Date: Mon, 11 Feb 2013 13:59:57 +0000 (UTC) From: Martin Matuska <mm@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r246675 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201302111359.r1BDxvT4016360@svn.freebsd.org>
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Author: mm Date: Mon Feb 11 13:59:57 2013 New Revision: 246675 URL: http://svnweb.freebsd.org/changeset/base/246675 Log: MFV r246394: Add tunable to allow block allocation on degraded vdevs. Illumos ZFS issues: 3507 Tunable to allow block allocation even on degraded vdevs References: https://www.illumos.org/issues/3507 MFC after: 2 weeks Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c Directory Properties: head/sys/cddl/contrib/opensolaris/ (props changed) Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c Mon Feb 11 13:57:03 2013 (r246674) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c Mon Feb 11 13:59:57 2013 (r246675) @@ -21,6 +21,7 @@ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2012 by Delphix. All rights reserved. + * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. */ #include <sys/zfs_context.h> @@ -97,6 +98,15 @@ int metaslab_prefetch_limit = SPA_DVAS_P int metaslab_smo_bonus_pct = 150; /* + * Should we be willing to write data to degraded vdevs? + */ +boolean_t zfs_write_to_degraded = B_FALSE; +SYSCTL_INT(_vfs_zfs, OID_AUTO, write_to_degraded, CTLFLAG_RW, + &zfs_write_to_degraded, 0, + "Allow writing data to degraded vdevs"); +TUNABLE_INT("vfs.zfs.write_to_degraded", &zfs_write_to_degraded); + +/* * ========================================================================== * Metaslab classes * ========================================================================== @@ -1383,10 +1393,13 @@ top: /* * Avoid writing single-copy data to a failing vdev + * unless the user instructs us that it is okay. */ if ((vd->vdev_stat.vs_write_errors > 0 || vd->vdev_state < VDEV_STATE_HEALTHY) && - d == 0 && dshift == 3) { + d == 0 && dshift == 3 && + !(zfs_write_to_degraded && vd->vdev_state == + VDEV_STATE_DEGRADED)) { all_zero = B_FALSE; goto next; }
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