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tipathing cal Notes

ents

5 ............ 6

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10 .......... 11

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14 .......... 15

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3

4

Contents

EMC VPLEX HImplementat


Sol

V

V

V

thing g and Best Pr

aris ..............

VPLEX and M

VPLEX and M

VPLEX with O

ractices Tech

....................

MultiPath soft

MPxIO ............

Oracle Solaris

nical Notes

....................

tware ...........

....................

s Cluster sup

....................

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pport .............

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.......... 37

.......... 37

.......... 39

.......... 40

This

Aud

Doc

Hos

s chapter pre

dience .........

cument Orga

st Multipath

Imp

esents the fo

....................

nization ......

for VPLEX Ov

plementation

llowing topic

....................

....................

verview ........

n Planning an

Chapte

cs:

...................

...................

...................

C


er 1 In

....................

....................

....................

Chapter 1: Intr


ntroduc

...................

...................

...................

roduction

tipathing cal Notes

ction

........... 6

........... 6

........... 7

5

6

A

Chapter 1: Int


Audience

Documen

roduction


e

Thewilltech

nt Organ

ThisImpdocper

All d

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thing g and Best Pr

ese technical be configurihnical notes

SAN techn

Fiber Chan

VPLEX con

ization

s technical nplementationcument that h-topic inform

documents a

e following lisde available:

EMC VPLE

EMC VPLE

EMC VPLE

EMC VPLE

EMC VPLE

EMC VPLE

EMC VPLE

EMC VPLE

EMC VPLE

ractices Tech

notes are foing, installing requires an u

nology and n

nnel block st

ncepts and c

ote is one ofn Planning an had previousmation that w

are available

st represents:

EX Overview a

EX SAN Conne

EX Host Multi

EX IP Network

EX and Recov

EX Data Mobi

EX REST API

EX Upgrades

EX Virtual Edi

nical Notes

r EMC field pg, and suppo understandin

etwork desig

torage conce

omponents

f a set of docnd Best Practsly been avaiill be easier t

on http://su

s the technica

and General

ectivity

pathing

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verPoint Inter

lity and Migr

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personnel anorting VPLEX.ng of the foll

gn

epts

uments that tices for EMClable. It is in

to maintain a

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al note best p

Best Practice

roperability

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d partners an. An understaowing:

supersede t VPLEX Techntended to pr

and keep up-

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practice docu

es

nd customeranding of the

he monolithinical Notes rovide more c-to-date.

uments that

s who ese

ic

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will be

Host Mu

ltipath fo

ThisVPL

Theand

Chaoveocc

Pleareq

ImppurpModarch

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or VPLEX

s document iLEX.

e recommendd rigorous tes

anges to softwerall environmasionally.

ase refer to tuirements fo

ortant VPLEX pose of multipdel. Additionahitecture.

e Distributed ependent caforms a readd miss. An a

mpensate for en connectedimized.

o as mentions is completeancing and p

st as active/aive/passive o the devices aides is active

Imp

Overview

is designed t

dations and rsting through

ware and hament cause th

he ESSM (EMor multipath s

uses a Distribpath configuraally, from a ho

Cache Modeche. This me against that

array with Glo these differed to VPLEX fro

ned, VPLEX isely independpath access factive. This m or ALUA conf accessed thre/passive or A

plementation

w

to address ho

requirementsh E-Lab, QE a

rdware archihese recomm

MC Simple Su support state

uted Cache Mations than most perspective

el is designedeans that if at write from aobal Cache wences, the hoom an array s

s an active/acent from the

for the backemeans that thfiguration setrough VPLEX ALUA.

n Planning an

ost multipath

s are based ond the VPLEX

tecture both mendations a

upport Matrixements.

