RAID state in trigger

[stettler]

Hello,
If the purpose is to fire the trigger when there is a problem with the RAID, you can't use the "clean" or "active" state : An array can be in degraded mode (have a faulty disk) and in "clean" or "active" state at the same time.

If the goal is the fire the trigger when a disk fail, you should use something like :
{#MD_DEVICE} RAID status degraded
{Template MD RAID:mdraid[{#MD_DEVICE},e,"State"].regexp("(degraded|failed)")}=1&{Template MD RAID:mdraid[{#MD_DEVICE},e,"State"].regexp("(resyncing|recovering)")}=0

I don't think that there is a "failed" state but I put it just in case...
I would also add another trigger with "information" severity to know when an array is rebuilding :
{#MD_DEVICE} RAID status building
{Template MD RAID:mdraid[{#MD_DEVICE},e,"State"].regexp("(resyncing|recovering)")}=1

Cheers!

[MichaKersloot]

I altered the templace to:
{Template MD RAID:mdraid[{#MD_DEVICE},e,"State"].regexp("(^clean$|^active$)")}=0

[linuxsquad]

Sorry, I failed to update this module... here is my latest attempt to handle it the failed state and it works:

{Template MD RAID:mdraid[{#MD_DEVICE},e,"State"].regexp("(degraded)")}=1 | {Template MD RAID:mdraid[{#MD_DEVICE},e,"State"].strlen(0)}<5

[stettler]

Why the "strlen(0)<5" part ?
I think this is enough : {Template MD RAID:mdraid[{#MD_DEVICE},e,"State"].regexp("(degraded)")}=1

Personally, I prefer the expression I first wrote (with the resyncing/recovering part) : Once the problem was acted upon and the array is rebuilding, I prefer not to have the trigger anymore. But fire-up another trigger with a lower severity to inform that the array is currently being rebuilt.

[linuxsquad]

Why the "strlen(0)<5" part ?
Error on safe side.. just in case my script spew some random characters

Agreed, your script does provide more status granularity, however I was more concern with catching failing mdraid when I wrote it initially. Since we had very small md partitions on high-perf SSD, (resyncing|recovering) phase flew really fast... almost unnoticeable. Otherwise, it is a welcome addition.