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               Synology NAS for VMware

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Sizing concepts

The first two inquiries to ask when choosing a Synology NAS as a VMware storage are likely "How do I choose a mannequin of Synology NAS?" and "how many HDDs and SDDs do i want?"

In deploying a VMware atmosphere, it is important to grasp no matter if a storage equipment can meet workload requirements. The variety of IOPS (enter/Output Operations Per 2nd) always serves as a place to begin measure for this goal. During this part, we can provide materials for estimating the IOPS of a production atmosphere in addition to tips on random IOPS of Synology NAS servers.

Estimating workload

To estimate the workload of your production atmosphere, you can seek advice from the official Synology weblog for positive recommendations on a way to measure IOPS for VMware and the way to measure IOPS for windows. There are also third-party tools, corresponding to VeeamONE or others (obtainable by way of shopping “VMware server monitoring”), which deliver a person-pleasant GUI for IT administrators to achieve efficiency statistics in addition to capability and health advice of their virtualized environments.

Measuring storage performance

Workloads of virtualized environments primarily contain random IOPS. The variety of random IOPS is continually a trademark of storage performance, that can support select a storage system that most excellent meets workload demands. Tips on highest random IOPS of Synology NAS models is purchasable on Synology’s Product efficiency web page, right here partially duplicated under for brief reference.

The determine above illustrates the maximum random read/write IOPS of Synology XS/XS+ sequence models absolutely loaded with SSDs in a 10GbE atmosphere. Specific efficiency may be slower with tough disk drives put in, with roughly 75 study random IOPS per SATA disk and a hundred and fifty study random IOPS per SAS pressure. Write efficiency should be seventy five% slower than examine performance if RAID 5 is used.

Overall efficiency can also be calculated by means of multiplying the IOPS per disk by using the variety of disks put in. Enabling SSD cache is strongly suggested, as it continually gives you a three instances performance benefit or greater, reckoning on the workload class. As an example, 10 SATA drives at the side of two SSDs for cache will provide approximately 2,250 random study IOPS (75 * 10 * 3 = 2250). For greater tips about SSD cache, please read using Synology SSD technology to enhance equipment performance.

Please observe that the numbers above are just a tough estimate. A rule of thumb recommends reserving 20% or more as a buffer to enable subsequent alterations based on the performance of the ambiance. The frequently approved industry-general for datastore latency is 20 ms or less. In case of high latencies on someone VMware datastore, trust increasing the measurement of SSD cache or the usage of committed volumes consisting absolutely of SSDs for these iSCSI LUNs to save VMs.

Connecting a VMware Host to Synology iSCSI

To make certain the community satisfactory of an iSCSI storage, together with its reliability and performance, we advocate dedicating two or extra physical network interfaces to the iSCSI site visitors between your VMware host and Synology NAS, primarily when 1GbE community ports are used. We additionally recommend using iSCSI utility HBAs (Host Bus Adapters), considering our compatibility exams had been performed with iSCSI utility HBAs.

When there are distinct community ports, it is required to configure iSCSI MPIO (Multipath I/O) to achieve load balance and high availability for the iSCSI storage community. Word that there should still be one IP handle per community interface and that link aggregation should now not be configured. There are two how one can configure iSCSI MPIO: by means of port binding or in separate domains.

System 1: Port Binding

Here’s the simplest way to configure MPIO, with here necessities:

• An iSCSI utility HBA is used.

• All VMkernel ports used for iSCSI and for Synology NAS ports are within the same local community and within the equal IP subnet.

• All VMkernel ports are in the equal vSwitch.

You could consult with this tutorial to do it.

For greater certain information on port binding, talk to the elements beneath.

Formula 2: Separate Domains

This formula may still be utilized in right here scenarios:

• Target iSCSI community ports are on diverse local networks and IP subnets.

• VMkernel ports used for iSCSI are on different vSwitches.

That you can confer with this tutorial to do it.

Two actual switches are suggested for the connectivity between the ESX host and the Synology Storage array to evade single switch failure that may cause an outage to the digital infrastructure. If Jumbo Frames are used, you ought to set the appropriate MTU measurement end-to-end, together with the ESX server VMkernel ports for iSCSI traffic, any actual switch ports to which the VMkernel NICs are related, and the Synology iSCSI interfaces.

After configuring MPIO, that you may determine the network utilization in aid computer screen in Synology DSM or efficiency of ESXi host in vSphere client.

Managing performance

In DSM 6.0, which you can view the performance of every iSCSI LUN in resource monitor, together with throughput, IOPS, and latency. Below is an illustration of what you're going to see when viewing the performance of an iSCSI LUN.

Commonly speak me, the bottleneck of iSCSI storage is bound by disk I/O when difficult disk drives are put in, as disk latency is constantly larger than network latency. If the return cost of community latency is just too high, whatever is likely incorrect with the network, and you may examine the community atmosphere (similar to community cables and Ethernet switches) to establish the issue. As for random IOPS workloads, a rule of thumb says the ordinary latency may still be below 20ms when no backup project is in development. in case your latency has been larger than 20ms for a very long time, accept as true with enhancing performance by means of including disks or SSD cache for the iSCSI LUN.

Moreover, you could view the pattern of your workload, including the block measurement and queue depth. This helps you get a perception into the workload of your virtualized ambiance.


In this article, you have got a top level view of evaluating the workload of your virtualized ambiance and planning the efficiency required for Synology NAS. You have also realized how to configure of iSCSI Multipath I/O to make sure the bandwidth of all interfaces for your Synology NAS will also be used at the same time.

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