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Exchange and Backup Exec error message... possible corrupt store

Posted on 2007-11-20
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Hello all... We have an Exchange 2003 SP2 server on a Windows 2003 SP1 box.  We use Veritas Backup Exec 9.1 to backup the server.  I recently noticed our backups were failing and were getting this error in Backup Exec:

Backup - \\server\Microsoft Information Store\First Storage Group Access denied to database Mailbox Store (server).
Database or database element is corrupt
Access denied to database VIP Mailbox Store.
Database or database element is corrupt

I did find this Veritas KB article but don't think it applies to us.  http://seer.entsupport.symantec.com/docs/265159.htm

In addition to the above error in Backup Exec.. we are getting this error in the application log when a backup runs:

Event Type:      Error
Event Source:      ESE
Event Category:      Logging/Recovery
Event ID:      474
Date:            11/20/2007
Time:            6:10:29 AM
User:            N/A
Computer:      server
Description:
Information Store (2560) First Storage Group: The database page read from the file "F:\Exchsrvr\mdbdata\VIP Mailbox Store.edb" at offset 18970136576 (0x000000046ab55000) (database page 4631380 (0x46AB54)) for 4096 (0x00001000) bytes failed verification due to a page checksum mismatch.  The expected checksum was 6865773602588631989 (0x5f4820b7128ca3b5) and the actual checksum was 1757556576004030283 (0x18641864d95f3f4b).  The read operation will fail with error -1018 (0xfffffc06).  If this condition persists then please restore the database from a previous backup.  This problem is likely due to faulty hardware. Please contact your hardware vendor for further assistance diagnosing the problem.


There are multiple errors like the one above, referencing two out of our four stores.   I have read this KB article from Microsoft.  http://support.microsoft.com/kb/314917/


So my question is, do you think I have two corrupt stores?  If so, what is the best way to deal with them while having minimal downtime for my users?  Can I move all my users from the corrupt stores to a working store(assuming most mailboxes will move) then run an offline defrag?  My last good backup was from Thursday, and I have all transaction log files since then.    

Thanks
David

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Question by:sdcox
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vishal_breed earned 500 total points
ID: 20320610
You have 2 options.

1> Follow the mentioned article http://support.microsoft.com/kb/314917/ (consider the down time if database size is huge).

Now Regarding Option 2 - This would be more lengthy but will resolve issue permanantly because I have seen using eseutil/isinteg never resolves such issues - it will reoccure again (may be in 2-6 months or year). It would be better of you check BIOS version of Mother Board; RAID controller; HDD & also media test of HDD. Such hardware issues also cause Exchange Database corruption.

2> Sicne you have 4 stores in First Storage Group; it is Enterprise Version.

a. Create New storage group & two new Stores & move all the mailboxes to new stores.
b. The page which is bad in Database (part of somebody's mailbox); will not allow moving concerned mailbox to new store.
c. Confiure Outlook for that user & export that mailbox to PST (Outlook - File - Export).
d. delete this mailbox & create new mailbox for such user on new store.
e. after moving all the mailboxes to new server - run Online Backup on new stoarge group - make sure it runs completly. as well    
f. delete those stores corrupt stores from Exchange System Manager as well as EDB & STM.
g. Run Online Backup on First Storage Group - to comlete the backup & also to purge the log files created because of Move Mailbox.
h. Create new stores in First Storage Groups & create mailboxes on same. Sent some emails & then try running Online Backup on First Storage Group.
g. Now depends on you whether to keep those moved users in Second Storage Group or bring them back to First (keeping on second will avoid move mailbox, deletion etc.)
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by:sdcox
ID: 20320721
So you suggest creating a second Storage Group instead of moving the mailboxes into an exiting store?  Is there any considerations I need to take into account when creating a second storage group?  

Thanks
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Author Comment

by:sdcox
ID: 20320734
ETA:  I.E. Should I put my transaction logs in a different folder... should I put the system path location on the same disk as my first storage group?
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Expert Comment

by:vishal_breed
ID: 20320745
1. Second storage Group should be on New drive (if First Storage Group is sharing same drive for Log Files & database files).
2. It should not have any hardware errors.
3. While move mailbox lot of transaction logs files are created - make sure they do not fill both drives!!

All the best!!
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Author Comment

by:sdcox
ID: 20320777
My first storage group is not sharing a drive for log files and db files, they are on separate drives.  Unfortunately I don't have any other drives big enough to sore my database... will Exchange let me create another storage group on the same disk as the first one?  I was thinking I would put my second storage group log files on the same drive as my first storage group log files, and my second storage group db on the same drive as the first storage group db.  

How does that sound?  
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Expert Comment

by:vishal_breed
ID: 20320995
Fine. Keep the dabases (of Second SG) in Dababases drive & log files (of Second SG) in log files drive.
But make sure there are no issues with HDD Media, BIOS version of Mother Board  & RAID controller.
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Author Comment

by:sdcox
ID: 20321078
Yah i may run a disk check scan later... but my main concern is the stores right now.  We have had this Exchange server for 4-5 years now with no problem.  The last update I did was Exchange SP2 a while back(backups working during the time) so that is why Im hesitant to say its firmware or a driver issue.  Thanks for your help, i'll post back how it went.  
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Author Comment

by:sdcox
ID: 20331082
We also have this error in our event log...

Event Type:      Warning
Event Source:      MSExchangeIS Mailbox Store
Event Category:      General
Event ID:      1025
Date:            11/21/2007
Time:            3:08:04 PM
User:            N/A
Computer:      server
Description:
An error occurred on database "First Storage Group\Mailbox Store (NEWMAN)".
 Function name or description of problem: SLINK::EcUpdate
Error: Read verification error


Does this error reinforce the idea that my store is corrupt?  Does it change what I need to do any?  

David
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Expert Comment

by:vishal_breed
ID: 20333301
This issue may occur if a database page is corrupted. This may cause the Microsoft Joint Engine Technology (JET) database engine to stop responding. (http://support.microsoft.com/kb/329817/en-us)
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