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Module 13: How Teradata uses NCR Systems

After completing this module you will !e a!le to:

"escri!e the fundamental relationship !etween #N$%

logical units and dis& array controllers'

"escri!e the fundamental relationship !etween (dis&s

)dis&s slices and *#Ns'

Specify the ma+imum dis& space that an AM) can manage'

,i-en a new dis& array and a set of configurationparameters determine the num!er of *#Ns and the si.e of

each *#N as configured !y )#T and pdeconfig'

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Teradata and the )rocessing Node

#N$% S(R/ M)0RAS or indows 2

Teradata )"4 56ase(proc7

Teradata T)A S8

)rocess Control Memory Mgmt' $89 Mgmt' 5"e-ice "ri-ers7

MemoryC)#s

)entium $(

3' ,H.

6$C/M ;

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SM) Memory and Teradata

2> of remaining space ? 2@ M6 a-aila!le to 9'S'

of remaining space ? 11B M6 a-aila!le for

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SM) Shared Memory

%ctl )arameter 0

Managed !y

)"4

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Memory Managed !y the 9perating System

Memory managed and used !y the operating system and the -procs issometimes called Ifree memoryJ' 4+amples of how this memory is used:

(procs for non0Teradata file system acti-ity

AM) wor&er tas&s

)arser and dispatcher tas&s

Messages 0 communication !etween -procs "ictionary cache

ReFuest to Steps cache

Temporary wor& space for -procs

Administrati-e programs such as: program te+t and data

message !uffers 5e+' TC)8$)7

&ernel resources

other applications 5e+'

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6uddy Node 6ac&up 5#N$% M)0RAS only7

A I!uddy nodeJ is another SM) in the same cliFue which is used to!ac&up AM) updates'

#pdates to data !loc&s and8or cylinder inde+es are written immediately

to dis& !ased on following parameters:

"ata 6loc&s only 0 "6SControl Irite"6sTo"is&J set to TR#4

"ata 6loc&s Cylinder $nde+es 0 %ctl Irite All to "is&J set to 9N

AM)

"ata 6loc&

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(proc Num!er Assignment

4ach )"4 AM) and )4 is assigned a uniFue (proc L in the system'

)"4 (proc Ls5start at 13B/ and increment !y 17

)"4 on first SM) 0 13B/

)"4 on second SM) 0 13B

)"4 on third SM) 0 13B

AM) (proc Ls5start at and increment !y 17

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(proc Num!er Assignment 4+ample

SM)10/

)"4 13B/

)413B3

AM)

AM)

/

AM)

B

AM)

12

AM)

1

AM)

2

AM)

2/)413B2

SM)10

)"4 13B

)4

13B1

AM)

1

AM)

AM)

@

AM)

13

AM)

1

AM)

21

AM)

2

)4

13B

SM)10)"4 13B

)4

13@

AM)

2

AM)

AM)

1

AM)

1/

AM)

1B

AM)

22

AM)

2)4

13B

SM)10

)"4 13B

)4

13

AM)

3

AM)

AM)

11

AM)

1

AM)

1@

AM)

23

AM)

2)4

13

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"is& Arrays from an 9'S' )erspecti-e

A logical unit 5*#N7or (olumeis a single dis& to #N$%'

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*ogical #nits and Slices

ith #N$% M)0RAS a logical unit 5*#N7 will ha-e a single #N$% partition which

is typically di-ided into multiple slices'

How are slices typically used

Hold a #N$% file system 5e'g' -+fs7'

)ro-ides raw data storage area 5raw dis& slice7 for data!ases 5e'g' Teradata7'

Slice 56oot Slice7 contains (T9C which has starting location 5physical !loc& L7 and

si.e of each slice on the dis&'

0 6oot

B 0 Raw sliceassigned

to a )dis&

Teradata

)dis& space

0 6oot

1 0 Root

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*#N and Slicing ,uidelines

4ach *S$ array has a ma+imum of 32 *#Ns or (olumes'

#N$% 3'1 and a!o-e 5currently on #N$% 3'27

Ma+imum *#N si.e 1 T6

Ma+imum slice si.e 1 T6

Teradata si.ing issues 5ma+imum space that one AM) can address7

Teradata (2 Releases 1 and 2 ? /3 ,6

51 cylinders + 1/BB sectors8cylinder + 12 !ytes8sector7

Teradata (2R3 (2R/ and indows NT ? 112 ,6

51 cylinders + 3B2 sectors8cylinder + 12 !ytes8sector7

Teradata (2R/'1 (2R' ? 1'2 T6

5 cylinders + 3B2 sectors8cylinder + 12 !ytes8sector7

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Teradata the 9'S' and "is& Arrays

