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Add illumos FMD ZFS logic to ZED -- phase 2

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The phase 2 work primarily entails the Diagnosis Engine and
the Retire Agent modules. It also includes infrastructure
to support a crude FMD environment to host these modules.

The Diagnosis Engine consumes I/O and checksum ereports and
feeds them into a SERD engine which will generate a corres-
ponding fault diagnosis when the SERD engine fires. All the
diagnosis state data is collected into cases, one case per
vdev being tracked.

The Retire Agent responds to diagnosed faults by isolating
the faulty VDEV. It will notify the ZFS kernel module of
the new VDEV state (degraded or faulted). This agent is
also responsible for managing hot spares across pools.
When it encounters a device fault or a device removal it
replaces the device with an appropriate spare if available.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Don Brady <don.brady@intel.com>
Closes #5343
This commit is contained in:
Don Brady
2016-11-07 16:01:38 -07:00
committed by Brian Behlendorf
parent f4bae2ed63
commit 976246fadd
17 changed files with 3597 additions and 343 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cmd/zed/zed_exec.c
+39 -8
View File
@@ -20,6 +20,7 @@
#include <string.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include "zed_file.h"
#include "zed_log.h"
@@ -115,19 +116,39 @@ _zed_exec_fork_child(uint64_t eid, const char *dir, const char *prog,
zed_file_close_from(ZEVENT_FILENO + 1);
execle(path, prog, NULL, env);
_exit(127);
} else {
zed_log_msg(LOG_INFO, "Invoking \"%s\" eid=%llu pid=%d",
prog, eid, pid);
/* FIXME: Timeout rogue child processes with sigalarm? */
restart:
wpid = waitpid(pid, &status, 0);
}
/* parent process */
zed_log_msg(LOG_INFO, "Invoking \"%s\" eid=%llu pid=%d",
prog, eid, pid);
/* FIXME: Timeout rogue child processes with sigalarm? */
/*
* Wait for child process using WNOHANG to limit
* the time spent waiting to 10 seconds (10,000ms).
*/
for (n = 0; n < 1000; n++) {
wpid = waitpid(pid, &status, WNOHANG);
if (wpid == (pid_t) -1) {
if (errno == EINTR)
goto restart;
continue;
zed_log_msg(LOG_WARNING,
"Failed to wait for \"%s\" eid=%llu pid=%d",
prog, eid, pid);
} else if (WIFEXITED(status)) {
break;
} else if (wpid == 0) {
struct timespec t;
/* child still running */
t.tv_sec = 0;
t.tv_nsec = 10000000; /* 10ms */
(void) nanosleep(&t, NULL);
continue;
}
if (WIFEXITED(status)) {
zed_log_msg(LOG_INFO,
"Finished \"%s\" eid=%llu pid=%d exit=%d",
prog, eid, pid, WEXITSTATUS(status));
@@ -141,6 +162,16 @@ restart:
"Finished \"%s\" eid=%llu pid=%d status=0x%X",
prog, eid, (unsigned int) status);
}
break;
}
/*
* kill child process after 10 seconds
*/
if (wpid == 0) {
zed_log_msg(LOG_WARNING, "Killing hung \"%s\" pid=%d",
prog, pid);
(void) kill(pid, SIGKILL);
}
}