I want to understand and if it makes sense, disable the alert message I receive about spares missing on my ubuntu linux software raid 5.
I used mdadm and set up a /dev/md0 raid volume made up of 3 hard drives.
I then set up email alerts so I can see when there is a problem with it.
I often get these 'spare missing' alerts, and I assume that means there is a second spare defined and I do not have one.
I am looking to clarify that this is actually not really a problem, and that I can change a setting to tell mdadm I do not have a second spare (I have only 3 drives). My system should continue running if 1 drive goes down?
Here is the alert message:
This is an automatically generated mail message from mdadm running on myserver A SparesMissing event had been detected on md device /dev/md0. Faithfully yours, etc. P.S. The /proc/mdstat file currently contains the following: Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid5 sdc1 sdb1 sdd1 1953519488 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU] unused devices: <none>