Date: Sat, 4 Oct 2014 07:34:50 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org Subject: svn commit: r272496 - vendor-sys/illumos/dist/uts/common/fs/zfs Message-ID: <201410040734.s947YoiV084134@svn.freebsd.org>
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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.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@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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