431 4.3.1 STOREDRV mailbox disk is full

Question

I discovered that messages were stuck in the queues and clients were storming with complaints, checking further I discovered the error.. 431 4.3.1 STOREDRV; mailbox disk is full. Then checking on the exchange console, mailbox04 database, copy status showed
failed and dismounted from MBX02. Since we are using hyper-v, increasing the hard disk space via hyper-v management console for MBX02 fixed the issue but I would like to know is there a way I can get alerts before hand or to monitor it daily in case of similar
issue in future so it can be discovered on time because this happened during working hours and it came unexpected so clients were so pissed.

Answer 1

We have a daily process that pulls the database size, the number of logs, and the free space on the log and database drives.  We use that for determining our database growth.  You can implement the same sort of thing simply by running the following
as a scheduled process:
$MbxDbs = Get-MailboxDatabase -Status
$MbxSrvrDrvs = Get-MailboxServer | Sort Name | % { Get-WmiObject -Class win32_volume -ComputerName $_.Name }
$AllData = $MbxDbs + $MbxSrvrDrvs | ConvertTo-Html
SendMailMessage -From <an email address> -To <your email address> -BodyAsHtml -Body $AllData -SmtpServer <your hub server> -Subject "Daily Database Status Report"
This will give you the raw data - you will need to clean it up for review.  You can also modify the data returned by the above commands so you get more user friendly data, but it would take me too long to throw something together for that here. 
The script we use gives us a view at the high level, as well as the deep dive data necessary for determining why an anomaly might have happened.