Model which is ost arrays whice, VPLEX is vie

d so that eaca host writes another Direc

would result iost multipath so that the c

ctive architec backend arr

end array andhere is absolttings within even if the b

C


h configurati

on general SAX Performanc

within VPLEX and requirem

x) for recomm

significantly dch typically us

ewed as an act

ch VPLEX Dire to one Direcctor then the s a cache rea

h configuratiohance of a ca

cture from thray. VPLEX wd will presentlutely no con the host mu

backend array

Chapter 1: Intr


ons as they a

AN best practce Engineerin

X and withinments to be a

mendations a

different for thse a Global Cative/active

ector has its otor and then result is a caad hit. To on setting wiache read hit

he host perspwill handle tht the device tsideration foltipath configy where that

roduction

tipathing cal Notes

apply to

tices ng Team.

the djusted

and

he ache

own ache

ill differ t can be

pective. e load

to the or guration device

7

8

S

Chapter 1: Int


Multipath Software

roduction


Thebro

1

2

Pat

Patfailomodwriton Vthe

WhfewassaddsamcomconconClusdictVPLavafor the to bacti

Loa

Loapatban

Baschodiff

1

2

3

Patleveimppro

thing g and Best Pr

ere are severaken down int

. Path Fai

. Load Ba

h Failover

h Failover is over access odel as it has tten and read VPLEX then itre will be a 1

ile this may bw disadvantag

ign the activditional work me responsivmpared to loanfiguration canfiguration whsters in a Metate that the LEX Cluster wailable failove all hosts whi administrato

be redone whive paths aga

ad Balancing

ad Balancing hs by utilizin

ndwidth avai

sed on the spoices for confferent catego

. Path Pol

. How mu

. Path tim

h Policy is a el. The Path portant to refduct or settin

ractices Tech

al choices whto two basic

lover

alancing

designed as only. This de the highest pd from the sat will be on th00% chance

be a distinct ges. First, the path to the for the admi

veness and aad balancingalled “Host Chere the hos

etro Configura active path b

were to fail ther paths wouich would ovor to try and hen the originain on the loc

software is dng additionallable to mov

pecific load bfiguration setries:

licy - i.e. Rou

uch I/O is sen

meouts and re

setting withi Policies varyference the Eng.

nical Notes

hen selecting categories:

single activeesign has adv possible chaame VPLEX Dihat one Direc

e of a cache r

advantage wis type of con

e least utilizeinistrator. Sedaptability in

g software. Thross-Cluster t has accessation across

be defined toen there wou

uld be to the serwhelm tha rebalance thnal VPLEX Clucal cluster.

designed to t resources toe larger amo

balancing softtings. In bas

nd Robin, Ad

nt before mov

etries

n the multipay from softwaSSM (EMC Si

g the host mu

e path and thvantages wit

ance of a cachirector for thactor that the

read hit.

when considenfiguration re

ed VPLEX Direecond, this tyn the event ohird, VPLEX o Connect Con to the devic data centerso the local VPuld be a high same Directot director an

he active pathuster came b

take advantao move data.unts of data

ftware chosesic terms, th

daptive…

ving on to ne

ath software are vendor toimple Suppo

ultipath softw

he other avaith the VPLEX he read hit. at host and i active path i

ering performequires manector and maype of softwa

of various env offers a very nfiguration”. ce across twos. The initial PLEX Cluster possibility t

or on the remd create a sehs. All this w

back online to

age of the add. This increas faster.

en, there are tese settings

ext path

and is confi software ven

ort Matrix) be

ware. These

lable paths a Distributed C

All data will f the data is is configured

mance, there ual configura

ay create a loare may not hvironment fa unique type This is a

o different VP configuratio however if th

that the first mote VPLEX Cerious worklowork would tho rebalance t

ditional avaises the total

typically seve fall into a few

gured at the ndor and is

efore committ

can be

are for Cache be in cache

d to and

are a ation to t of

have the ilures as

of

PLEX n would

he local

luster oad for hen have the

lable

eral w

host

ting to a

Mosthe cha

As mandalgo

NotdatthirPowava

Spe

st products a datacenter.

allenges for h

mentioned wd requires muorithms whic

t all host mulacenter may

rd party softwwerPath has aailable with a

ecific recomm

Imp

available tod VPLEX offers

host access.

with the Path ultipath softwch differ from

ltipath softwa offer the opt

ware but ther added additiny other prod

mendations a

plementation

ay were desis additional c

Failover software to be co most arrays

are is createdtion of selectre will be circional supportduct on the m

and settings w

n Planning an

igned to prov capabilities a

tware, VPLEX onfigured to os.

d equal. Basting host bas

cumstances wrt specifically market.

will be discu

C


vide multiple and therefor

uses a Distr optimize the

sic configuratsed native mu where we recy for VPLEX M

ussed in the f

Chapter 1: Intr


e path accesse additional

ributed Cache VPLEX cachi

tions within tultipath solu

commend PowMetro which is

following cha

roduction

tipathing cal Notes

s within

e model ing

the utions or werPath. s not

apters.

