VMAX : Thin pool and thin devices

[Srinivas Adusumalli]

Hi All,

Thank u all for your active participation in group.Here is my question.In my current project ,thin pool/thin devices allocated to VMWARE DATASTORE and not able to figure out advantage of forming meta LUN from these thin devices ?


Regards
Srini

[Muralidhar Kasagana]

Hi Srini,

Forming meta will give adavantage if your are using different
filesystems with different sizes.

thin devices already stiped across all the devices which are there in
corresponding thin pool & we will get good IO performace if we do
stripe at Volume manager software level.

EMC is strongly recommending software striping at host volume manager
level to get good IO performance.

In your case if you present thin pool to VMWARE DATASTORE we will not
get a chance to stipe at host volume manager level.

Hope you got my point.

Thanks & Regards,
Muralidhar

--
Regards,
Muralidhar K
Mobile: +971551706705

[Srinivas]

Hi Srini,

More over if you go for FAST VP in future, it will be very much useful
in tiering hyper level(much granular).

Regrads
Srinivas Karnati

On May 18, 8:05 pm, Muralidhar Kasagana

<muralidhar.kasag...@gmail.com> wrote:
> Hi Srini,
>
> Forming meta will give adavantage if your are using different
> filesystems with different sizes.
>
> thin devices already stiped across all the devices which are there in
> corresponding thin pool & we will get good IO performace if we do
> stripe at Volume manager software level.
>
> EMC is strongly recommending software striping at host volume manager
> level to get good IO performance.
>
> In your case if you present thin pool to VMWARE DATASTORE we will not
> get a chance to stipe at host volume manager level.
>
> Hope you got my point.
>
> Thanks & Regards,
> Muralidhar

[Srinivas Adusumalli]

Guys to be Honest, Not conveinced with your views.. Come back to you with reasons.

 

Thanks

Srini

[Srinivas Karnati]

Hi,

I have given answer for advantage in using the thin pools in VMAX,
appologies for that, as per my understanding to maintain the
uniformity across all the symmetrixes for SRDF purpose, as you need to
have same no.of Metamembers across primary and secondary devices(there
may be some other reasons as well).

Regards
Srinivas Karnati

--
Thanks & Regards
Srinivas Karnati

[Srinivas Adusumalli]

Hi All,

u guys are correct and I believe this is underlying fact  form a thin devices  meta ( got a doc from power link) . thanks Murali and Karnati.

<EMC DOC>

When a write is performed to a portion of the thin device, the Symmetrix
array allocates a minimum allotment of physical storage from the pool
and maps that storage to a region of the thin device including the area
targeted by the write. These storage allocation operations are performed
in small units of storage called “thin device extents.” Thin device extents
may also be called “chunks,” “track groups” or just “extents.” The
Symmetrix array uses a round-robin mechanism to balance the allocation
of extents across all the data devices in the pool that are enabled and that
have remaining unused capacity. The extent size is 12 tracks (768 KB).
That means that the initial bind of a thin device to a pool causes one
extent, or 12 tracks, to be allocated per thin device. So a four-member
thin meta device would cause 48 tracks (3078 KB) to be allocated when
the meta is bound to a thin pool.

[santhosh kumar]

Annaya,

 

If possible can you send us that EMC document....

 

Regards,

Santhosh.D.

[Srinivas Adusumalli]

Santosh,

 

I downloaded this docs in my personal laptop and send it to u later this evening .. ( For u tommorow morning)

 

 

 

Regards

Sr

[Srinivas Adusumalli]

Santosh,

PFA

Regards
Srini

[gnaneshwara prasad]

Hi Srini,

Please could you resend the doc,not able to open.

Regards,
Gnani

On May 22, 6:37 am, Srinivas Adusumalli

<srinivasa.adusuma...@gmail.com> wrote:
> Santosh,
>
> PFA
>
> Regards
> Srini
>
> On Mon, May 21, 2012 at 9:43 AM, Srinivas Adusumalli <
>
>
>
> srinivasa.adusuma...@gmail.com> wrote:
> > Santosh,
>
> > I downloaded this docs in my personal laptop and send it to u later this
> > evening .. ( For u tommorow morning)
>
> > Regards
> > Sr
>

> >>>> On 5/19/12, Srinivas Adusumalli <srinivasa.adusuma...@gmail.com> wrote:
> >>>> > Guys to be Honest, Not conveinced with your views.. Come back to you
> >>>> with
> >>>> > reasons.
>
> >>>> > Thanks
> >>>> > Srini
>
> >>>> > On Fri, May 18, 2012 at 11:29 AM, Srinivas

> >>>> > <karnati.srinivas2...@gmail.com>wrote:

>  Virtual provisioning.pdf
> 3219KViewDownload- Hide quoted text -
>
> - Show quoted text -

[Srinivas Adusumalli]

Gnani,

PFA

Regards
Srini

[gnaneshwara prasad]

Thanks Srini.

 

Regards,

Gnani