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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
84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_METASLAB_H
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#define _SYS_METASLAB_H
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#include <sys/spa.h>
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#include <sys/space_map.h>
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#include <sys/txg.h>
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#include <sys/zio.h>
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#include <sys/avl.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern space_map_ops_t *zfs_metaslab_ops;
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extern metaslab_t *metaslab_init(metaslab_group_t *mg, space_map_obj_t *smo,
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uint64_t start, uint64_t size, uint64_t txg);
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extern void metaslab_fini(metaslab_t *msp);
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extern void metaslab_sync(metaslab_t *msp, uint64_t txg);
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extern void metaslab_sync_done(metaslab_t *msp, uint64_t txg);
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extern void metaslab_sync_reassess(metaslab_group_t *mg);
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#define METASLAB_HINTBP_FAVOR 0x0
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#define METASLAB_HINTBP_AVOID 0x1
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#define METASLAB_GANG_HEADER 0x2
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#define METASLAB_GANG_CHILD 0x4
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#define METASLAB_GANG_AVOID 0x8
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extern int metaslab_alloc(spa_t *spa, metaslab_class_t *mc, uint64_t psize,
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blkptr_t *bp, int ncopies, uint64_t txg, blkptr_t *hintbp, int flags);
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extern void metaslab_free(spa_t *spa, const blkptr_t *bp, uint64_t txg,
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boolean_t now);
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extern int metaslab_claim(spa_t *spa, const blkptr_t *bp, uint64_t txg);
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extern metaslab_class_t *metaslab_class_create(spa_t *spa,
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space_map_ops_t *ops);
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extern void metaslab_class_destroy(metaslab_class_t *mc);
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extern int metaslab_class_validate(metaslab_class_t *mc);
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extern void metaslab_class_space_update(metaslab_class_t *mc,
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int64_t alloc_delta, int64_t defer_delta,
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int64_t space_delta, int64_t dspace_delta);
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extern uint64_t metaslab_class_get_alloc(metaslab_class_t *mc);
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extern uint64_t metaslab_class_get_space(metaslab_class_t *mc);
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extern uint64_t metaslab_class_get_dspace(metaslab_class_t *mc);
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extern uint64_t metaslab_class_get_deferred(metaslab_class_t *mc);
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extern metaslab_group_t *metaslab_group_create(metaslab_class_t *mc,
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vdev_t *vd);
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extern void metaslab_group_destroy(metaslab_group_t *mg);
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extern void metaslab_group_activate(metaslab_group_t *mg);
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extern void metaslab_group_passivate(metaslab_group_t *mg);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_METASLAB_H */
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