Unmapped BCV's

ok...if we planned to implement Timefinder/SRDF for new aix host
for that if i create a device group then which BCV devices do i need to pick from
those bcv list because if they are not mapped to FA the symdev XXXX -noport will give us
big lit of bcv's how can we determine which are currently under use or which are available (free )..

thank you.....

if you want to list bcv devices that are not mapped to any FA ..you can run symdev list -sid 123 -bcv -noport ...but as you know ..you don't have to have BCV mapped to FAs in order to use them.

if you know a little korn/bash ..you can assign output from symdev list -sid 123 -bcv -noport to a variable ...and then run it through a loop with symdev show -sid 123 #devicename ...and grep for either "Time of Last BCV Action" or "State of Pair ( STD BCV )"


Time of last BCV will tell you when it was last use ...maybe you can determine by date that something was used long time ago ..but not anymore. And State of pair may return "NeverEstab" ..which means that BCV was never used at all.

You have also "symbcv -sid xxx list" that will show you the status for every BCV device ..
As you said, grep[ping] -i for NeverEst will show you the list of bcv never established ..

symbcv will show you also the meta-members so maybe you have to filter further the output of symbcv list to have only meta heads ..

what do you typically do you in shop ..do you map BCVs to FA or do you not map BCVs ?

yes ..by those commands i can figure it out some of them are showing never established & time of last BCV action N/A .so those are available BCVs for future ...i have one doubt , if standard dev & local BCV is of size 9 Gig then remote (R2)standard dev & R2 bcvs should be in same or bigger size right ..
so at any time all these four devices should have same data and of same size, exactly like mirroring...right

thank you..

once we assign a LUN from EMC to aix host and after we config with powerpath it shown up like hdiskpower# , how to find out the relationship between hdiskpower# is devise XXX in symmetrix.. like which device is associated with which hdiskpower#...

thank you....

that's correct, starting with microcode 69, R2 can be larger than R1. I would look at Solution Enabler guide to check the restrictions when using R2 that are larger than R1 ..for example you can not use concatenated metas ..only striped.

on host install Solutions enabler and run sympd list -sid XXX or if if you can not install SE ..then download inq utility and run it, you will see something like this:

./inq.aix64_51 -sym_wwn
 
Symmetrix Device    Symm Serial #  Device #  WWN
-----------------------------------------------------------------------------
/dev/rhdiskpower0   000011122233   0862      60060480000011122233424f42383632
/dev/rhdiskpower1   000011122233   055C      60060480000011122233424f42353543
/dev/rhdiskpower2   000011122233   055D      60060480000011122233424f42353544
/dev/rhdiskpower3   000011122233   055E      60060480000011122233424f42353545
/dev/rhdiskpower4   000011122233   055F      60060480000011122233424f42353546
/dev/rhdiskpower5   000011122233   0560      60060480000011122233424f42353630
/dev/rhdiskpower6   000011122233   0561      60060480000011122233424f42353631
/dev/rhdiskpower7   000011122233   05C1      60060480000011122233424f42354331
/dev/rhdiskpower8   000011122233   05C2      60060480000011122233424f42354332
/dev/rhdiskpower9   000011122233   05C3      60060480000011122233424f42354333
 

so device column shows you your device id and which rhdiskpower# it's associated to.

My 2 cents .. please avoid R2 devices larger then R1 devices and BCV/clones larger then the source .. :-D

And have fun with TimeFinder and SRDF

can you perform Timefinder operations where target is larger then source ? SRDF docs specifically says you can ..but i did not see anything in Timefinder literature.

It's supposed to be possible to have clone target or BCV larger then the standard volumes.. But as you noted TimeFinder does not allow RIGHT NOW to have src smaller then target

hi guys ..
In my case i found all of devices (standard , local bcv , remote bcvs ) of same size , if i run

symdg show devgrp_name

below is stripped output ...i seen standard & bcv at local and bcv at remote devices but didn't
seen standard device list at remote site for this device group ..is there any command to look at those devices
& i read EMC SRDF document for my company in that i found srdf mode is adaptive copy but here i seen
adaptive copy mode is disabled so by this output my SRDF is synchrounous right now??

Standard (STD) Devices (2):
XXXXXXX

BCV Devices Locally-associated (2):
XXXXXX

BCV Devices Remotely-associated (BCV RDF) (2):
XXXXX

Device Group BCV RDF Information
XXXXX


RDF Mode : Synchronous
RDF Adaptive Copy : Disabled
RDF Adaptive Copy Write Pending State : N/A
RDF Adaptive Copy Skew (Tracks) : 65535

thank you..

run symrdf -g GroupName query, MDA column will show abbreviated letters for the mode, the look at the bottom of your output to determine mode:

for example: C.D ..which stands for adaptive copy disk mode.