Information Store Dismounts and Stops

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This article was previously published under Q288700

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SYMPTOMS

The information store dismounts and starts referencing "version store" errors similar to the following event:

Event ID 623

Information Store (2356) The version store for instance 0 ("ca192ae5-ad76-478e-8530-0b1756e7d28d") has reached its maximum size of 85Mb. It is likely that a long-running transaction is preventing cleanup of the version store and causing it to build up in size. Updates will be rejected until the long-running transaction has been completely committed or rolled back.
Possible long-running transaction:

SessionId: 0x111006E0
Session-context: 0x00000000
Session-context ThreadId: 0x00000B64

The Application log may also contain a series of MSexchangeIS events (#1022) and MSexchangeSA events (#9175).

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CAUSE

When the Write Disk Caching (write-back caching on the hard drive) option is enabled for performance reasons, the Exchange server may encounter a JET or information store dismount and crash.

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RESOLUTION

Restart the computer, and then disable the Write Disk Caching option. Write-back caching on a disk controller is acceptable so long as the controller has a battery backup; however, write-back caching on a physical disk can lead to JET-related issues in Exchange 2000.

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