DRAG DROP
You have a server that runs Windows Server 2012 R2.
You need to create a volume that will remain online if two disks in the volume fail. The
solution must minimize the number of disks used to create the volume.
Which three actions should you perform in sequence? (To answer, move the appropriate
three actions from the list of actions to the answer area and arrange them in the correct order.)
Answer: See the explanation.
Explanation:
Box 1: Add five physical disks.
Box 2: Create a virtual disk.
Box 3: Create a storage space by using the default disk allocation.Windows Server 2012 R2 R2 introduces a parallelized repair process, where the remaining
healthy disks move around and take responsibility for the slabs of data that were stored on
the failed disk. It is extremely quick because all disks in the storage space are involved. The
recommendation is that instead of using hot spares, you instead use the disks that are spare
but active capacity in the storage space, that can be availed of by the parallelized repair
process. This will both offer more IOPS to normal production storage activity and leave your
business less vulnerable during a repair process
this iis true :
add five physical disks
create a storage space by using the default disk allocation
create a virtual disk
Funny how you say true. Explanation says Box 1, 2 & 3. Yet the answer is Box 1, 3 & 4. Sorry but i have to question your credibility here. Your answer is totally wrong and If I may make suggestion, Do post anything here especially when you don’t know what you’re talking about.
Funny how you say true. Explanation says Box 1, 2 & 3. Yet the answer is Box 1, 3 & 4. Sorry but i have to question your credibility here. Your answer is totally wrong and If I may make a suggestion, Don’t post anything here especially when you don’t know what you’re talking about.
i agree with vahid
RAID-5 volume Consists of space on three or more physical disks, all of which must be
dynamic. The system stripes data and parity information across all the disks so that if one physical disk fails, the missing data can be re-created by using the parity information on the other disks. RAID-5 volumes provide improved read performance because of the disk striping, but write performance suffers due to the need for parity calculations.
Windows Server 2012 R2 supports two hard disk partition types: MBR and GPT; two
disk types: basic and dynamic; five volume types: simple, striped, spanned, mirrored,
and RAID-5; and three file systems: ReFS, NTFS, and FAT.
sorry i can not got it why not 3 disks ?
bc “you need to create a volume that will remain online if two disk in volume faill”
Answer should be 3 disks. It doesn’t say how big the volumes need to be, simply that it must remain online. In the case of 3 disks, 2 will act as a mirror and the 3rd will be a hotspare should 1 fail. That being said, it will allow 2 disk failures before the volume goes offline.
Reading further I realized I was wrong. You do need 5 disks and the reason is because of a three-way mirror. Here’s some reference docs:
http://social.technet.microsoft.com/wiki/contents/articles/15200.storage-spaces-designing-for-performance.aspx
https://social.technet.microsoft.com/Forums/windowsserver/en-US/8f13ecf3-61c8-4505-90da-e8a01023c62d/storage-spaces-disk-resiliency?forum=winserverfiles
“… that will remain if two disks in the volume fail.”
This can only be achived with a Raid 5 and a Hot Spare.
If the first disk crashes the Raid Controller takes the Hot Spare disk and repairs the raid. If the second crashes the raid degrades, but the volume is still online.
Box 1: Add five physical disks
Box 2: Create a storage … with a Hot Spare
Box 3: Create a virtual disk
I agree!
And what about “minimize the number of disk used”
RAID 1 + Spare => three disks and tolerance for 2 disk failure.If one disk fails the spare take his place and then another disk can fail without lost of data.
1: Add three physical disks.
2: Create a storage space and set the disk allocation of one of the disks to Hot Spare.
3: Create a virtual disk.
Hi Daniel,
You are correct in a way but what happens if the 2 disks that fail are the 2 disks with “data”? the hot spare is useless. There for the 100% reliable option is 5 disks.
🙂
I forgot to mention fail at the same time i.e before the spare has had time to replicate
Tested this on my lab:
5 physical disks
Create Storage Pool, then Create Virtual Disk, then Create Volume.
When specifying Virtual Disk, you can select the “layout” being Mirror the one that lets you
have 2 disks that fail.
So answer is :
ADD 5 DISKS
CREATE STORAGE POOL (DEFAULT)
CREATE VIRTUAL DISK
It’s interesting, because there’s no storage pool option. Of course it would be the second step after you add the 5 disks. And, if there is storage pool, the next step should be to create a virtual disk. And the last step to create a volume on it.
Do they mean that create a storage space is equal with storage pool? I don’t think so.
https://www.youtube.com/watch?v=oF1VoIftDMs
https://technet.microsoft.com/en-us/library/hh831739.aspx
What’s new in Storage Spaces in Windows Server 2012 R2
The following table describes the changes in Storage Spaces functionality that are available in this release.
Automatically rebuild storage spaces from storage pool free space
New
Decreases how long it takes to rebuild a storage space after a physical disk failure by using spare capacity in the pool instead of a single hot spare.
https://technet.microsoft.com/en-gb/library/dn387076.aspx
Box 1: Add five physical disks.
Box 2: Create a storage space by using the default disk allocation.
Box 3: Create a virtual disk.
In Windows Server 2012 Storage Spaces, a 3-way mirror requires at least 5 physical disks.
The reason is that a 3-way mirror uses a quorum. In order to keep running, the mirror space must keep over 50% of the disks functioning. So a 3-way mirror must have at least 5 physical disks to be able to survive the loss of up to 2 physical disks.
Moreover, we need to make a difference between storage space and storage pool:
A pool is simply a logical grouping of physical disks, whereas a storage space is a virtualized disk that can be used like a physical disk.
To be sure about the answers, try to go through the creation process of the volume and you will see more explanation.
Hope it helps.
simo is right
There is something called three-way mirroring from what I am reading.
http://arstechnica.com/civis/viewtopic.php?t=1203237
Not I would use a hot spare if I was configuring a server in real life….
never know what MS is really looking for.
https://technet.microsoft.com/en-us/library/jj822938.aspx
this link mentions using a hot spare…
There’s no need for Hot Spare.
The fault tolerance built into Storage Spaces is provided at the disk level, at their creation when choosing the Storage Layout (Simple, Mirror, Parity).
I tested storage pool with only 3 disks and it doesn’t work with 2 disk failures
– Add 3 disks to new storage pool
– 1 of the disk is marked as hotspare
– created a mirror volume using maximum size
– failed on of the 2 mirror disks and volume still works
– now failed the other disk, leaving only hotspare, volume goes offline
– storage pool when into READ-ONLY mode, I had to $@$@$!@%^ fix it
So you definitely need 5 disks minimum to withstand 2 disk fails