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Mass Storage System

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Submitted By anne1995
Words 365
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MASS-STORAGE SYSTEM
ROMERO, MHICA ANGEL M .

OUTLINE
Overview of Mass Storage Structure
Disk Structure
Disk Attachment
Disk Scheduling
Disk Management
Swap-Space Management
RAID Structure
Stable-Storage Implementation

OBJECTIVES
Describe the physical structure of secondary and tertiary storage devices and the resulting effects on the uses of the devices
Explain the performance characteristics of mass-storage devices
Discuss operating-system services provided for mass storage

Magnetic Tapes

Magnetic Disks

Solid State Disks

» Magnetic tape
˃ Was early secondary-storage medium
˃ Relatively permanent and holds large quantities of data
˃ Access time slow
˃ Random access ~1000 times slower than disk
˃ Mainly used for backup, storage of infrequently-used data, transfer medium between systems
˃ Kept in spool and wound or rewound past read-write head
˃ Once data under head, transfer rates comparable to disk
˃ 20-200GB typical storage
˃ Common technologies are 4mm, 8mm, 19mm, LTO-2 and
SDLT

» Magnetic disks provide bulk of secondary storage of modern computers ˃ Drives rotate at 60 to 200 times per second
˃ Transfer rate is rate at which data flow between drive and computer ˃ Positioning time (random-access time) is time to move disk arm to desired cylinder (seek time) and time for desired sector to rotate under the disk head (rotational latency)
˃ Head crash results from disk head making contact with the disk surface
» Drive attached to computer via I/O bus
˃ Busses vary, including EIDE, ATA, SATA, USB, SCSI
˃ Host controller in computer uses bus to talk to disk controller built into drive or storage array

» Solid State Disks are nonvolatile memory that is used like a hard drive.

Disk Structure

Disk Structure
 Disk drives are addressed as large 1-dimensional arrays of logical blocks, where the logical block is the smallest unit of transfer.
 The 1-dimensional array of logical blocks is mapped into the sectors of the disk sequentially.
* Sector 0 is the first sector of the first track on the outermost cylinder.
* Mapping proceeds in order through that track, then the rest of the tracks in that cylinder, and then through the rest of the cylinders from outermost to innermost. Disk Structure

Disk Attachment: Host-Attached Storage









Disk Attachment: Network-Attached Storage





Disk Attachment: Storage Area Network

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