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5161 add tunable for number of metaslabs per vdev

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Reviewed by: Alex Reece <alex.reece@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Paul Dagnelie <paul.dagnelie@delphix.com>
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Reviewed by: Richard Elling <richard.elling@gmail.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
Author:	Matthew Ahrens <mahrens@delphix.com>

illumos/illumos-gate@bf3e216c7e
This commit is contained in:
Xin LI 2014-10-04 07:34:50 +00:00
parent 3c5da9147d
commit 5fce0b0809
1 changed files with 8 additions and 2 deletions
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10
uts/common/fs/zfs/vdev.c
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@ -64,6 +64,12 @@ static vdev_ops_t *vdev_ops_table[] = {
/* maximum scrub/resilver I/O queue per leaf vdev */
int zfs_scrub_limit = 10;
/*
* When a vdev is added, it will be divided into approximately (but no
* more than) this number of metaslabs.
*/
int metaslabs_per_vdev = 200;
/*
* Given a vdev type, return the appropriate ops vector.
*/
@ -1551,9 +1557,9 @@ void
vdev_metaslab_set_size(vdev_t *vd)
{
/*
* Aim for roughly 200 metaslabs per vdev.
* Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev.
*/
vd->vdev_ms_shift = highbit64(vd->vdev_asize / 200);
vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev);
vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT);
}