Author: delphij
Date: Sat Oct 4 07:34:50 2014
New Revision: 272496
URL: https://svnweb.freebsd.org/changeset/base/272496
Log:
5161 add tunable for number of metaslabs per vdev
Reviewed by: Alex Reece <alex.re...@delphix.com>
Reviewed by: Christopher Siden <christopher.si...@delphix.com>
Reviewed by: George Wilson <george.wil...@delphix.com>
Reviewed by: Paul Dagnelie <paul.dagne...@delphix.com>
Reviewed by: Saso Kiselkov <skiselkov...@gmail.com>
Reviewed by: Richard Elling <richard.ell...@gmail.com>
Approved by: Richard Lowe <richl...@richlowe.net>
Author: Matthew Ahrens <mahr...@delphix.com>
illumos/illumos-gate@bf3e216c7efa56332b456f4cf19d208e21d63839
Modified:
vendor-sys/illumos/dist/uts/common/fs/zfs/vdev.c
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/vdev.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/vdev.c Sat Oct 4 07:32:19
2014 (r272495)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/vdev.c Sat Oct 4 07:34:50
2014 (r272496)
@@ -65,6 +65,12 @@ static vdev_ops_t *vdev_ops_table[] = {
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.
*/
static vdev_ops_t *
@@ -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);
}
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