pace it - storage devices (part 1)

Storage devices I.

Instructor, PACE-IT Program – Edmonds Community College

Areas of Expertise Industry Certifications

PC Hardware

Network Administration

IT Project Management

Network Design

User Training

IT Troubleshooting

Qualifications Summary

Education

M.B.A., IT Management, Western Governor’s University

B.S., IT Security, Western Governor’s University

Entrepreneur, executive leader, and proven manger with 10+ years of experience turning complex issues into efficient and effective solutions.

Strengths include developing and mentoring diverse workforces, improving processes, analyzing business needs and creating the solutions required— with a focus on technology.

Brian K. Ferrill, M.B.A.

Storage devices I.

– Types of storage devices

– SCSI

– RAID

PACE-IT.

Types of storage devices.Storage devices I.

Types of storage devices.

– Traditional internal hard disk drives.

» The spinning platter type of hard disk.» PATA = Parallel AT Attachment Interface.» SATA = Serial AT Attachment Interface.

– Non-traditional internal hard disk drives.

» SSD = Solid State Drive.» SCSI = Small Computer System Interface.» RAID = Redundant Array of Inexpensive Disks.

– Floppy disk drives.» 8” floppy: first commercial disk drive, but it is now

obsolete.» 5.25” floppy: followed the 8” drive and was very

common in the early PC market, but it too is now obsolete.

» 3.5” floppy: most successful of the floppy disk drives. They are not very common now but it is still possible to find them in the workplace. Had a maximum capacity (in most cases) of 1.44 MB.

Storage devices I.


– CD-ROM (Compact Disk – Read Only Memory).

» Commonly uses the PATA or SATA interface.» Has a maximum capacity of 700 MB.» Originally CDs could only be read from not written

to.» A CD-RW is a combo drive (aka a CD burner); allows

for writing to the CD.

– DVD-ROM (Digital Video Disk – Read Only Memory).

» Has a maximum capacity of 4.7 GB, or 8.5 GB for a dual-layer.

» DVD-RW: a combo drive that allows for writing to the DVD.

– BD-R (Blu-ray Disk – Read)» The common internal interface is SATA.» Has a maximum capacity of 25 GB to 128 GB.» BD-RE: a combo drive that can write and erase

data.

Storage devices I.


– External storage devices.» As a general rule, all of the internal storage

devices are available for an external connection. The only difference is that the interface tends to be different.

– Common external connections.» USB = Universal Serial Bus.» FireWire.» eSATA = External Serial AT Attachment.

– Ethernet storage.» NAS = Network Attached Storage.» SAN = Storage Attached Network.» Cloud storage solutions.

Storage devices I.

SCSI.Storage devices I.

SCSI.

– Small Computer System Interface (SCSI).

» SCSI is pronounced “scuzzy” and it was standardized in 1986.

» SCSI was not very popular in the home market due to the cost of SCSI devices and the management of those devices.

» SCSI was very popular in the enterprise market because the devices were very robust and could be easily (fairly easily) chained together. When chained, the last device needed to be terminated in order to stop signal bounce.

» SCSI’s longevity has lead to different versions being on the market.

» Most, but not all, SCSI devices were “hot swappable,” meaning that the system didn’t need to be shut down in order for a defective device to be replaced and a new one added in.

– Main types of SCSI.» Narrow = 8 total components (1 controller and 7

devices).» Wide = 16 total components (1 controller and 15

devices).

Storage devices I.

RAID.Storage devices I.

RAID.

– Redundant Array of Inexpensive Disks (RAID).

» RAID is taking multiple disks or storage volumes and combining them to achieve performance gains, or fault tolerance, or performance gains and fault tolerance.

– RAID 0 (stripe set).» Requires a minimum of two volumes: data is striped

between the drives (write a block of data to one volume, write the next block to the other).

» Offers the best performance out of all of the RAID types (in most situations).

» It is not fault tolerant; if one drive fails, the whole set is ruined.

– RAID 1 (mirror set).» Requires a minimum of two volumes: data is mirrored

between the drives (the system writes each block of data at least twice).

» Offers extremely fast read times, but it is slow to write.

» It is fault tolerant; if one drive fails, the data is still safe.

Storage devices I.

RAID.

– RAID 5 (striping with parity).» Requires a minimum of three volumes: stripes

data across two drives and adds a parity block to the third drive in a rotating manner.

» The parity block adds fault tolerance to the RAID. If any one disk fails, the data on it can be rebuilt by combining the data on the other two disks with the parity blocks.

» Not as fast as RAID 0, but offers better performance than RAID 1 while still providing fault tolerance.

– RAID 10 (stripe of mirrors)» A.K.A. RAID 1 + 0.» Requires a minimum of four volumes: a mirror set

is also striped.» Next to RAID 0, offers the best performance while

offering a high degree of fault tolerance.

Storage devices I.

What was covered.Storage devices I.

Storage devices include hard disk drives, solid state drives, floppy drives, and optical media. The common internal interfaces are PATA and SATA. Common external connections include: USB, FireWire, eSATA, SCSI (not so much anymore), and Ethernet solutions.

Topic

Types of devices.

Summary

Small Computer System Interface. Was a popular enterprise solution because the devices could be chained together, “hot swapped,” and tended to be more robust than other solutions. Narrow SCSI allows for a total of eight devices, while Wide SCSI allows for 15 total devices.

SCSI.

RAID can add performance, or fault tolerance, or performance and fault tolerance. RAID 0 is a striped set. RAID 1 is a mirror set. RAID 5 is a stripe with parity. RAID 10 (RAID 1 + 0) is a stripe of mirrors. RAID 0 offers the best performance but no fault tolerance. RAID 10 is popular because of the performance gains and fault tolerance.

RAID.

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