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How can i monitor when a storage group or a mailbox store gets dismounted

we have an exchange cluster , and sometimes we find the mailmox stores dismounted. Once i check the event viewer though there is no record of such ab event. Is there any way i can see in the event viewer events related to the mailbox store ?

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There really should be events logged in the Application Log where the source is either MSExchangeIS or ESE. And especially if the store is dismounted because of some problem (out of disk space, too many transaction logs, ...)

Which version of Exchange?
Do you perform regular on-line full Information store backups?
Is only one storage group affected or several/all storage groups?
How about the public stores, do they dismount?

How many people have administrative access to that server, that are able to dismount stores?
c_hocklandAuthor Commented:
1. exchange 2003
2. regular backups = daily
3. only the storage group i ran Perfect Disk on (defrag)
4. There 8 admins with full exchange rights

No EVENTS on any of the logs

any ideas?
After a bit of searching there seem to be no major problems with Perfectdisk that cause the store to dismount automatically, but I have no experience with the product.

Is there any chance that, by running a defrag on the drive or store, that the system has created some sort of scheduled defrag task that dismounts the store whenever it pleases?
Also check if the online maintenance and online backup schedules are over-lapping. I have experienced issues with this. It also dismounts the stores or crashes the Information Store service.

Amit Aggarwal.
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