Dell PowerVault MD3000 Manual de sintonización - Página 10

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Dell™ PowerVault MD3000 and MD3000i Array Tuning Best Practices

traffic virtual disks share a disk group, even with purely sequential usage models,

the disk group I/O behavior becomes increasingly random, lowering overall

performance. Additionally, when a disk group must be shared, the most heavily

trafficked virtual disk always should be located at the beginning of a disk group.

4.4 Virtual Disk Ownership

The Dell™ MDSM can be used to automatically build and view virtual disks. It

uses optimal settings to stripe the disk group. Virtual disks are assigned to

alternating RAID controllers when they are created. This default assignation

provides a simple means for load balancing the workload of the RAID controllers.

Ownership can later be modified to balance workload according to actual usage. If

virtual disk ownership is not manually balanced, it is possible for one controller to

have the majority of the work, while the other controller is idle.

Limit the number of virtual disks in a disk group. If multiple virtual disks are in a

disk group, consider the following information:

• Consider the impact each virtual disk has on other virtual disks in the

same disk group.

• Understand the patterns of usage for each virtual disk.

• Different virtual disks have higher usage at different times of day.

The choice of a segment size can have a major influence on performance in both

IOPS and data transfer rate.

The term segment size refers to the amount of data written to one drive in a

virtual disk group before writing data to the next drive in the virtual disk group. A

set of contiguous segments spanning across member drives creates a stripe. For

example, in a RAID 5, 4 + 1 virtual disk group with a segment size of 128KiB, the

December 2008 – Revision A01

Figure 1: Virtual disk ownership balance.

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