9

10

Chapter 2: ESX


Xi NMP Policy


This

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Cha

Add

thing g and Best Pr

s chapter pre

und Robin - N

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ditional Infor

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esents the fo

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llowing topic

ecommendat

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obin - NeThisand

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The recomMetro (nothe defau

For VPrecom

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change the dvista) devices

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Imp

y Recommvides the recoavailability wit

mmended mun-cross-connlt setting of 1

PLEX Metro crmmended.

owerPath/VESXi host to auver the remotuster will be

PLEX Cluster

or more informee the suppoage:https://sMware

al backgroundss-connect e

d-robin path extra read anhly half of theont-end host e-coherency t

path policy rhosts and all dful of hostsreds of hosts

dition, shouldpath chosen bble that multse the same nnual re-balan when the oldagain.

ed Path t

default policys, complete t

e vSphere CL

following co

plementation

mendatioommendationth EMC® VPL

ultipathing senect), and VP1000.

ross-connect

5.8 includesutomatically te cluster. Th the active pa will be the st

mation on Port support.emc.

d: There are tenvironments

policy for a hnd write latene I/O will be traffic will be

traffic will be

requires a lot volumes on and only a f

s and thousan

d the single p by a host migtiple hosts co new remote dncing of paths cluster is ba

to Round

y setting from the following

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etting is RounPLEX Geo. The

t with VMwar

s the auto-st prefer to sene host pathsaths whereastandby paths

owerPath/VE

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two problems:

host connectncy for I/O op local and hae consumed. sent betwee

t of manual a both cluster

few volumes nds of volum

preferred patght be at the ould by the lu director and s would be re

ack online, th

Robin

m Fixed to Rog steps:

nded) or the

Chap


to achieve op

nd Robin for e I/O Limit va

re, PowerPath

andby featurnd I/O to its ls connected ts those conns.

E and the auto

cts/1800_Po

s with using

ted to both Vperations to tlf will be rem Additional V

en clusters.

administrativrs to prefer th this might b

mes this is too

th fail for wh remote clustuck of the dra thus overloaequired at thhe exercise h

und Robin fo

service cons

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timal perform

VPLEX Localalue should b

h/VE is highl

re which allo local VPLEX c to the local Vnected to the

o-standby fe

owerPath-VE-

NMP for VPL

PLEX clusters the remote c

mote. WAN baVPLEX inter-c

ve work to haheir local cluse acceptableo onerous.

atever reasoter. And it's eaw unfortuna

ad that one dhe new clustehas to be repe

or EMC VPLEX

sole.

MP Policy

1tipathing cal Notes

mance

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ly

ws each cluster VPLEX remote

ature,

for-

LEX

s will cluster. andwidth luster

ave all ster. For e. But for

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er, and eated all

X

11

12

A

Chapter 2: ESX


Addition

Xi NMP Policy


1

2

al Inform

For VMw

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– For ES

# esxcl

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– For ES

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– For ES

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mation

information ware Compat

http://wwwoductid=12nterval=10

For relatanging the dehttp://kb.vmwa

ractices Tech

SXi 5.x:

li storage

MW_SATP_IN

SXi/ESX 4.x:

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following co

SXi 5.x:

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=device_NA

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on VMware atibility Guide

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ted informatiofault pathing are.com/kb/10

nical Notes

e nmp satp

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AA

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13

14

Chapter 3: Pow


werPath


This

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ures include:

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sight capabilng I/O proble

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ath managemEX, on severa

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VPLEX Virtua

s, a switch, Vsable as a sins the Initiatoe HBA, Storag

ample, Fibre A port on the sd, bus is the to a host's enaths traverse

ce, enabling P

ailure. Powerer path.

distributes I improving I/O eliminating th

formance — P host. Havingen if a specifie I/O workloa

rPath charactlaky paths or

s per path

down a path

on I/O througds (powermt s) provide this

Chapter 3: Po


ment. PowerPal operating

d I/O paths.

al Volume or

VPLEX interfangle storage r- Target-LUNge Port and L

Channel fabr server on on Initiator-Targnd-to-end sto a single bus

PowerPath to

rPath automa

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PowerPath sug multiple patic path is ad to a given

terizes I/O par unexpected

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owerPath


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Chapter 4: Na


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Chapter 4: Na


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Chapter 4: Na


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Chapter 4: Na


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Chapter 4: Na


tive MPIO


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tive MPIO


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37

38

Chapter 4: Na


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ractices Tech

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ddladm lists

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e state typ

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h = c2t5000i@1e,600000h = c4t5000i@1e,600000

PORTANT

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ginning with Sacle Solaris h

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For Solaris

SRU 5

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14888

14208

15011

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er the READMse patches.

abling MPxIO

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pled with the Ve future VPLEX able.

