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-   -   CRC Error (http://forum.ultrabac.com/showthread.php?t=287)

Realtime 04-07-2008 05:23 AM

CRC Error
When we try do do a restore of the public folder DB we get a CRC integrity error... does this mean the backup is useless?


Derek Beaney 04-07-2008 10:57 AM


Crc errors can be tricky to diagnose as to what the cause is.

Here is a listing of the most common reasons:

1. Bad backup (run a manual verify on the backup)
2. Bad Memory (run memtest, www.memtest.org )
3. Bad Sector on hard drive (run chkdsk /r )
4. Bad network connection (do restore locally)

Can i have you post the restore log here? it may show us a different reason.


Realtime 04-08-2008 03:52 AM

I have done a verify on the backup and it passed ok.

I can't shut the machine down to do a memtest or chkdsk at the moment as there is live data on it. ( can you confirm you meant the UB server and not the Exchange server?)

Below is the log for the restore:

RESTORE LOG - BEI UltraBac UltraBac 7.1.4 - Build Date:Mar 12 2004
RESTORE started On: 07/04/2008 At: 15:25:34

Description: Full Exchange 2003 Backup
User: COMMISSION\Administrator
Agent: Exchange
Not Password Protected
Computer Name: SCCRCSRV1
Device: Tape0 (ARCHIVE Python 06408-***9100)
Starting Volume Number: 1

Error: Writting to file 'Public Folder Store' failed when agent wrote 218 instead of 65536 bytes of data.
File 'SCCRCMAIL (E2K)\First Storage Group\Public Folder Store' fails CRC integrity check

Restore Complete.
Begin: 15:25:34 End: 15:26:22 (0 h 00 m 48 s) - ( 1.33 KB/Sec 0.08 MB/Min 4.69 MB/Hour)
Media Capacity: 19.135 GB
Media Remaining: 18.365 GB
2 file(s) completed/1 file(s) selected.
64.00 KB completed/46.02 MB selected.


Many Thanks


Derek Beaney 04-08-2008 02:21 PM


Looking at the log file, i would have to say the issue is with the destination point (the exchange server). The next step would be to run check disk / memtest on the exchange server.

Realtime 04-09-2008 07:34 AM


Checked the disks and they are fine, however memtest has failed - Got some new RAM on order and will update you once I receive and install it.

Realtime 04-16-2008 06:14 AM

I have received and installed the new ram and it looks like it's faulty too or the mobo is dying.

However I was having a look through the event log on the Exchange server and found these to logs after attempting a restore

Event Type: Error
Event Source: M***changeIS
Event Category: Exchange Backup Restore
Event ID: 9635
Date: 16/04/2008
Time: 14:05:58
User: N/A
Computer: SCCRCSRV2
Failed to find a database to restore to from the Microsoft Active Directory.
Storage Group specified on the backup media is 8d3937f0-e669-416e-8eac-7907cab6a449.
Database specified on backup media is Public Folder Store, error is 0xc7fe1f42.

For more information, click http://www.microsoft.com/contentredirect.asp

And This one ...........

Event Type: Error
Event Source: ESE BACKUP
Event Category: Callback
Event ID: 904
Date: 16/04/2008
Time: 14:05:58
User: N/A
Computer: SCCRCSRV2
Information Store (2768) Callback function call ErrESECBRestoreGetDestination ended with error 0xC7FE1F42 Database not found.

For more information, click http://www.microsoft.com/contentredirect.asp.

The exchange server had exchange removed and reinstalled for this restore - am I missing step out? do I need to recreate the DB on the exchange server in a particular place with a particular name?

Realtime 04-22-2008 07:33 AM

The hardware looks OK now, the problem seems to be with the restore as per the event logs I posted.

Any ideas what this could be? Is it possible just to restore the actual database files rather than putting it back onto the server direct?


Derek Beaney 04-22-2008 07:36 AM

Hi Kenny,

The errors that you are receving can be too complex to resolve over the fourm. Can i have you call our support team at 425-644-6000 so that we may resolve this issue for you?


Realtime 04-22-2008 08:45 AM

I won't have time to call in today, however here is some more info to ponder over.


I had a look at the kb, and tried workaround 3 to no avail, so after this I tried to re-create the public store (Public Folder Store (SCCRCSRV2)) to see if this helped however it says that this object already exists. Any ideas on where this may exist so I can delete it?


Realtime 04-28-2008 07:57 AM

Do you have a UK based helpdesk that I can call?

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