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Server+ - SK0-005 > 1.0 Server Hardware Installation and Management > Flashcards

1.0 Server Hardware Installation and Management Flashcards

1
Q

What is racking?

A

The process of installing rack systems and then populating the rack systems with rack-mounted devices such as routers, switches, servers, intrusion detection system (IDS) devices, and many other types of network gear.

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2
Q

The space a rack provides is referred to as?

A

Enclosure size

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3
Q

What does U in for example 1U, 2U stand for?

A

Rack Unit

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4
Q

What is the standard size of 1 unit?

A

1.75 Inches (44.45 mm) high

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5
Q

Unit refers to?

A

A variety of devices that fit in a rack system.

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6
Q

Rack slots can also be referred to as?

A

Bays

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7
Q

What is a rail kit?

A

a mechanism for sliding the server out of the rack.

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8
Q

What are the benefits of using rack systems?

A
  1. Gets equipment off the floor
  2. More efficient use of server room space
  3. Better air circulation
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9
Q

What dimension does a rack unit (U) refer to?

A

Height of a unit. One unit is 1.75 inches high

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10
Q

What two width do racks often come in?

A

19 inches and 23 inches

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11
Q

What are four standard rack unit sizes?

A

1U, Very small appliances and servers
2U, , Middle of most common size
3U, Not a common
4U, Common by size for servers

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12
Q

Before cooling management planning can begin what condition should first be satisfied?

A

When all power considerations have been satisfied, your attention should turn to ensuring that the servers do not overheat.

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13
Q

What are the main considerations to think about when it comes to airflow?

A

Proper airflow must be maintained in and around the racks. Any obstructions must be adequately managed.

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14
Q

What are two common mistakes when using fans for airflow?

A
  1. Placing intake and exhaust to close to each other.
  2. Installing panels or components in the path of airflow.
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15
Q

How is heat often extracted directly from devices?

A

Heatsinks

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16
Q

How is heat often extracted from rack?

A

Fans

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17
Q

How is heat often extracted form space around racks?

A

Airflow - circulation or elimination

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18
Q

What is one method for circulating airflow and what is the goal of using this method?

A

Hot aisle/Cold aisle method, the goal of using this method is to conserve energy and lower cost of cooling by maintaining airflow.

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19
Q

What is the purpose of using baffles and shrouds?

A

To direct and alter airflow in and out of racks.

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20
Q

How are fans used in server case?

A

Can be put directly on heatsinks to assist with removing heat from a specific component or place in or on the case to remove hot air from the case.

21
Q

What are included in proper lifting technique?

A
  1. Lift from your legs not your back
  2. Be careful not to twist, keep weight on your center line.
  3. Keep object as close to the body as possible and at waist height
  4. Push not pull
22
Q

What is rack balancing?

A

Ensure that racks are stabilized so they do not fall over. This can be accomplished by using a rack stabilizer.

23
Q

What should be consider when assessing floor load limitations?

A

Ensure that the floor has the ability to support the weight of the equipment, racks also floor tiles if used.

24
Q

What is load capacity in regard to floor load limitations?

A

The total load a floor can handle. In areas that are earthquake prion, this too must be taken in to consideration when calculating load capacity.

25
Q

What is a PDU?

A

Power Distribution Unit

26
Q

How are PDU’s rated?

A

According to the amount of power load they can handle.

27
Q

What standard does the National Electric Code place on the use of PDUs?

A

The continuous current drawn from a branch circuit not exceed 80 percent of the circuit’s maximum rating

28
Q

What are some features available on PDUs?

A

Multiple Inlets
Power conditioning (evening out sags and surges)
Surge protection
Environmental monitoring
Case alarms

29
Q

What is a KVM?

A

Keyboard, video, mouse - is a component that is used to connect one keyboard, video and mouse to multiple devices, usually servers and give the the ability to switch between devices. Can be rack mounted.

30
Q

What is a serial device server?

A

a component that provides a number of serial ports, which are then connected to the serial ports of other equipment, such as servers, routers, or switches. The consoles of the connected devices can then be accessed by connecting to the console server over a serial link such as a modem, or over a network with terminal emulator software such as Telnet or SSH, maintaining survivable connectivity that allows remote users to log in the various consoles without being physically nearby. This arrangement also allows for access “out of band”.

31
Q

What does “out of band” mean?

A

Being able to access devices even when the network is down.

32
Q

What is voltage?

A

The pressure or force of electricity

33
Q

What is amperage?

A

The amount of electricity

34
Q

What is wattage?

A

A measurement of the amount of work electricity does per second.

Wattage = amp x volts

35
Q

What are two power delivery systems available today?

A

Single phase and Three phase

36
Q

What is single phase power?

A

Single-phase power refers to a two-wire alternating current (AC) power circuit. Typically there is one power wire and one neutral wire. In the United States, 120V, in some countries, 230V is the standard single-phase voltage.

37
Q

What is three phase power?

A

Refers to three-wire AC power circuits. Typically there are three (phase A, phase B, phase C) power wires (120 degrees out of phase with one another) and one neutral wire.

38
Q

What are some common voltages?

A

Single Phase - 110V, 220V, 48V (DC)

Three Phase - 120V/208V, 277/480V

39
Q

What are some total consumption of power estimates for servers?

A

1U rack mount x86: 300 W–350 W

2U rack mount, 2-socket x86: 350 W–400 W

4U rack mount, 4-socket x86: average 600 W, heavy configurations, 1000 W

Blades: average chassis uses 4500 W; divide by number of blades per chassis (example: 14 per chassis, so about 320 per blade server)

40
Q

What is PUE and how is it used?

A

Power usage effectiveness (PUE): used to measure the efficiency of the datacenter. It describes the relationship between the amount of power used by the entire datacenter and the power used by the server only. The lower the PUE value the better.

power used by the entire datacenter / power used by the server only = PUE

41
Q

What are two methods for suppling redundant power?

A
  • Parallel redundancy, or the N+1 option, describes an architecture where there is always a single extra UPS available (that’s the +1) and the N simply indicates the total number of UPSs required for the datacenter. Because the system runs in two feeds and there is only one redundant UPS, this system can still suffer failures.
  • 2N redundancy means the datacenter provides double the power it requires. This ensures that the system is fully redundant.
42
Q

What does redundant power refer to?

A

Deploying redundant power sources to maintain constant power and/or using redundant power supplies directly on the devices.

43
Q

What is critical power?

A

Power needed to run all devices

44
Q

How to calculate critical load?

A

(Total wattage of all devices / 1000) + Room for growth = kW load level of anticipated critical load

*If device does not have Watts labeled: (Amp x Volts) .67 = Actual Watts

45
Q

What does UPS mean and what is its function?

A

Uninterruptible Power Supply (UPS): A power supply component with a built in battery designed to provide only short-term power to the systems; that is a length of time sufficient to allow someone to gracefully shut down the devices

46
Q

In relation to UPS, what is runtime?

A

The amount of TIME that the UPS can provide power at a given power level

47
Q

In relation to UPS, what is capacity?

A

The maximum amount of POWER the UPS can supply at any moment in time

48
Q

What are two methods enterprise-level UPS can automate gracefully shut down?

A

Via special NIC on UPS or dedicated UPS connected via serial or USB.

Both would work along with provided software of UPS, which may also give the ability to run scripts prior to shut down.

Server+ - SK0-005 (5 decks)

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