Exchange Server can benefit from having basic disk partitions track-aligned. Diskpar.exe is used for aligning a partition at the storage level, which, if used to create the partition, can have a s...
Updated Jul 01, 2019
Version 2.0
Blog Post
Bryan Hoyt <is there a way to check w/o diskpar in diskpart after partition creation?>
When I use Diskpart to Show partition, it says the Offset is 32KB, when diskpar shows 32256. When I use diskpar or diskpart to make a proper 32768 offset, diskpar shows 32768, and diskpart still shows 32KB. Until I hear differently, I always doublecheck with diskpar on volumes I'm not sure of. On volumes I used DISKPART.EXE to create with a 32KB offset, I am confident they are correct.
Jackie - <KB read/write to stm/log. What should Allocation Unit Size be for those and the Backup Lun>
Jackie, it is Exchange best practice to keep the STM/EDB on the same LUN. The STM size varies but averages about 8kb in production. The log writes vary in size from 512b to the log buffer size. You will want to make sure that the starting offset is multiple of 4kb. Most vendors want 32kb, some 64kb. As for Allocation Unit Size, we have always recommended the default, 4kb.
When I use Diskpart to Show partition, it says the Offset is 32KB, when diskpar shows 32256. When I use diskpar or diskpart to make a proper 32768 offset, diskpar shows 32768, and diskpart still shows 32KB. Until I hear differently, I always doublecheck with diskpar on volumes I'm not sure of. On volumes I used DISKPART.EXE to create with a 32KB offset, I am confident they are correct.
Jackie - <KB read/write to stm/log. What should Allocation Unit Size be for those and the Backup Lun>
Jackie, it is Exchange best practice to keep the STM/EDB on the same LUN. The STM size varies but averages about 8kb in production. The log writes vary in size from 512b to the log buffer size. You will want to make sure that the starting offset is multiple of 4kb. Most vendors want 32kb, some 64kb. As for Allocation Unit Size, we have always recommended the default, 4kb.