20vcs6unixstartandfail Trans

7/24/2019 20vcs6unixstartandfail Trans

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Veritas Cluster Server 6.0 for UNIX:Cluster Management

Lesson 3: Startup and Failover Policies


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Lesson 1: Service Group Dependencies

Lesson 2: Reconfguring Cluster Me!ers"ip

Lesson 3: Startup and Failover Policies

Lesson #: $lternate %et&or' Confgurations

Lesson (: )ig" $vaila!ilit* in t"e +nterprise

Lesson introduction


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$,ter copleting t"is topic0 *ou&ill !e a!le to descri!e rules andpolicies controlling service groupstartup-

Startu rules

and olicies


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((

$ules for automatic service grou startu

ccurs &"en "astart is eecuted-

Service group attri!utes ust !e set:

$utoStart 1 4de,ault5

%onept* $utoStartList

%ot Fro6en $ll s*stes in S*steList &it" G$7 e!ers"ip 4port

a5 ust !e up and running-

$ll resources ust !e pro!ed on s*stes in

S*steList &it" G$7 e!ers"ip- Service group dependencies to c"ild service groups

ust !e et-


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Startu s%stem selection

9"e initial set o, candidate s*stes is derived ,ro t"e$utoStartList attri!ute-

9"e target s*ste is t"en selected !ased on t"e startup polic* o,

t"e service group-

1

1

1

2

1

3

S*stes are eliinated i,:

9"e* are ,ro6en-

9"e service group "as a F$/L9+D status-

9"e* do not eet service group re.uireents-


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&utomatic startu olicies

&utoStart'olic%attri"ute values

S%stem selection "asis

rder

rdered listed0 le,t to rig"t0 in$utoStartList

4de,ault5

Priorit* Lo&est priorit* nu!er in S*steList

Load Greatest availa!le capacit*

hagrp modify dbsg AutoStartPolicy Priority


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;;

&utoStart'olic%(!rder

s1s2

s3$

C

C

$

7

7

Group A (

SystemList = { s1=2, s2=1, s3=0 }

AutoStartList = { s1, s2, s3 }

)

Group C (

SystemList = { s1=3, s2=1, s3=2 }


)

Group B (

SystemList = { s1=0, s2=1 }

AutoStartList = { s2, s1 }

)

9"e frst availa!le s*ste

in $utoStartList is selected-

AutoStartPolicy=r!erisde,ault-


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==

&utoStart'olic%('riorit%

S1S2

S3$

C

C

$

7

Group A (

SystemList = { S1=2, S2=1, S3=0 }

AutoStartList = { S1, S2, S3 }

AutoStartPolicy = Priority

)

Group C (

SystemList = { S1=1, S2=2, S3=3 }

AutoStartList = { S3, S1, S2 }


)

Group B (

SystemList = { S1=0, S2=1 }

AutoStartList = { S2, S1 }


)

9"e lo&est>nu!ereds*ste in S*steList t"atis also in $utoStartList isselected-

7


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&utoStart'olic%(Load

C

Group C (SystemList = { s1=1, s2=2, s3=3 }


AutoStartPolicy = Loa!

Loa! = "#

)

s1s2

C$

7

9"e s*ste &it" t"e

greatest$vaila!leCapacit* isselected-

s3

Capacit*

@ Load

$vaila!leCapacit*

3??

1(?

1(?

2??

(

12(

1??

1??

7e,ore C starts0 s2 "as$vaila!leCapacit* 2??


