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Question
Monday, March 9, 2015 8:46 PM
Hi All,
This is really annoying. I'm comparing and trying to understand the Azure virtual machines types, and i did not find anything about the difference between these two terms:
For example:
D-Series:
Standard_D1\same) OS = 127 GB Temporary (SSD) =50 GB
DS-Series:
Standard_D1\same) OS = 127 GB Local SSD Disk= 7 GB
What i sthe difference between Temporary and local SSD ?
Is OS disk of the DS-Series's VM SSD or HDD ?
Regards, Samir Farhat Infrastructure and Virtualization Consultant || Virtualization, Cloud, Azure ? Follow and Ask here https://buildwindows.wordpress.com
All replies (10)
Friday, April 17, 2015 7:09 AM ✅Answered | 1 vote
And here we are, finally an official blog that prooves that the local SSD disks are temporary too.
Lakshmeesha, you were right, your answer was right but with no proof. Today i share with you the proof
" A VM’s temporary disk stores the OS paging file and can be used by applications to store data that does not need to be persistent."
http://azure.microsoft.com/blog/2015/04/16/azure-premium-storage-now-generally-available-2/
Nice day
Regards, Samir Farhat Infrastructure and Virtualization Consultant || Virtualization, Cloud, Azure ? Follow and Ask here https://buildwindows.wordpress.com
Tuesday, March 10, 2015 5:21 AM | 1 vote
hi;
Virtual machines are available in two tiers – basic and standard. Both types offer a choice of sizes, but the basic tier doesn’t provide some capabilities available with the standard tier, such as load-balancing and auto-scaling. The standard tier of sizes consists of A series, D series, DS series, and G series.
- D-series VMs are designed to run applications that demand higher compute power and temporary disk performance. D-series VMs provide faster processors, a higher memory-to-core ratio, and a solid-state drive (SSD) for the temporary disk. For details, see the announcement on the Azure blog, New D-Series Virtual Machine Sizes.
- DS-series VMs can use Premium storage, which provides high-performance, low-latency storage for I/O intensive workloads. It uses solid-state drives (SSDs) to host a virtual machine’s disks and offers a local SSD disk cache. Premium storage is in Preview and is available in certain regions. For details, see Premium Storage: High-Performance Storage for Azure Virtual Machine Workloads.
Source :: https://msdn.microsoft.com/en-us/library/azure/dn197896.aspx?f=255&MSPPError=-2147217396
Warm Regards;
Prasant
Tuesday, March 10, 2015 8:18 AM
Hi,
Yes i see that but my question is still:
Difference between temporary disk and local ssd disk: is the local ssd disk persistent or not?
Is the os drive of the DS series on SSD or not?
Thanks
Regards, Samir Farhat Infrastructure and Virtualization Consultant || Virtualization, Cloud, Azure ? Follow and Ask here https://buildwindows.wordpress.com
Tuesday, March 10, 2015 9:02 AM | 1 vote
I think i understand it but someone has to confirm that, i don't want to share wrong information.
In the D-Series, The Operating system fiels are located in a HDD storage (Standard performance), the temporary disk is also located in a local HDD storage (Local means on the physical host storage). Temporary means that the content is not persistent and that every reboot, crash or physical server host change, the content will be lost. This temporary storage has to be used only for volatile data like pagination and swap files
In the DS-Series, the Operating system files are located in a HDD storage too, but we have also a disk located in a local SSD storage, that is not temporary. We can maybe use it for some applications that need fast caching or something like that.
Need confirmation and votes, welcome community
Regards, Samir Farhat Infrastructure and Virtualization Consultant || Virtualization, Cloud, Azure ? Follow and Ask here https://buildwindows.wordpress.com
Friday, March 13, 2015 5:19 AM
Hi Samir;
Both temp and Local SSD are the same.
Source: http://azure.microsoft.com/blog/2014/09/22/new-d-series-virtual-machine-sizes/
Local Storage SSD Drive
On these new sizes, the temporary drive (D:\ on Windows, /mnt or /mnt/resource on Linux) are local SSDs. This high-speed local disk is best used for workloads that replicate across multiple instances, like MongoDB, or can leverage this high I/O disk for a local and temporary cache, like SQL Server 2014’s Buffer Pool Extensions. Note, these drives are not guaranteed to be persistent. Thus, while physical hardware failure is rare, when it occurs, the data on this disk may be lost, unlike your OS disk and any attached durable disks that are persisted in Azure Storage
Customer are not recommended to store Costly data on these drives which could be lost when the VM moves to a different node.
Warm Regards;
Prasant
Monday, March 16, 2015 8:28 PM
I think my thoughts were right.
See here (By Aidan Finn)
http://www.petri.com/choosing-azure-vm-series.htm
D-Series Virtual Machines
Host-local SSD: The host uses a local SSD volume to place the temporary drive of the running virtual machines. This provides faster paging and the ability to (disk) cache app/database data at ultra-high speeds with low latency.
DS-Series Virtual Machines
Maybe you have a workload that needs local SSD caching and SSD for the normal application data too?
Regards, Samir Farhat Infrastructure and Virtualization Consultant || Virtualization, Cloud, Azure ? Follow and Ask here https://buildwindows.wordpress.com
Tuesday, March 17, 2015 9:30 PM
I don't know why my answer has been unmarked as an answer.
The question in this thread is the difference between the D: drive in the Azure D-Series and DS-Series. If the answer of Prasant is right ie Local SSD = Temporary SSD, then why Microsoft gave them two different names, just to confuse some people like me, to push us to ask questions in technet !! No, Microsoft gave them different names because they are different, and because the local SSD in the DS-Series is not temporary!!
The link Prasant provided here is talking about the D-Series : Nice, but incomplete. We need a link talking about the DS-Series that prove that the local SSD is this type of VMs is temporary.
I will leave this thread open, maybe someone can help us :)
Regards, Samir Farhat Infrastructure and Virtualization Consultant || Virtualization, Cloud, Azure ? Follow and Ask here https://buildwindows.wordpress.com
Wednesday, March 18, 2015 7:00 AM
Hi Samir,
Happy Day!!!
The details posted earlier has everything needed in terms of differences between Local SSD and DS-Series, the post which has been marked as answer is correct as proposed. Lets adhere to this and follow the rules of the engagement on forums. Thank you
Happy Day!!!
Monday, March 30, 2015 3:41 PM
i'm really disappointed of the manner that you are treating the community. I asked the question, and i'am telling you, that the answer is not convincing. What's the matter here!
If you want me to be convinced, or even to convince the community, give a answer that can be understood with clear statement. On the link you posted, there's no a clear answer of the question and i explained you why.
So please, let this thread opened until we find the right answer.
Regards, Samir Farhat Infrastructure and Virtualization Consultant || Virtualization, Cloud, Azure ? Follow and Ask here https://buildwindows.wordpress.com
Friday, July 31, 2015 9:53 PM | 2 votes
The question is certainly not answered. The question is why 50 GB vs 7 GB and how does this make sense and how is it implemented. No points until then