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rpatel1120
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TDAT Cylinder Creation Question

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I am looking for a simple way to come up with Cylinder size/TDAT based on disk requirements below.

I am planning on configuring pool1 with following configuration.


a) place in Disk Group 3 (42 * 300GB FC disk)

  - TDAT hypers on disks

  - Raid 10

I am planning on configuring pool2 with following configuration.

b) place in Disk Group 2 (40 * 200GB EFD disk)

  - TDAT hypers on disks

  - Raid 5 (3+1)

c) place in Disk Group 2 (68 * 300GB FC disk)

  - TDAT hypers on disks

  - Raid 10

d) place in Disk Group 2 (16 * 2000GB SAS disk)

  - TDAT hypers on disks

  - Raid 10

I am planning on configuring pool3 with following configuration.

e) place in Disk Group 3 (10 * 600GB FC disk)

  - TDAT hypers on disks

  - Raid 10

Based on the requirement above, is there a formula or tool I can use to come up with number of splits, cylinder/TDAT sizes?

Any help on this topic is much appreciated as I am trying to figure out best approach on this design.

Thanks,

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8 Krypton

Re: TDAT Cylinder Creation Question

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If this is for an Epic Electronic Medical Record (EMR) deployment on a VMAX then there are a few areas where the recommend design will deviate from the general EMC best practices. One of those EMC specific recommendations for the Epic Cache database is indeed 4 splits per disk for the TDATs.

There are other specifics for Epic that need to be followed as well to ensure a successful deployment. EMC has a healthcare practice that focuses on EMR and I recommend you reach out to your EMC representative to engage that group.

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27 Replies
8 Krypton

Re: TDAT Cylinder Creation Question

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What hyper sizes are you planning to use?

Thanks,

Sreehari

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rpatel1120
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Re: TDAT Cylinder Creation Question

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I was thinking of doing following.

These disk groups will have a standard splits.

b) place in Disk Group 2 (40 * 200GB EFD disk)

  - TDAT hypers on disks

  - Raid 5 (3+1)

c) place in Disk Group 2 (68 * 300GB FC disk)

  - TDAT hypers on disks

  - Raid 10

d) place in Disk Group 2 (16 * 2000GB SAS disk)

  - TDAT hypers on disks

  - Raid 10

These disk groups will have a 4 way splits.

a) place in Disk Group 3 (42 * 300GB FC disk)

  - TDAT hypers on disks

  - Raid 10

e) place in Disk Group 3 (10 * 600GB FC disk)

  - TDAT hypers on disks

  - Raid 10

I am new to design side so just trying to learn as well as to follow best practice guides.

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8 Krypton

Re: TDAT Cylinder Creation Question

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Why have different disk groups with different split counts?

Every pool should have 8 splits per disk.

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rpatel1120
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Re: TDAT Cylinder Creation Question

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Per Application requirement we need to have four split on pool 1. which is 42 * 300 GB FC drives.

In this design I will have about four different pool so my in order for the different splits I will need to create separate disk group. is that not the case? What would be the better design?

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8 Krypton

Re: TDAT Cylinder Creation Question

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Each thin pool should have 8 splits per drive, or the minimum number to use the capacity of the disk.  I don't see why an application should care about how the data devices are laid out on the pool.  I can understand the requirement for segregation on disks.  However be careful when segregating.  Make sure you have enough drives to support the workload.  Also make sure your drives you are segregating onto are spread evenly across engines.

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rpatel1120
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Re: TDAT Cylinder Creation Question

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I agree. All the best practice guides I have seen recommends 8 way for some reason for this app I am being asked to design with 4 way splits on FC disks. But for the EFD we can use standard 8 way.

As far as splitting the drives across, is that something I can have installation engineer make sure during bin file creation or something I need to add in my configuration?

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rpatel1120
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Re: TDAT Cylinder Creation Question

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I have following pool design that I am trying to implement with splits recommended pre application requirement.

48, 300GB 15k drives RAID 1+0 (Pool1)

48, 300GB 15k drives, RAID 1+0 (Pool2)

 

24, 600GB 15kdrives, RAID 3+1 (Pool8)

40, 200GB SSD, RAID 3+1 (FAST Pool 5&6)

68, 300GB 15k drives, RAID 1+0 (FAST Pool 5&6)

16, 2TB 7.2k drives, RAID 6+2 (FAST Pool 5&6)

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8 Krypton

Re: TDAT Cylinder Creation Question

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Rakesh,

From the pool names and split details you are referring to I take it you are working on a project for an Epic deployment? If so please contact the EMC Healthcare Delivery Champions to assist you. You will find them in your Global Address List.

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rpatel1120
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Re: TDAT Cylinder Creation Question

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I am getting conflicting information on the split size and that is one of the reason I am requesting help from community.


The documents I have from EMC suggest the Split size should be minimum of 8 but I am being asked to go with 4 splits on 300 Gb drives. I wanted to verify if that recommendation is based on best practices since I can't find any doc that shows that.


Thanks,

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