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$,ter copleting t"is topic0 *ou&ill !e a!le to descri!e rules andpolicies controlling service group,ailover-

)ailover rules

and olicies


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$ules for automatic service grou failover

9"e service group ust "ave a critical resource

4Critical15-

9"ese service group attri!utes ust !e set to de,aultvalues:

$utoFailver 1

ManageFaults $LL

9"e service group cannot !e ,ro6en-

$t least one s*ste in t"e service groupAs S*steListattri!ute ust !e up and running-


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)ailover s%stem selection

9"e initial set o, candidate s*stes is derived ,ro t"eS*steList attri!ute-

9"e target s*ste is t"en selected !ased on t"e ,ailover polic* o,

t"e service group-

11

12

13

S*stes are eliinated i,:

9"e* are ,ro6en-

9"e service group "as a F$/L9+D status-

9"e* do not eet service group re.uireents-


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1#1#

)ailover olicies

)ail!ver'olic% &ttri"uteValues

S%stem Selection *asis

Priorit*Lo&est priorit* nu!er in S*steList

4de,ault5

RoundRo!inLeast nu!er o, active servicegroups

Load Greatest availa!le capacit*

hagrp modify dbsg FailOverPolicy RoundRobin


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1(1(

)ail!ver'olic%('riorit%

s1s2 s3

C

C

$

7

Group C (

SystemList = { s3=0, s1=1, s2=2 }


)

9"e lo&est> nu!ereds*ste in S*steList is

selected-

c

$ail%erPolicy=Priorityisde,ault-


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)ail!ver'olic%(Load

s1s2 s3

C

C

$

7

Group C (SystemList = { s3=0, s1=1, s2=2, s=3 }

AutoStartList = { s3, s1, s2, s }

$ail%erPolicy = Loa!

Loa! = "#

)

9"e s*ste &it" t"e

greatest$vaila!leCapacit* isselected-

c

s#

D

Capacit*

@ Load

$vaila!leCapacit*

3??

(

22(

2??

(

12(

1??

2(

(

7e,ore ,ailover


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1;1;

Con+guring Load and Caacit%

hasys modify s1 Capacity 3

hagrp modify dbsg !oad "#

System s1(

Capacity = 300

* * *

)

mai'*c+

roup !s(

SystemList = { s1 = 1, s2 = 2, s3 = 3 }

* * *

Loa! = "#

)


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$,ter copleting t"is topic0 *ou&ill !e a!le to use Liits andPrere.uisites to ,urt"er controlservice group startup and ,ailover-

Limits and

'rere,uisites


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Startu e-amle

s1s2

$7

Group - (

SystemList = { s1=0, s2=1, s3=2, s=3 }


Prere.uisites = { /Bs=1 }

)

s3

Liits@ Prere.uisites

CurrentLiits

21

1

7e,ore + Starts

D7s

11

?

D7s

1

1

?

D7s

??

?

D7s

s#

C D

+

+


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)ailover e-amle

s1s2

$7

Group C (

SystemList = { s3=0, s1=1, s2=2, s=3 }


Prere.uisites = { /Bs=1 }

)

Liits are "ardversus Load&"ic" is so,t4allo&snegativevalues5-

Liits@ Prere.uisites

CurrentLiits

s#

D

+

c

s3

C

Group C cannot ,ail over

22

?

D7s

11

?

D7s

1

1

?

D7s

??

?

D7s


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Con+guring Limits and 'rere,uisites

hasys modify s1 !imits $%s &

hagrp modify dbsg Prere'uisites $%s 1

System s2(

Limits = { /Bs = 2 }

* * *

)

mai'*c+

roup !s(

* * *

Prere.uisites = { /Bs = 1 }

)


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$,ter copleting t"is topic0 *ou&ill !e a!le to odel startup and,ailover policies-

Modeling startu andfailover "eavior


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Using te Simulator

9o test startup and

,ailover policies in t"eSiulator:1- Create a ne& Siulated

cluster-

2- Cop* t"e mai'*c+fle

,ro *our cluster into t"ene& confgurationdirector*-


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Lesson summar%

Be* points

Startup and ,ailover policies provide fne>grained control o,service group startup and ,ailover-

ou can use t"e Siulator to odel !e"avior !e,ore *ouipleent policies in t"e cluster-

Re,erence aterialsVeritas Cluster Server Users Guide


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20vcs6unixstartandfail Trans