Dell D24M, Service Manual

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3. RAID 5 (Striping with Parity):
In this RAID level, data is stripped into blocks and spread across three or more storage devices. Each block contains the
data and a parity for fault tolerance. In an event of a drive failure, the parity helps build the lost piece of data. To further
enhance the write performance, IRST uses Volume Write-Back Cache and Coalescer. The Volume Write-Back allows writes
to be buffered, and Coalescer allows multiple write requests to be combined to reduce the overhead on parity calculation.
4. RAID 10 (Striping and Mirroring)):
RAID 10 is created, mirroring (RAID 1) the stripped (RAID 0) array. This RAID level uses four or more storage devices. It has
great reliability like a RAID 1 and performance like a RAID 0.
RAID-ready
A RAID-Ready configuration allows migration from one non-RAID SATA drive to a SATA RAID configuration.
NOTE: A reinstall of the operating system is not required for the migration.
A RAID-Ready computer must meet the following requirements:
● Supported Intel Chipsets
● One Serial ATA (SATA) hard drive
● RAID controller enabled in the computer setup
● BIOS that includes the IRST option ROM
12 Technology and components