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DMX VIRTUAL Provisioning

DMX VIRTUAL PROVISIONING

EMC virtual provisioning builds on the base "thin provisioning"

functionality, which is the ability to have a large "thin" device

configured and presented to host while consuming physical

storage from a shared pool when needed.

Virtual provisioning also simplifies data layout, with automated

wide striping that enables to achieve better performance thanstandard provisioning.

Symmetrix Virtual Provisioning.

OVERSUBSCRIBED THIN POOL:

When total allocated size of thin device mapped to the host islarger than the size of thin pool is called oversubscribed thin

pool.

1.) Create Thin Pool2.) Create device and enble datadev attribute3.) Add data dev devices into thin pool4.) Create thin device5.) Bind TDEV to pool6.) Map and Mask Think device to host

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Step 3. Add data dev devices into thin pool:

file syntax:

add dev < dev name> to pool , type =thin,

member_state=enable;

symconfigure -sid -f < file Name > preview

symconfigure -sid -f < file Name > prepare

symconfigure -sid -f < file Name > commit

symcfg -sid show -pool -type thin -

detail

Step 4: Create thin device

file syntax:create dev count=2, config=tdev, emulation=fba,size = 50 GB;

symconfigure -sid -f < file Name > preview

symconfigure -sid -f < file Name > prepare

symconfigure -sid -f < file Name > commit

Step 5: Bind TDEV to pool:

file syntax:

bind tdev 03D1:03D2( thin device) to pool aashu_thin;

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symconfigure -sid -f < file Name > preview

symconfigure -sid -f < file Name > prepare

symconfigure -sid -f < file Name > commit

Then we can map and mask these devices to host same way as

we do with regular devices.

Parameter of pool Max. Subscription percent is very

important. It describes maximum oversubscription of pool. By

default the value of this parameter is none means there is nolimitation of oversubscription ration. We can bind allocate

TDEV size as we want even far larger than size of pool.

If we set the value of this parameter as 0. Then we cannot

bind any thin device to this pool.

If the parameter value is 100. Then we can bind space of TDEVthat is equal to the size of pool.

To set oversubscription ratio on thin pool:

file syntax:

set pool , type thin, max_subs_percent= ;

symconfigure -sid -f < file Name > preview

symconfigure -sid -f < file Name > prepare

symconfigure -sid -f < file Name > commit

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