I'm writing a monitoring plugin for a home server RAID, mdadm on Ubuntu 10.4.
Using sudo mdadm --detail /dev/md0
I get output like this:
/dev/md0:
Version : 00.90
Creation Time : Thu Dec 17 14:31:49 2009
Raid Level : raid5
Array Size : 4395407808 (4191.79 GiB 4500.90 GB)
Used Dev Size : 1465135936 (1397.26 GiB 1500.30 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Sun Jul 11 06:57:28 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
...
I'm looking for the possible values of "state" but can't seem to find it anywhere, neither man nor the online documentation I have found seem to have a list.
Does anyone know where to find a list of possible states?
1 Answer
Based on the source code, ("clean" or "active") and ("degraded" or "") and ("" or "resyncing" or "recovering") and ("" or "Not Started").
if (array.raid_disks)
printf(" State : %s%s%s%s\n",
(array.state&(1<<MD_SB_CLEAN))?"clean":"active",
array.active_disks < array.raid_disks? ", degraded":"",
(!e || e->percent < 0) ? "" :
(e->resync) ? ", resyncing": ", recovering",
larray_size ? "": ", Not Started");
You didn't ask about disk.state, but here is the relevant source code:
if (disk.state & (1<<MD_DISK_FAULTY)) {
printf(" faulty");
if (disk.raid_disk < array.raid_disks &&
disk.raid_disk >= 0)
failed++;
}
if (disk.state & (1<<MD_DISK_ACTIVE)) printf(" active");
if (disk.state & (1<<MD_DISK_SYNC)) printf(" sync");
if (disk.state & (1<<MD_DISK_REMOVED)) printf(" removed");
if (disk.state & (1<<MD_DISK_WRITEMOSTLY)) printf(" writemostly");
if ((disk.state &
((1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC)|(1<<MD_DISK_REMOVED)))
== 0) {
printf(" spare");
if (is_26) {
if (disk.raid_disk < array.raid_disks && disk.raid_disk >= 0)
printf(" rebuilding");
} else if (is_rebuilding && failed) {
/* Taking a bit of a risk here, we remove the
* device from the array, and then put it back.
* If this fails, we are rebuilding
*/
int err = ioctl(fd, HOT_REMOVE_DISK, makedev(disk.major, disk.minor));
if (err == 0) ioctl(fd, HOT_ADD_DISK, makedev(disk.major, disk.minor));
if (err && errno == EBUSY)
printf(" rebuilding");
