The Xserve features next-generation hot-pluggable Serial ATA Apple Drive Modules and offers three hot-swap hard drive bays.
The Apple Drive Module (ADM) is a hot-pluggable hard drive in a special drive carrier module designed for easy server upgradeability and maintenance. This 160GB Apple Serial ATA Drive Module operates at 7200 rpm and is equipped with 16MB of disk cache. Serial ATA Apple Drive Modules are 24x7 server-class rated and are ideal for applications needing capacity and great storage value with excellent performance.
Using up to three drive modules, the Xserve can be configured from 160GB to 3TB of internal storage. Unpopulated bays ship with a blank drive carrier which can be replaced with a drive module at any time even if the server is running so its easy to add storage capacity as your server needs grow.
Software and Hardware RAID options
Mac OS X Server includes AppleRAID, providing RAID 0 and 1 support through software, allowing you to increase either data redundancy or performance. Xserve features on-line rebuilding of RAID 1 volumes and is able to boot from RAID volumes. Choose any combination of mirroring or striping across the three drive bays. RAID configurations require a minimum of two ADM hard drives. For increased protection and performance, add the Xserve RAID card to your Xserve, which provides hardware RAID 0, 1, and 5 with 512MB of cache and a 72-hour cache battery backup.