Presentation on theme: "1 Jason Drown Mark Rodden (Redundant Array of Inexpensive Disks) RAID."— Presentation transcript:
1 Jason Drown Mark Rodden (Redundant Array of Inexpensive Disks) RAID
2 RAID Defined An array of multiple inexpensive hard disks to provide redundancy for fault tolerance and improved access/availability. Concept introduced in 1988 by Patterson, Gibson, and Katz at the University of California, Berkley.
3 Striping Multiple drives are partitioned into stripes, and concatenated together to produce one parallel storage unit Allows multiple drives to work simultaneously, transferring data in parallel
8 RAID Level 10 Combines striping and mirroring No parity One RAID 0 controller stripes two RAID 1 controllers Like RAID 1, it requires twice as many disks
9 RAID Level 0+1 Combines striping and mirroring No parity One RAID 1 controller mirrors two RAID 0 controllers Like RAID 1, it requires twice as many disks Worse failure behavior than RAID 10 Can read in parallel, unlike RAID 10
10 RAID Revisited Redundant Array of Inexpensive Disks (RAID) provides failure tolerance and improved availability Spreads data over multiple hard disks that act as one large storage unit RAID can be implemented in many ways, each with its own benefits Suitable for servers and systems where fault tolerance is necessary