Dell MD3600I, MD3620I owner manual Choosing an Appropriate Physical Disk Type, 117

The corresponding dynamic cache read prefetch setting and segment size values that are typically well suited for the selected virtual disk I/O characteristic type are populated in the Dynamic cache read prefetch and Segment size fields.

NOTE: If you selected the Custom option, select your preferred dynamic cache read prefetch setting (enabled/disabled) and segment size (8 KB to

512KB).

2 Click OK.

Choosing an Appropriate Physical Disk Type

You can create disk groups and virtual disks in the storage array. You must select the capacity that you want to allocate for the virtual disk from either unconfigured capacity or free capacity available in the storage array. Then you define basic and optional advanced parameters for the virtual disk.

With the advent of different physical disk technologies, it is now possible to mix physical disks with different media types and different interface types within a single storage array. In this release of MDSM, the following media types are supported:

•Hard physical disk

•Solid State Disk (SSD)

Physical Disk Security with Self Encrypting Disk

Self Encrypting Disk (SED) technology prevents unauthorized access to the data on a physical disk that is physically removed from the storage array. The storage array has a security key. Self encrypting disks provide access to data only through an array that has the correct security key.

The self encrypting disk or a security capable physical disk encrypts data during writes and decrypts data during reads. For more information, see the PowerVault Modular Disk Storage Manager online help topics.

You can create a secure disk group from security capable physical disks. When you create a secure disk group from security capable physical disks, the physical disks in that disk group become security enabled. When a security capable physical disk has been security enabled, the physical disk requires the correct security key from a RAID controller module to read or write the data.

Configuration: Disk Groups and Virtual Disks

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