- close (fd);
-
- md_submit (minor, "number", (gauge_t) array.nr_disks);
- md_submit (minor, "raid", (gauge_t) array.raid_disks);
- md_submit (minor, "active", (gauge_t) array.active_disks);
- md_submit (minor, "working", (gauge_t) array.working_disks);
- md_submit (minor, "failed", (gauge_t) array.failed_disks);
- md_submit (minor, "spare", (gauge_t) array.spare_disks);
-
- return;
+ close(fd);
+
+ /*
+ * The mdu_array_info_t structure contains numbers of disks in the array.
+ * However, disks are accounted for more than once:
+ *
+ * active: Number of active (in sync) disks.
+ * spare: Number of stand-by disks.
+ * working: Number of working disks. (active + sync)
+ * failed: Number of failed disks.
+ * nr: Number of physically present disks. (working + failed)
+ * raid: Number of disks in the RAID. This may be larger than "nr" if
+ * disks are missing and smaller than "nr" when spare disks are
+ * around.
+ */
+ md_submit(minor, "active", (gauge_t)array.active_disks);
+ md_submit(minor, "failed", (gauge_t)array.failed_disks);
+ md_submit(minor, "spare", (gauge_t)array.spare_disks);
+
+ disks_missing = 0.0;
+ if (array.raid_disks > array.nr_disks)
+ disks_missing = (gauge_t)(array.raid_disks - array.nr_disks);
+ md_submit(minor, "missing", disks_missing);