You have a server named Server1 that runs Windows Server 2012 R2.
You plan to create a storage pool that will contain a new volume.
You need to create a new 600-GB volume by using thin provisioning. The new volume must use the
parity layout.
What is the minimum number of 256-GB disks required for the storage pool?
A.
2
B.
3
C.
4
D.
5
Explanation:
It takes 3 discs (minimum) in order to create a storage pool array with parity. If this array were using
fixed provisioning, this would not be enough given the 256MB capacity (since only 2/3rds of 256 X 3 –
less than 600 – could be used as actual data with the rest being parity bits), but since this array uses
thin provisioning, a 600GB volume could technically be set up on a 20GB disc and it would still show
as 600GB. (So, essentially, the question really becomes how many drives it takes in a storage pool to
create a parity array.)
References:
http://technet.microsoft.com/en-us/library/hh831391.aspx
http://www.ibeast.com/content/tools/RaidCalc/RaidCalc.asp
http://www.raid-calculator.com/default.aspx
https://www.icc-usa.com/raid-calculator
C
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Why not C? http://www.aiotestking.com/microsoft/what-is-the-minimum-number-of-256-gb-disks-required-for-the-storage-pool-2/
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https://technet.microsoft.com/en-us/library/jj822938.aspx
Requires at least three physical disks to protect from single disk failure.
With thin provisioning, space is allocated on an as-needed basis. This optimizes the usage of available storage. However, because this enables you to over-allocate storage, you must carefully monitor how much disk space is available.
Why a Raid-5 calculation? it is only similar and not identical. can anyone tell me? This question was asked for the minimum and thin provisioning indicated.
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The question ask us 3 things:
– 600-GB volume by using THIN provisioning
– volume must use the parity layout (VOLUME not storage pool)
– What is the minimum number of 256-GB disks required for the storage pool?
Just for sure, I tried to make a 2 Disk Storage Space. Then, of course, your are not able to create a Virtual Disk with parity. You need minimal of 3 disk in storage space for parity virtual disk.
I think answer is B, 3 disk. You cannot use 600Gb but you can create a 600Gb volume.
This is a polemic question:
http://www.aiotestking.com/microsoft/what-is-the-minimum-number-of-256-gb-disks-required-for-the-storage-pool-2/
http://www.aiotestking.com/microsoft/what-is-the-minimum-number-of-256-gb-disks-requiredfor-the-storage-pool/
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answer is B
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B. they state “using thin provisioning” so you can start with 3 disks in your “storage pool” and create your RAID 5 parity “storage space”. you can add more disks to the pool when you start to run out of space.
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The definition of a storage pool is: Storage pools. A collection of physical disks that enable you to aggregate disks, expand capacity in a flexible manner, and delegate administration.
In case you have to expand the volume you need the fourth disk to do so. So a storage pool always must have the capacity to foresee storage growth. But you don’t have to use the fourth disk to create the volume. But that is not the question. Then the question would be what is the minimal amount of discs to create the volume. In a more piratical environment the fourth disk is flexible and can be used to provide additional storage where it is needed. But for a healthy storage pool you need the possibility to expand the volume if needed.
So answer C can be right. But i am confused and cannot indicate for 100% c or b. Because a storage pool must deal with volume growth i would go for c.
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Definitely B as it asks for the minimum number of disks to create the pool and specifies thin provisioning will be used.
3x 256GB disks will give around 500GB space (as parity takes up a disk worth of space across the three).
Storage pools will allow you to create a 600GB thin provisioned virtual disk with the parity layout, so the answer is B; 3.
If the question had specified FIXED provisioning, 4 disks would be required (3x 256GB = around 750GB space, one disk equivalent lost for parity)
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