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Chapter 6:

Chapter 6:. 22540 - Computer Arch. & Org. (2). Disk Storage. I/O Connection. Interrupts. Processor. Cache. Memory I/O Interconnect. Main Memory. I/O Controller. I/O Controller. I/O Controller. I/O Devices. Network. Disk. Disk. Magnetic Disk. Nonvolatile Tracks & Sectors

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Chapter 6:

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  1. Chapter 6: 22540 - Computer Arch. & Org. (2) Disk Storage

  2. I/O Connection Interrupts Processor Cache Memory I/O Interconnect MainMemory I/OController I/OController I/OController I/ODevices Network Disk Disk

  3. Magnetic Disk • Nonvolatile • Tracks & Sectors • Recorded Information • Sector Number, Gap, Data, ECC, Gap, Next Sector Num. • Rotational Latency • 5400 RPM  (½ rotation / 5400) = 5.6 ms • Transfer Time • Sector: ≈ 100 MB/s • Cache: ≈ 375 MB/s = 3 Gbps SATA-2

  4. Disk Interface • Advanced Technology Attachment • SATA (Serial) • Small Computer Systems Interface • SCSI (Parallel) • SAS (Serial Attached SCSI)

  5. Flash Storage • Semiconductor • Non Volatile (EEPROM) • Faster, Smaller and Lower Power • Higher Cost • Block R/W • Wearout (10,000 ~ 100,000 Writes per Cell) • Wear Leveling (Remap Blocks) • Solid State Disk (SSD) • Hybrid Hard Disk

  6. Busses • Processor-Memory Bus • Short, High Speed and Matched Width • I/O Bus • Can be Lengthy and Connect Many Types • Often Have a Wide Range Bandwidth

  7. I/O Transaction • Two Parts • Sending Memory Address • Sending or Receiving Data • Synchronous • All Devices on the Bus Run on the Same Clock Rate • Clock Skew Limits Length • Asynchronous • External: Firewire, USB, etc. • Internal: PCI Express, SATA, etc. • Handshaking

  8. Parallelism & I/O • Redundant Array of Inexpensive Disks (RAID) • RAID 0 Striping BLK 0 BLK 2 BLK 4 BLK 6 BLK 1 BLK 3 BLK 5 BLK 7

  9. Parallelism & I/O • Redundant Array of Inexpensive Disks (RAID) • RAID 0 Striping • RAID 1 Mirroring BLK 0 BLK 1 BLK 2 BLK 3 BLK 0 BLK 1 BLK 2 BLK 3

  10. Parallelism & I/O • Redundant Array of Inexpensive Disks (RAID) • RAID 0 Striping • RAID 1 Mirroring • RAID 2 Error Detection & Correction Code Bit 0 Bit 2 Bit 4 Bit 6 Bit 1 Bit 3 Bit 5 Bit 7 Parity Parity Parity Parity

  11. Parallelism & I/O • Redundant Array of Inexpensive Disks (RAID) • RAID 0 Striping • RAID 1 Mirroring • RAID 2 Error Detection & Correction Code • RAID 3 Bit-Interleaved Parity Byte 0 Byte 2 Byte 4 Byte 6 Byte 1 Byte 3 Byte 5 Byte 7 Parity Parity Parity Parity

  12. Parallelism & I/O • Redundant Array of Inexpensive Disks (RAID) • RAID 0 Striping • RAID 1 Mirroring • RAID 2 Error Detection & Correction Code • RAID 3 Bit-Interleaved Parity • RAID 4 Block-Interleaved Parity BLK 0 BLK 2 BLK 4 BLK 6 BLK 1 BLK 3 BLK 5 BLK 7 Parity Parity Parity Parity

  13. Parallelism & I/O • Redundant Array of Inexpensive Disks (RAID) • RAID 0 Striping • RAID 1 Mirroring • RAID 2 Error Detection & Correction Code • RAID 3 Bit-Interleaved Parity • RAID 4 Block-InterleavedParity • RAID 5 Distributed Block- Interleaved Parity BLK 0 BLK 2 Parity BLK 6 BLK 1 Parity BLK 4 BLK 7 Parity BLK 3 BLK 5 Parity

  14. Chapter 6 The End

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