vijay_bhati
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FAST VP Metalun Best practices

What are the best practices / recommendation for metalun under FAST VP

i.e.

how many no. of the tdevs can be added to metalun

what is the maximum size of the metalun

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10 Replies
8 Krypton

Re: FAST VP Metalun Best practices

You can have up to 255 members in a meta, and each member on VMAX can be about 240GB in size, if you need a volume that large.

If you are using a meta volume for performance reasons on VP, up to 16 members is plenty to max out performance, and in most cases, 8 is enough.

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vijay_bhati
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Re: FAST VP Metalun Best practices

Hi,

Thanks for response.

To provide more in detail;

I am planing to provide only one metavolume/lun per filesystem to the hosts, hence in case if the filesystem needed the size more than the one thin device, i can address that using the metavolume. In case of future growth requirement i can provdie that by attaching the thin device to metavolume.

So my query was what is optimal no. of thin devices can be attached to metavolume, this is also related for growth, wherein i can draw the line about the maximum no. of tdevs in metavolume for the optimal performace resons, beyond that the host should have another filesystem.

Thanks,

Vijay

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8 Krypton

Re: FAST VP Metalun Best practices

HI Vijay,

As Quincy said, for optimal performance 8 or 16 hypers you can attach to your meta volume. With 16 hypers, you can reach up to 3.7 TB which is a good amount for most applications.

regards,

Saurabh

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8 Krypton

Re: FAST VP Metalun Best practices

Do you really mean hypers? I think you mean devs, right? A dev is made of hypers/slices/splits.

Take a look at http://www.50mu.net/facilitate-the-conversation-say-what-you-mean-and-dont-make-assumptions/ for the correct terminology. No offence.

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8 Krypton

Re: FAST VP Metalun Best practices

Correction, Dev it is. nice link

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8 Krypton

Re: FAST VP Metalun Best practices

Thank you

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vijay_bhati
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Re: FAST VP Metalun Best practices

Thanks alll for response.

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Rajavulla
6 Indium

Re: FAST VP Metalun Best practices

Size of the Hyper is really matters based on number of BackEnd Directors and FrontEnd Directors

In General VMAX 10K 8 drives per engine on 959 series

In General VMAX 10K 16 drives per engine on 987 series

Number of hypers that limit based on BackEnd Directors and FrontEnd Directors, for example if you have 2 engine 4 directors and 4 engine 8 directors, 16- way Meta 128 GB Hypers  for 2 TB LUN would get you optimum performance

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8 Krypton

Re: FAST VP Metalun Best practices

Rajavulla,

I'm confused.  The size of a given data device (TDAT) or given TDEV has nothing to do with the number of directors in the system, FE or BE.

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