Every database file, log file, checkpoint file inwards MS Exchange Server comprise of a A-KB file header. This file header accommodates its configuration as well as identification knowledge. Except for log file headers, the remaining information specifically database *.edb together with checkpoint *.chk headers are continually up to date whereas regular operations.
Besides these file headers, there's yet one more header often known as 'shadow header' that's similar to main header, mendacity subsequent to it. As the identify suggests, this shadow header safeguards the first header whereas numerous updates. All the modifications are first of all made to shadow header web page previous to main header.
Therefore, if one way or the other a crash happens earlier than the modifications similar write operations might end, the first header nonetheless stays intact. Shadow header acts similar a air current defend to main header. But some elements tin forestall the write functioning to live carried out to database information, ensuing into an Exchange Server error. To resolve the difficulty, you might have to restore the un-mountable database utilizing ESEUTIL restore utility. You may also go for protected choice that's to make use of Exchange Disaster Recovery software program.
While mounting or utilizing an Exchange database .EDB chances are you'll encounter the next error message saying,
"Unable to put in writing a shadowed header for the file"
This specific error is marked with occasion 439 inwards software occasion log.
Reasons behind this error
The in a higher place error suggests an entry-denied situation. This is as a result of the shadow web page is the primary header web page that's up to date. At this level, the database service stops to be able to protect database integrity. The Exchange database engine is denied to put in writing knowledge to its personal .EDB or .CHK information on account of one of many attainable causes:
The file is inwards employment past one other course of. In this instance, you often acquire -1032 error.
The root folder permissions have got been eliminated.
The file is learn-solely. It usually happens with *.chk information.
The drive can't be accessed due to disk or controller failure.
The root folder of information has been both deleted or renamed.
You should examine the under talked about steps in order that the error could possibly be averted.
Check the appliance as well as scheme log for disk capability points in addition to resolve them
Restart the Exchange computer systems
Check for adequate disks' entry
If database is operating, transfer its mailboxes to a different server utilizing Move Mailbox command
If the database can't mount, think about one of many strategies:
Restore from backup
Run eseutil /p together with isinteg -repair instructions to restore the database. Use ExMerge to a brand new database
Repair corrupt database .EDB file utilizing Exchange Disaster Recovery software
One is relaxation assured if he/she makes use of Exchange catastrophe restoration computer program as a result of it's competent sufficient to deal with the higher up talked about error.