32. Sisteme de salvare a datelor. Benzile QIC si DAt. Functionare, avantaje, dezavantaje Flashcards

1
Q

Ce reprezinta sistemele de salvare a datelor?

A

constau intr-un asamblu de echipamente speciale, cu ajutorul carora datele dispuse sub forma digitala sunt salvate pe anumite medii de stocare in cazul unor incendii, atacuri informatice, erori hardware/umane, etc

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2
Q

Ce sunt benzile QIC? (quarter inch cartridge)

A

benzi magnetice folosite pentru stocarea datelor

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3
Q

Ce tipuri de scriere are QIC?

A

longitudinala

elicoidala

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4
Q

Ce caracteristici au benzile QIC?

A

2 capete citire si un cap de scriere
datele se memoreaza pe suprafata magentica prin magnetizare (variere)
viteza mare de inaintare a benzii

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5
Q

Ce sunt benzile DAT? (digital audio tape)

A

mediu de stocare sub forma unei benzi magnetice, pentru stocarea datelor si redarea datelor

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6
Q

Ce caracteristici are DAT?

A

bazat pe un cilindru infasurat de banda iclinata

viteza mica de inaintare a benzii

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7
Q

Care este dezavantajul DAT?

A

parte mecanica complexa, greu de intretinut si costisitoare

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8
Q

Ce presupune salvarea pe banda?

A

salvare, arhivare si restaurare date
alegere fisiere si mod de salvare
interval dintr 2 salvari si modul de stocare

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9
Q

Care sunt tipurile de salvare pe banda?

A

full

partial

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10
Q

Care sunt tipurile de back-up?

A

incremental

diferential

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11
Q

In ce consta back-up-ul incremental?

A

ultimele fisiere adaugta sau modificate de la o salvare totala sau partiala

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12
Q

Care sunt avantajele back-up-ului incremental?

A

rapid (fisere putine)

necesita mai putine casete (spatiu cauta redus)

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13
Q

Care sunt dezavantajele back-up-ului incremental?

A

restaurarea lenta a datelor

cost mare de downtime in caz dezastru

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14
Q

In ce consta back-up-ul diferential?

A

ultimele fisiere adaugtae sau modificate de la utilma salvare totala

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15
Q

Care sunt avantajele back-up-ului diferential?

A

restaurare rapida

cost redus de downtime

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16
Q

Care sunt dezavantajele back-up-ului diferential?

A

viteza redusa

necesita multe casete