DPM 2016 Database Bug

Hello All

Update this is a Windows Defender issue not a database issue. http://jtpedersen.azurewebsites.net/index.php/2017/07/06/windows-defender-issue-on-windows-server-2016-with-dpm/

This will be short, There seams to be a bug in the DPM 2016 database once it reaches a certain size or number of recovery points. We have 2 setup around the same time and both failed within 2 days of each other. The symptoms where backups just standing still not doing anything and if i open resource monitor of perfmonitor it would be slow and sluggish.

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RoCE/RDMA/DCB what is it and how to configure it

You have probably heard these acronyms somewhere, so what are these and are they the same. In short yes and no

RoCE stands for RDMA over Converged Ethernet, the RDMA part is Remote Direct Memory Access.

RDMA allows for network data(TCP packets) to be offloaded on the Network cards and put directly in to the memory, bypassing the hosts CPU. Allowing for the host to have all the access to the CPU. In normal TCP offload all the network traffic goes trough the CPU and with higher speeds will take more CPU. On a 10gbit network it would take about 100% cpu on a 12 core Intel Xeon V4 CPU. Read more

Enable DCB on Dell N4000 and Dell Force10 S6000-on

In my plans for our Dataon S2D-3212 setup i had plans on using our Dell N4000 switches for DCB/RDMA, as we have this in both our datacenters. When i did our first install i had problems when enabling DCB with no-drop on the N4000. The N4000 was running firmware version 6.3.2.3 and we where loosing connectivity to some servers when no-drop was enabled. So we ended up buying some new Dell Force10 S6000-on switches, as the Nic’s in our servers are Mellanox ConnectX-4 40Gbit cards. Read more

Storage Spaces Direct Monitoring with Dataon Must

Hi everyone

Last week Dataon officially released there monitoring system for there S2D offering. Dataon Must, it is at the time the only S2D monitoring software out there. There is management packs you can add to SCOM to get alerts and stuff in there. There is also one made for MOMS. Take a look at Stanislavs post about it here. Other then that there is nothing else.

This post will be all about the pictures and not so much about the writing 🙂

Dataon Must is only available with Dataon S2D hardware. As of what i know, it will not be available with non Dataon S2D clusters. When you get this solution it’s delivered as a finished setup. You get a vhdx file to import as a virtual machine. Import it, give it 4gb of ram and min 2 cpu and you are good to go. It’s a Win 2016 server and running a IIS website. Setting it up is quite simple and is done in minutes.

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Dataon S2D-3212 HyperConverged Cluster

Updated 27. feb

We have been testing Storage Spaces Direct for a while on our Ebay cluster. We have been running development and some production systems. As the 2nd exchange node, a mediation server and our vmm server.

We have been looking to replace our current Hyper-V solution that consist of HP BL465c G8 and  BL490 G7 blade servers attached to HP P2000 G3 MSA over iscsi. This has been slower and slower as we have setup more virtual machines. This was a 12 disk shelf with 11 disks active with one spare. One 15k disk gives about 170 iops, giving a whopping 1870 iops on max speed. On normal load it would use about 1200-1500  IOPS so not a lot of spare IOPS. We had one pr cluster.

Most of you know what S2D(Storage Spaces Direct) is, if you don’t go look at Cosmos Darwin’s post over at Technet to get some good insight about S2D.

What i am going to focus on in this blog is the new Dataon HyperConverged server. Back at Ignite 2016  Dataon released there first offering the S2D-3110 all flash solution pumping out 2.6 Million IOPS in a 1u form factor. Read more

How to replace a NVME Caching device on a Storage Spaces Direct Cluster

After my initial failure of replacing a NVME Caching card and hitting a bug in the 2016 version i was on, i replaced another one today. As we where starting our cluster out with Intel 750 drives, and these NVME PCIe cards only have 70gb of write’s pr day. So i decided to replace them with the Intel DC P3600. The first failed as can be seen here.

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Troubleshooting failed VirtualDisk on a Storage Spaces Direct Cluster

In this guide i will explain what you can do to fix a failed virtualdisk in a Failover Cluster. In S2D the ReFS volume will write some metadata to the volume when it mounts it. If it can’t do this for some reason it will jump the virtualdisk from node to node until it’s tried to mount it on the last host. Then it will fail and you will get this state in the event log and the Virtual disk will be failed.

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