Simply passing of USB device to qemu virtual machine usually works well. I had no troubles passing most of devices, but passing of USB-modem gave me a headache. VM got the following error during boot: -110 code is not meaningful and I started to dig into host’s logs. This is a sample of dmesg logs. …
How to pass-through RNDIS USB dongle from host to virtual machine. Read More »
A while ago a faced a problem with USB modem. There were tons of similar error messages during boot and due to udev spamming, the boot process took VERY long. The message looked like so: The reason is USB dongle, which hides in itself multiple devices, including flash storage device with drivers. The storage device …
“Buffer I/O error on dev sr0, logical block 0, async page read” when using USB dongle Read More »
In GPDB 5x, table’s data can be distributed RANDOMLY or by set of columns. The essential parts of column-based distribution are: hashing target segment number calculation I will try to dig into them in this article. To hash, or not to hash (on dispatcher), that is the question. Based on logic and common sense, you …
About distribution, hashing and target segment number calculation in GPDB 5x. Read More »
You can be surprised how much disk space Docker images can consume. In this article we will look at several ways of how to minimize your Docker image. We will build an image with Dante socks server as an example. Dante will not be installed from binary packages, but will be compiled by ourselves inside …
My new OpenSource project. A fast hybrid of Reverse Proxy and Deep Packet Inspection (DPI) written on C.Unlike classic Reverse Proxy, it can redirect client requests to multiple backend servers behind ONE port.The right backend server is selected on-the-fly using DPI of protocol negotiation phase. After selection MPServer acts like a classic Reverse Proxy.In case …