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Managing LVM
ByQ AAny tutorials or tips on how to manage LVM? LVM provides a flexible and easy way to management storage disks on Linux. It also provides a set of tools for management. Here are some tutorials and references for managing LVM: LVM man pages: https://www.systutorials.com/docs/linux/man/8-lvm/#lbAL Manage Disk Volume in Linux: http://www.hongkedavid.com/blog/disk_volume.html LVM with Xen: https://www.systutorials.com/b/linux/tag/lvm/ Remove missing phyiscal volumes…
How to set Internet Explorer’s Proxy in command line on Windows 7?
ByEric MaHow to set Internet Explorer’s Proxy in command line on Windows 7? You can use this tool: SetProxy. On Windows 7, it works still to set IE’s proxy. Note that the proxy setting is for IE only. If you need to configure the proxy for other services like Windows Update or other programs that use…
How to Find Out Failed Disks’ SATA Ports in Linux
ByEric MaThe Linux disk names (e.g. sda1, hdb3, etc.) are not reliable—they may be changed if there are hardware changes, such an adding or removing a disk. Additionally, the order for the Linux device names is not always the same as the order of SATA poets. For example, the disk connected to SATA port 0 (first…
How to detect whether an image is almost blank on Linux?
ByEric MaHow to detect whether a .jpg image is almost blank/black on Linux? Here is a bash function that I used to detect whether an image is black on Linux: function isBlank () { mean=`convert $1 -format “%[mean]” info:` echo “$mean” } It uses ImageMagic to generate formatted image characteristics (the mean). If the mean is…
Too many TCP segments retransmited in a virtual machine
ByQ AI find there are too many TCP segments retransmited in a Xen virtual machine. sudo netstat -s | grep segments 537559 segments received 558908 segments send out 3533 segments retransmited 2677 bad segments received. There are 4 VMs on a host which has 4 cores. The segment retransmision rate is too high. It finally turns…
How to Get Rid of DTS/AC3 Audio using ffmpeg on Linux to Play MKV Files on iOS or Android
I encountered the problem on iPhone that MKV video files with AC3 are played with no sound. The OPlayer reports to me that “According to DTS patent, DTS is forbidden to play , None of the media player on iPhone/iPad can play DTS”. However, the video file can be played in MPlayer on Linux just…
