These days I had to troubleshoot a problem in a vCenter environment. A few VMs shown with absolute path to vmx file in vCenter inventory. Normally this occurs when a ESXi boots with no connection to its previous mounted storage volumes. VMs located on these volumes are shown like this in inventory. But this wasn’t the case here: VMs were running and no host was […]
First, what does active/standby mean. For this blog post, it means the array hast at least 2 controllers, one presents ALL LUNs to the hosts, the second controller presents NO active LUNs path to the hosts. Just in case of a manual or automatic failover, the second controller takes-over ALL LUN-presentations – and active paths. Examples of such arrays are: [very old one] HP MSA 1000 HPE Nimble […]
Normally when using a self-signed certificate you get a warning. It is also normal to accept the certificate to continue your task. These days I wanted to register a 3PAR system as storage provider in vCenter. Because of a certification error, this could not be accomplished. In this post I describe how to solve – at least my – problem.
Recently I had to investigate an interesting behavior of ESXi hosts during Storage vMotion between two arrays of the same vendor – in this case HDS (G600 –> G700/F700). In this post I list observed symptoms and a very simple way to boost performance in this situation.
When implementing new storages or configure existing ones it is a good idea to check paths (state and amount) to volumes. When operating a few hosts using a few datastores this can be a very time-consuming task when using the GUI. Therefore I wrote the following function.
FC AFA (all flash array) 3PAR systems show quite a good latency on reads and writes. When operating an iSCSI AFA 3PAR it could happen that the systems show a rather high write latency on ESXi hosts. In this post you can read how to fix this.
Some time ago differentiation between PDL (Permanent Device Loss) and APD (All Path Down) was introduced to vSphere. In a PDL situation, the hosts does not expect the device to return. PDL happens for example, when an administrator un-presents a LUN from a host. APD on the other hand is completely unplanned. By default the host tries to get the device back. Starting with vSphere […]
With SANsymphony-V10 PSP4 DataCore introduced VMware VVOL support. In this post I write about the installation and administration of this feature. This is also a very nice way to take a running VVOL implementation on a notebook with you.
With November 2015 public CAs do not issue new certificates that uses internal names or reserved IP addresses in subjectAltName or in commonName. Furthermore such certificates will be revoked on October 1st, 2016. Internal names are hostnames that do not end with an Top Level Domain ending (.com, .de, …). For example: .local, .internal. Also NetBIOS names without any domain extension are affected. Reserved IP addresses are defined […]
get information using esxcli esxcli vsan storage list details on physical devices esxcli vsan policy getdefault details on default policy, most often referred as “none” for cliesx vsan reference click here convince the host that there is a SSD (if there is a really one) search for the SSD using: esxcli storage nmp device list you will get a satp-type and a device-id. The satp-type can be […]