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OpenZFS 8961 - SPA load/import should tell us why it failed

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Problem
=======

When we fail to open or import a storage pool, we typically don't
get any additional diagnostic information, just "no pool found" or
"can not import".

While there may be no additional user-consumable information, we should
at least make this situation easier to debug/diagnose for developers
and support.  For example, we could start by using `zfs_dbgmsg()`
to log each thing that we try when importing, and which things
failed. E.g. "tried uberblock of txg X from label Y of device Z". Also,
we could log each of the stages that we go through in `spa_load_impl()`.

Solution
========

Following the cleanup to `spa_load_impl()`, debug messages have been
added to every point of failure in that function. Additionally,
debug messages have been added to strategic places, such as
`vdev_disk_open()`.

Authored by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Andrew Stormont <andyjstormont@gmail.com>
Approved by: Dan McDonald <danmcd@joyent.com>
Ported-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Tim Chase <tim@chase2k.com>

OpenZFS-issue: https://illumos.org/issues/8961
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/418079e0
Closes #7459
This commit is contained in:
Pavel Zakharov
2016-03-10 10:16:02 -05:00
committed by Brian Behlendorf
parent ca0845d59e
commit 4a0ee12af8
7 changed files with 281 additions and 75 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/vdev_label.c
+9 -2
View File
@@ -21,7 +21,7 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
*/
/*
@@ -1204,8 +1204,15 @@ vdev_uberblock_load(vdev_t *rvd, uberblock_t *ub, nvlist_t **config)
* Search all labels on this vdev to find the configuration that
* matches the txg for our uberblock.
*/
if (cb.ubl_vd != NULL)
if (cb.ubl_vd != NULL) {
vdev_dbgmsg(cb.ubl_vd, "best uberblock found for spa %s. "
"txg %llu", spa->spa_name, (u_longlong_t)ub->ub_txg);
*config = vdev_label_read_config(cb.ubl_vd, ub->ub_txg);
if (*config == NULL) {
vdev_dbgmsg(cb.ubl_vd, "failed to read label config");
}
}
spa_config_exit(spa, SCL_ALL, FTAG);
}