Types of SSD Drives and differences

 

Types of SSD Drives and differences

There are 2 categories of SSD drives:

SSD drives for end users and SSD Enterprise Drives for Datacenters. And their differences are given by 3 factors:

1. Durability.

This factor is determined by something called TBW (Terabytes Written) which limits how much data the drive will support in writing before being damaged. Ex: A normal user SSD disk supports on average about 250 Teras of writing only, while an Enterprise SSD hard disk supports from 900 Teras of writing and up. We clarify that all these are average values. After these values ​​the data may be at risk.

2. Performance.

Determined by IOPS, Sequential Read and Write, and Random Read and Write access values. The higher these values ​​are, the better response capacity in stressful situations.

3. Data Integrity.

Enterprise SSD hard drives have special caches, which are chips inside the boards, which protect against sudden shutdowns and are ideal for server architecture supporting RAID arrays. On the other hand, a Client SSD disk is generally used in laptops that have a battery in case of power outages.

NVME SSD or Enterprise SSD?

The answer is. It depends on the use case and what you want to pursue. NVME SSD is faster, but not all NVMEs work well with RAIDS and some server chassis only have room for a single NVME drive making it a single point of failure and would not be recommended for mission critical if this were the case. stage.

First let's try this in a public cloud, dumping 4 Gigs to an SSD

What is evidenced.

Write speed at 25.4 MB/S. First, we make it clear that we take the cheapest plan with SSD on that provider. What we found is that this write speed is slow, but it is understood that, being cheap, the provider reserves the right to distribute the speed of the SSDs and the load of disks among all the clients of that public cloud. This is NOT a recommended speed for heavy database use, even if you have an SSD installed, but it might work for very basic stuff. Conclusion: It makes sense, there is a relationship between cost and speed, the provider promised SSD and is fulfilling it but slowly, so an application would work with a performance penalty. Is everything clear now? Let's continue..

LOCAL ECONOMIC SSD DISK (WITHIN THE SAME CHASSIS)

RESULT: Write Speed ​​at 335 MB/S. It is not a slow speed, but being local, its speed begins to degrade over time as clients grow because the Board has speed limits inside the chassis. Useful for basic needs, but it is recommended to find out how much speed you will be allowed.

NFS DISK EXTERNAL TO CHASSIS (ECONOMIC SATA)

RESULT: Write Speed ​​at 148 MB/S. Slower than the local SSD, but it supports more congestion when it is outside the Chassis and it is cheaper than an SSD. It is recommended as a file store, large data volumes and simple virtual machines.

ISCSI DISK IN SAN EXTERNAL TO CHASSIS (SAS)

RESULT:

302 MB/S Write Speed ​​(ISCSI Economy Line)

Write speed at 810 MB/S. (ISCSI Performance Line)

Faster than a local SSD, it supports greater congestion when being outside the Chassis and balances the traffic in Multipath. It is a more expensive technology than the previous ones, because there is a network involved, better equipment and better elements involved. Recommended for VPS with applications.

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JBOD CAB DISCS (SAS PERFORMANCE)

RESULT: Write Speed ​​at 1.4 GB/S. Faster than a local SSD disk and all the previous ones because it uses certified hardware and better technical specifications. Supports greater congestion when outside the Chassis and balances Multipath traffic at 10 Gbps. Ideal technology for high-performance Virtual Machine service.

JBOD CAB DISCS (SAS ULTRA-PERFORMANCE)

RESULT: Write Speed ​​at 2.2 GB/S. Faster than all the previous ones because it uses certified hardware and better technical specifications. Supports greater congestion when outside the Chassis and balances Multipath traffic at 10 Gbps. Ideal technology for high-performance Virtual Machine service.

Why do VPS with SSD exist and are they slow?

Although it shouldn't happen, you are probably speed limited, IOPS limited, or sharing disks with many clients. So, even if you buy a VPS with SSD, it is no guarantee that everything will work fast for you. Our recommendation is that you inquire about the read/write speed that they allow you and the IOPS that you have and that they guarantee you those values ​​by contract.

Conclusions...

An SSD does not necessarily mean higher speed if the proper design architecture is not used.

A JBOD can be faster if it is also combined with an Enterprise SSD

An NVME SSD is generally a single point of failure as it is within the same chassis and is not recommended for RAIDs. (Only in few exceptions)

100 Gigs in fast storage is better than 1000 Gigs in cheap storage.

If you need a high response speed, this can only be achieved with high technical performance hardware.

Everything you spend on storage pays off, whether it's in profit or trouble. Therefore, a good selection of storage is crucial.

That there are no cheap VPS, there are VPS with low writing speeds.

That not always in a large provider, you are receiving the best for your specific need.

Tips when choosing storage for your VPS

Check if the storage is local or external. Local for basic loads, external for loads that require higher performance.

Ask them to guarantee the disk write speed. High speed on a jbod is better than speed limiting on an ssd.

Choose your workloads wisely. For database applications, fast disks are required, for file needs, low-performance disks are used.

If your loads are critical, set a reasonable budget for the supplier to install good items for you. Remember that it is you who is affected by lowering the budget, not the supplier, because it will deliver the equivalent of the investment.

Evaluate the risk vs investment.

And what about Storage Clusters?

Storage clusters consist of joining multiple JBOD cabinets in order to provide:

Fault tolerance

Load balancing

Data dispersion between cabins

The benefits are high availability and its disadvantage is its cost. Contact us if you require these solutions.  best hosting services 

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