Xserve RAID Card
The Xserve RAID Card delivers enhanced storage performance and data protection through a powerful hardware RAID engine, 256MB of cache, and an integrated 72-hour battery for protecting cache data. The card requires Mac OS X Server v10.5 or later and replaces the built-in SATA/SAS controller board in your Xserve (late 2006 or early 2008).
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Enhance storage performance and data protection by configuring your system with the Xserve RAID Card and multiple SAS or SATA hard drives. The Xserve RAID Card replaces the built-in SATA/SAS controller board and does not use a PCI Express slot. Please note that your Xserve must have either all SATA or all SAS drives in drive bays 1 through 3.
Coupled with two or more hard drives, the Xserve RAID Card offers improved performance and data protection to your Xserve system — up to 318MB/s in RAID 0 and 198MB/s in RAID 5 of sequential read performance. This hardware RAID option supports RAID levels 0, 1, 5, and Enhanced JBOD and has 256MB of cache. It features an integrated 72-hour battery backup for protecting the RAID cache. The card replaces the built-in SATA/SAS controller and does not use a PCI Express slot.
To enable your Xserve for hardware RAID, install the Xserve RAID card and two or more drives of the same type in bays 1 through 3. Each RAID level has minimum requirements for the number of hard drives:
| RAID Level | Drive Requirements | Benefit |
|---|---|---|
| Enhanced JBOD | One drive | Single boot drive |
| RAID 0 (striping) | Two or three hard drives | Maximum performance and capacity for the most demanding I/O requirements |
| RAID 1 (mirroring) | Two hard drives | Maximum protection for critical data |
| RAID 5 | Three hard drives | Protection and performance; ability to survive a single disk failure; efficient capacity utilization |
The Xserve RAID Card supports the creation of multiple RAID sets in a system and multiple volumes per RAID set. For optimal disk utilization in a RAID set, all hard drives should be the same size and must be the same type (SATA or SAS). Using Apple's RAID Utility software (included with Mac OS X Server v10.5), you can migrate the boot drive into a RAID set without reinstalling or reformatting the drive, and you can customize your RAID volumes to meet your exact requirements.
System Requirements
- Requires Xserve (Late 2006) or Xserve (Early 2008)
