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This is the default setting if cluster mode is enabled. In Write-through caching, the controller sends a data transfer completion signal to the host when the disk subsystem has received all This setting is recommended in standard mode. In Write-back caching, the controller sends a data transfer completion signal to the host when the controller cache has received all The default is Write-through for PERC 4/SC and Write-back for PERC 4/DC. You can set the write policy to Write-back or Write Policy specifies the cache write policy. However, if you are sure that your computer does random read requests more often, select a small stripe size. The default is 64 MB for PERC 4/SC and PERC 4/DC.Ī larger stripe size provides better read performance, especially if your computerĭoes mostly sequential reads. You can set the stripe size to 2 KB, 4 KB, 8 KB, 16 KB, 32 KB, 64 KB, or 128 KB. Stripe Size specifies the size of the segments written to each drive in a RAID 1, 5, or 10 logical drive. RAID 50 requires at least six physical drives. RAID 10 requires at least four physical drives. RAID 5 requires at least three physical drives. RAID 1 requires exactly two physical drives. RAID 0 requires one or more physical drives. The number of physical drives in a specific array determines the RAID levels that can be implemented with the array. Table 5-1 Logical Drive Parameters and Descriptions Parameter Table 5-1 contains descriptions of the logical drive parameters.

NOTE: In Cluster mode, PERC 4/DC allows only write-through as the write policy. This section describes the logical drive parameters and default settings for PERC 4/SC and PERC 4/DC and provides procedures for the configuration

Define logical drives using the space in the arrays.

Designate hard drives as hot spares (optional).

See Selecting a Configuration Method in this section for more information.

Select a configuration method to create arrays using the available physical drives.

Perform the following steps to configure arrays and logical drives: If you do not press within a few seconds of the prompt, the system continues the boot procedure.Īfter you press, the Management Menu screen displays. Press to Enable BIOS Configuration Utilityįor each PERC controller in the host system, the firmware version, dynamic random access memory (DRAM) size, and the status of logical drives on that controller display. HA -0 (Bus 1 Dev 6) Type: PERC 4 Standard FW x.xx SDRAM=128MBĠ Logical Drives found on the Host AdapterĪdapter BIOS Disabled, No Logical Drives handled by BIOS When the host system boots, hold the key and press the key when the following appears:

Verify that the redundancy data in logical drives using RAID level 1 or 5 is correct.

Access controllers, logical drives, and, physical drives individually.

Configure physical arrays and logical drives.

This section describes the procedures used to perform the following:

The BIOS Configuration Utility is a character-based utility than you can run by pressing when the system boots. Is independent of the operating systems on your computer. Because the utility resides in the PERC 4 BIOS, its operation The BIOS Configuration Utility configures disk arrays and logical drives. Starting the PERC 4 BIOS Configuration Utility PERC 4 BIOS Configuration Utility: Dell PowerEdge Expandable RAID Controller 4/SC and 4/DC User's Guideīack to Contents Page PERC 4 BIOS Configuration Utilityĭell PowerEdge Expandable RAID Controller 4/SC and 4/DC User's Guide