Avago Technologies MegaRAID SCSI 320-0 (520-0 CH) - Manual (Page 21)

Features 1-5
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Advanced array configuration and management utilities
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Online RAID level migration
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No reboot necessary after expansion
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Support for hard drives with capacities greater than 8 Gbytes
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More than 200 Qtags per array
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User-specified rebuild rate
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Hardware clustering support on the board
Note: The MegaRAID 320-2, -2E, -2X, and -4X Storage Adapters
support clustering; the MegaRAID 320-1 Storage Adapter
does not. See
Chapter 4, “Installing and Configuring
Clusters” for more information about clustering.
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Wide Ultra320 LVD SCSI performance up to 320 Mbytes/s
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Support for up to 14 SCSI drives per channel on storage system with
SAF-TE enclosures (SCSI accessed fault-tolerant enclosures),
15 SCSI drives per channel for other configurations
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32 Kbyte NVRAM for storing RAID system configuration information;
the MegaRAID 320 firmware is stored in Flash ROM for easy upgrade
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Battery backup for MegaRAID 320-2, -2E, -2X, and -4X
Note: Battery backup is available for the MegaRAID 320-1, 320-2,
320-2E, 320-2X, and 320-4X controllers, either through an
onboard battery or daughter card. You can purchase the
controller with the battery backup unit (BBU) or purchase
the BBU separately.
1.2.4 Drive Roaming
Drive roaming occurs when the hard drives are moved within a
configuration on the controller. When the drives are moved, the controller
detects the RAID configuration from the configuration information on the
drives. Configuration information is saved in both nonvolatile random
access memory (NVRAM) on the MegaRAID controller and on the hard
drives attached to the controller. This maintains the integrity of the data
on each drive, even if the drives have changed their target ID.
Important: Before performing drive roaming, make sure to power off
both your platform and your drive enclosure.