HP StorageWorks Enterprise Virtual Array Cluster FIO Starter Kit Guida Utente Scaricare il pdf (Pagina 24)

2. Partition alignment:

• Align partition with diskpart.exe for Windows 2000 or 2003, non SP1:

a. Download diskpart.exe from the Windows 2000 kit and place the executable file

in the Windows system path.

b. Click Disk Management, and in the lower right hand side pane, note the disk number of

drive to be partitioned.

c. Open a command prompt and type diskpart –s for disk number.

d. Answer y to both questions for yes.

e. Enter 128 for starting offset (128 = 64K).

f. Insert desired partition size in MB.

g. Assign drive letter to partition and format it using Disk Management.

• Align partition with diskpart for Windows 2003 SP1 & R2:

a. Diskpart.exe is available on Windows 2003, however only the diskpart in Windows

2003 SP1 and higher can align disks.

b. Open command prompt and type diskpart.exe.

c. Press Enter and type list disk.

d. Note the disk number on which you want to create a partition.

e. Press Enter and type select disk 1 (or other disk number).

f. Press Enter and type create partition primary align =64.

g. At the new prompt, type assign letter z (or other letter drive) or type assign mount

C:\Folder1 (or other path of empty directory to mount the drive).

h. Press Enter and type exit to leave diskpart.

i. Format the new drive using Disk Manager.

3. This section describes how to configure Windows Server 2003 disk partitions to be aligned

optimally for HP storage. The Windows Server 2003 default partition set does not align the

partition to the physical disk on which the partition resides. Correct partition alignment helps

reduce latency when the partition is written to, because it eliminates the unnecessary disk writes

and reads that occur when partitions are not aligned. Windows partitions should be aligned at

64K for best results.

4. With a physical disk that maintains 64 sectors per track, Microsoft Windows always creates the

partition starting at the 64th sector—which misaligns it with the underlying physical disk. To be

certain of disk alignment, use diskpart.exe, a disk partition tool. Provided by Microsoft in

the Windows Server 2003 Service Pack 1 support tools, diskpart.exe can explicitly set the

starting offset in the master boot record (MBR). Setting the starting offset correctly will align

Microsoft Exchange I/O with storage track boundaries and improve disk performance. Microsoft

Exchange Server 2007 writes data in multiples of 8 KB I/O operations, and I/O operation to a

database can be from 8 KB to 1 MB. Therefore, make sure that the starting offset is a multiple

of 8 KB. Failure to do so may cause a single I/O operation to span two tracks, causing

performance degradation.

NOTE:

This can only be done when creating a new partition before formatting. It is not possible to

align a partition that has data on it already without losing that data.

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HP StorageWorks Enterprise Virtual Array Cluster FIO Starter Kit Guida Utente Pagina 24

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