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Archive for 31. March 2008
Using Diskpart to Align a Windows Disk Partition
31. March 2008 by Bennett.
There is an EMC whitepaper titled Using diskpar and diskpart to align partitions on Windows Basic and Dynamic Disks. This paper describes how legacy Windows issues cause a single disk I/O to span multiple tracks. This puts an unnecessary load on the SAN and reduces performance. The fix is to align the partition. Below is a sample session using the DISKPART utility. Comments are in red.
Invoke Diskpart
C:\>diskpart
Microsoft DiskPart version 5.2.3790.3959
Copyright (C) 1999-2001 Microsoft Corporation.
On computer: MYTESTBOX
You must select the disk to act on
DISKPART> select disk 5
Disk 5 is now the selected disk.
Create a partition using the EMC-recommended alignment offset
DISKPART> create partition primary align=64
DiskPart succeeded in creating the specified partition.
Select the partition / volume that you just created
DISKPART> select volume=0
Volume 0 is the selected volume.
Assign a drive letter
DISKPART> assign letter=o
DiskPart successfully assigned the drive letter or mount point.
Exit Diskpart
DISKPART> exit
Leaving DiskPart…
C:\>
You can now use the disk management MMC to format the partition
Posted in Windows OS, Performance | Print | 6 Comments »