class_t *mg_class;
include/sys/spa.h
+8
View File
@@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
#ifndef _SYS_SPA_H
@@ -698,6 +699,13 @@ _NOTE(CONSTCOND) } while (0)
#define dprintf_bp(bp, fmt, ...)
#endif
extern boolean_t spa_debug_enabled(spa_t *spa);
#define spa_dbgmsg(spa, ...) \
{ \
if (spa_debug_enabled(spa)) \
zfs_dbgmsg(__VA_ARGS__); \
}
extern int spa_mode_global; /* mode, e.g. FREAD | FWRITE */
#ifdef __cplusplus
include/sys/spa_impl.h
+2
View File
@@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
#ifndef _SYS_SPA_IMPL_H
@@ -196,6 +197,7 @@ struct spa {
kcondvar_t spa_suspend_cv; /* notification of resume */
uint8_t spa_suspended; /* pool is suspended */
uint8_t spa_claiming; /* pool is doing zil_claim() */
boolean_t spa_debug; /* debug enabled? */
boolean_t spa_is_root; /* pool is root */
int spa_minref; /* num refs when first opened */
int spa_mode; /* FREAD | FWRITE */