"is& Array Controller

Single "is&

)4

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Teradata and a 1/ "is& Array 5*ogical (iew7

B/01/ "is& Array with "is&s 0 *ogical (iew

AM)

-proc

}

AM)

-proc

2

}

AM)

-proc

/

}

AM)

-proc

}

AM)

-proc

B

}

AM)

-proc

1

}

AM)

-proc

12

}

SM)

AM)

-proc

1

}

AM)

-proc

3

}

AM)

-proc

}

AM)

-proc

}

AM)

-proc

@

}

AM)

-proc

11

}

AM)

-proc

13

}

(dis&

(dis&

2(dis&

/

(dis&

(dis&

B

(dis&

1(dis&

12

(dis&

1

(dis&

3(dis&

(dis&

(dis&

@

(dis&

11(dis&

13

SM)

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Teradata and a 1/ "is& Array 5"etail (iew7

"AC

"AC

SM)

;

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*ogical #nits and (dis&s 4+ample

3 ,6

3 ,6

3 ,6

3 ,6

*#N

)dis&

*#N 1

)dis& 1

(dis&

)dis&

)dis& 1

AM)-proc

2 ,6 of

Ma+

)4RM

space

Assumes 3 ,6 "is&s RA$" 1

3 ,6

3 ,6

3 ,6

3 ,6

*#N 2

)dis& 2

*#N 3

)dis& 3

(dis& 1

)dis& 2

)dis& 3

AM)-proc

1

2 ,6 of

Ma+

)4RM

space

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4+ample of 2 ,6 (dis&

Assumes RA$" 1 Mirroring

(dis&

Cylinder

1

2

3

33

2 ,6

)dis& 1

)dis&

3 ,6

Cylinder

1B32

3 ,6

1B32B

33

3 ,6

"is& $"

1

3 ,6

"is& $"

2

3 ,6

"is& $"3

3 ,6

"is& $"

/

AM)

)hysical "is&s

TeradataOs

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Teradata

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)#T pdeconfig and "is& Arrays

The )#T and pdeconfig utilities are used to configure a Teradata data!ase

en-ironment'

9ne of its &ey functions is to scan a system for dis& arrays and configure

those dis& arrays for use with Teradata'

"epending on the type of array RA$" *e-el si.e and num!er of dis&s these

utilities will configure arrays differently' This chart lists configuration defaults'

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Summary

Memory managed and used !y the operating system and the -procs is

sometimes called Ifree memoryJ'

)"4 software manages

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Re-iew ;uestions

1' "escri!e the fundamental relationship !etween the 9'S' logical units and dis& array controllers'

2' "escri!e the fundamental relationship !etween (dis&s )dis&s and *#Ns or (olumes'

3' Specify the ma+imum dis& space that an AM) can manage'

Teradata (2R3 0

Teradata (2R' 0

/' ,i-en a new dis& array and the following parameters complete the following chart as configured !y

pdeconfig'

RA$" L "is& Total L Si.e of

*e-el of "is&s Si.e of *#Ns each *#N

RA$" 1 3 ,6

RA$" 1 3 ,6

RA$" / 1B ,6

RA$" 3 ,6

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Module 13: Re-iew ;uestion Answers

1' "escri!e the fundamental relationship !etween the 9'S' logical units and dis& array controllers'

Disk array controllers manage a set of logical units (implemented across a set of disks) and makethese available to the operating system.

2' "escri!e the fundamental relationship !etween (dis&s )dis&s and *#Ns or (olumes'

Each AP is assigned to a !disk "hich is made up of # or more Pdisks. A Pdisk is assigned to a

logical unit or volume (in a disk array).

3' Specify the ma+imum dis& space that an AM) can manage'

Teradata (2R3 0 ##$ %&

Teradata (2R' 0 #.$' T&

/' ,i-en a new dis& array and the following parameters complete the following chart as configured !y

pdeconfig'

RA$" L "is& Total L Si.e of

*e-el of "is&s Si.e of *#Ns each *#N

RA$" 1 3 ,6 $ '

RA$" 1 3 ,6 $ *

RA$" / 1B ,6 #+ ,-

RA$" 3 ,6 #- #+