Exchange 2007 GRT-enabled backups to disk or GRT restores from tape fail due to disk geometry incompatibility

Article:TECH209092  |  Created: 2013-07-29  |  Updated: 2013-11-20  |  Article URL http://www.symantec.com/docs/TECH209092
Article Type
Technical Solution


Issue



Utilizing Advanced Format Disks having a 4KB physical sector size can result in a disk geometry error during Exchange 2007 database recovery.   Advanced Format disks report themselves as having a 4KB physical sector size, but emulate a logical addressing interface of 512 bytes for backward compatibility. These disks are also known as “512-byte emulation disks” or “512e” for short.


Error



The volume that is used for the staging location must be a writable NTFS volume that is local to the Backup Exec server. Also, the volume must not be shared through Distributed File System.


Cause



Utilizing Advanced Format Disks having a 4KB physical sector size can result in a disk geometry error during Exchange 2007 database recovery.   Advanced Format disks report themselves as having a 4KB physical sector size, but emulate a logical addressing interface of 512 bytes for backward compatibility. These disks are also known as “512-byte emulation disks” or “512e” for short.
The 4KB physical sector size does not become an application problem until the operating system exposes this capability. Exchange 2007 requires Windows Server 2008 R2 HF982018 in order to detect the available 4KB sector size. This HF facilitates Advanced Format Disks reporting of the 4KB sector size to interested applications.
Similarly, virtualization of either the Exchange 2007 or the Backup Exec server on a Windows Server 2012 Hyper-V host will present a 4KB logical sector size on the new VHDX format drives by default. This will have the same impact as Windows Server 2008 R2 HF 982018.
During Backup Exec GRT-enabled disk backups or GRT restores from tape of an Exchange 2007 database, this problem will occur if:
  • The Exchange 2007 log volume resides on an Advanced Format Disk with HF 982018 installed and the Backup Exec server recovery volume resides on a standard 512-byte sector drive.
  • The Backup Exec server recovery volume resides on an Advanced Format Disk with HF 982018 installed and the Exchange 2007 log volume resides on a standard 512-byte sector drive.
  • Both the Backup Exec server recovery and Exchange 2007 log volumes reside on Advanced Format Disks, but Windows Server 2008 HF 982018 is only installed on one server or the other.

Solution



Align the disk geometry of the Exchange 2007 log volume with the recovery/staging volume on the Backup Exec server. This can be accomplished by:

  •  Ensuring both volumes are Advanced Format Disks and either are, or are not reporting the 4KB physical sector size. The following Windows Server 2008 command can be used to determine this:
fsutil fsinfo ntfsinfo <local NTFS volume>
Example 1: Advanced Format Disk with HF 982018 reporting 4KB physical sector size
Example 2: Standard disk with HF 982018 reporting 512-byte logical and physical sector size
  • Use standard 512-byte disk drives on both the Exchange 2007 log volume and recovery/staging volume on the Backup Exec server.

 




Article URL http://www.symantec.com/docs/TECH209092


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