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Report pool suspended due to MMP

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When the pool is suspended, record whether it was due to an I/O error or
due to MMP writes failing to succeed within the required time.

Change spa_suspended from uint8_t to zio_suspend_reason_t to store the
reason.

When userspace queries pool status via spa_tryimport(), report the
reason the pool was suspended in a new key,
ZPOOL_CONFIG_SUSPENDED_REASON.

In libzfs, when interpreting the returned config nvlist, report
suspension due to MMP with a new pool status enum value,
ZPOOL_STATUS_IO_FAILURE_MMP.

In status_callback(), which generates and emits the message when 'zpool
status' is executed, add a case to print an appropriate message for the
new pool status enum value.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Closes #7296
This commit is contained in:
Olaf Faaland
2018-03-15 10:56:55 -07:00
committed by Tony Hutter
parent c234706270
commit 3eb3a13628
10 changed files with 38 additions and 11 deletions
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cmd/zpool/zpool_main.c
+9
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@@ -6395,6 +6395,15 @@ status_callback(zpool_handle_t *zhp, void *data)
"to be recovered.\n"));
break;
case ZPOOL_STATUS_IO_FAILURE_MMP:
(void) printf(gettext("status: The pool is suspended because "
"multihost writes failed or were delayed;\n\tanother "
"system could import the pool undetected.\n"));
(void) printf(gettext("action: Make sure the pool's devices "
"are connected, then reboot your system and\n\timport the "
"pool.\n"));
break;
case ZPOOL_STATUS_IO_FAILURE_WAIT:
case ZPOOL_STATUS_IO_FAILURE_CONTINUE:
(void) printf(gettext("status: One or more devices are "