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s S10u11 (1/

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ME file that ca

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e parameter

driver/drv/fp

u11 OS

e parameter

el/drv/fp.con

set the follow

rv/scsi_vhci.

nce="round-

plementation

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VPLEX SCSI pe releases, then

S11.1, you cge VPLEX dev

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ame with you

ed, complete

mpxio_disab

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mpxio_disab

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n Planning an

bled(a) - FC0,0 - 50:00abled - FC c0,0 - 50:00

ersonality. If thn there should

can use the Mvices.

llowing patc

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ur SRU or pat

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xio-disable="

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eter in the file

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here is any chd be a corresp

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Chapter 4: Nat


01:ca:10 -

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39

40

VSs

Chapter 4: Na


VPLEX with OSolaris Clustsupport

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ere is a limiteltipathing.

PORTANT

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sr/cluster/b

ractices Tech

ack="enable

booting from

booting from

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les MPxIO an that you will change to M

e the stmsbo

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only includes or SC3.3, SC

atches.

cluster with ltion, Campus

cluster with n

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MPxIO name

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f Solaris Clus

ftware that ca

VPLEX and MP

Solaris 10 1C3.3 5/11 (u

ocal VPLEX cs Cluster is n

no more than

sed by the cl

ust be a VPLEe used.

he SCSI-2 re

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_fencing pro

cess Mode’ m

efault_fencinvices.

ent setting of nd:

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l disk:, reboo

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e appropriate reboot after M after the reb

d, the system

ster with VPLE

n be used with

PxIO the follo

/13 (S10u111) with the la

configurationnot supported

n two (2) nod

uster must n

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servation.

following set

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must be ‘scs

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l ’

ot the host.

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des.

not have mor

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tting (to mak

to ‘pathcount

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to ‘global’ fo

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your system bled since yo

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ng MPxIO as

ter and VPLEX

tions must b

olaris Cluste core patch a

uster over Mee.)

e than two ac

ed storage de

ke sure they a

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r the quorum

erty, use the

host:

file our boot

MPxIO is

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be strictly

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ccess

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are using

m device

‘ /u

or:

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sr/cluster/b

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‘ /usr/clust

‘/usr/cluste change the ‘d

sr/cluster/bin/ s the device’

After settimust be m

Make comm

‘ /usr/c

If the done

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b. Cha‘glo

c. Reporig

Imp

ange the currhe following c

in/cluster se

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ter/bin/cldevic

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ng your globmade to guar

sure your qumand

cluster/bin/c

quorum devi (at least step

place the quo

ange the ‘defobal’.

place the origginal quorum

plementation

rent setting o command:

et –p global_f

etting of ‘defor each devic

ce show ‘ to sh

e show d<N>’ ing’ property

p default_fencer)

al_fencing pantee your q

uorum device

clquorum sho

ice “Access Mp a and step

orum device w

fault_fencing

ginal quorumm device).

n Planning an

of the global_

fencing=path

fault_fencingce, use the fo

how all devices

to show a spey to ‘global’, u

cing=global d<

roperty to ‘puorum devic

es is using ‘A

ow ‘

Mode” is scs b):

with a new o

g’ property of

m device back

C


_fencing pro

hcount ‘

g’ property anollowing com

s

ecific device d< use the follow

<N> ‘

athcount’. Thce is using SC

Access Mode’

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one.

f the old quo

k (in case you

Chapter 4: Nat


pery to ‘path

nd the numbmmand:

<N> wing comma

he following CSI-2 reserva

’ is scsi2, usi

wing steps m

rum device t

u want to re-u

tive MPIO


count’,

er of

and:

steps ation.

ing the

ust be

o

use the

41

EMC VPLEX Host Multipathing: Implementation Planning and Best ...

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