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SYMMETRIX

EMC Symmetrix: VCMDB and ACLX

VCMDB:Volume Control Manager Database

ACLX:Access Control Logix

VCM:Volume Control Manager device (where the database resides)

VCM Gatekeeper:Volume Control Manager Gatekeeper (database doesnt reside on these devices)

SFS Volumes:!"mmetrix #ile !"stem Volumes

$% "ou work with &MC !"mmetrix s"stems' "ou know the importance o% VCMD $ntroduced with !"mmetrix *+ and

used in ever" generation a%ter that' VCMD stands %or Volume Control Manager Database) Also in the latest

generation o% s"stems the VCM device is at times also re%erenced as VCM Gatekeeper

VCMD is a relativel" small device that is created on the !"mmetrix s"stem that allows %or hosts access to various

devices on the !"mmetrix VCMD keeps an inventor" o% which devices have access to which host (,As) -ithout a

VCMD in place' host s"stems will not be able to access the !"mmetrix .he VCMD should be backed up on regular

intervals and would be help%ul in a rain" da"

.he VCMD device si/e grew along with new generations o% !"mmetrix s"stems that got introduced' primaril" a means

to keep a track o% more supported devices (h"pers 0 splits) on these plat%orms -ith the introduction o% !"mmetrix V1

Max' the VCMD concept is now a bit changed to ACL2 (Access Control Logix) Access Logix is being used on the

Clariion s"stems %or "ears now

Here are a e! t"in#s to $onsider !it" VCMDB

3n the older !"mmetrix s"stems (*+' *4' 5+ and 55)' the VCMD (device) is mapped to all the channels'

host

$n these s"stems the VCMD access is t"picall" restricted b" Volume Logix or ACL (access control lists)

-ith the !"mmetrix DM2' DM26 !"stems 7 &nginuit" Code 589+' 589: the VCM device onl" re;uires to be

mapped to the Management stations

Management stations include !

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$% the device c"linder si/e is e;ual with a conversion "ou are attempting' the %ollowing will help "ou convert

"our VCMD %rom t"pe x to t"pe "

o ackup the device

o symmaskdb sid backup file backup

o Check the VCMD t"pe using

o symmaskdb sid list database

o Convert %rom t"pe * to t"pe 5

o Symmaskdb sid convert vcmdb_type 5 file Covertfilename

%o initiali2e VCMDB or t"e irst time on a Symmetrix System

-ithin $onix Control Center

Click on the !"mmetrix arra" "ou are tr"ing to initialize the VCM!

!elect Maskin"then VCM! Mana"ementand then initiali/e

!elect a new backup and create a %ile name

Create a %ile name with #sdm extenstion

Click on$ctivate the VCM!

VCMD backups are stored at %home%ecc_inf%data%hostname%data%backup%symmserial%

Also it will be viewable within $onix Control Center at Systems&Symmetri'&VCM! !ackups&

-ith !"mCL$

.o ;uer" the VCMD database

o symmaskdb sid list database

o .o backup and init an existing VCMD database

symmaskdb sid init file backu