How to Remotely Control Your PC (Even When it Crashes)
https://www.intel.com/content/www/us/en/support/products/54995/technologies/intel-vpro-platform.html

KVM (Keyboard Video Mouse)

Intel AMT KMS

Intel vPro is a management platform built into Intel processors and other hardware that allows companies to manage their desktops and laptops out-of-band (OOB). That means the computers can be managed no matter if the computer in on or off, and even if the operating system has failed or there is no hard drive present.

With Core processors Intel introduced Active Management Technology (AMT) 6.0 which introduced a slew of new features including Keyboard Video Mouse (KVM) Remote Control.

Intel AMT KVM runs at a hardware level which allows you to go remote with your computer in the case of a total system failure or even without an operating system installed.

Determine if Your Computer Supports Intel AMT KVM

Because vPro is designed for business use, not every Intel processor supports Intel AMT KVM. Specifically what you want to look for is a vPro logo somewhere on your computer.

Note: Only some Core i5 and i7 processors support vPro. Intel does not currently make an i3 processor with vPro.

image-20200727163413414

https://www.moerats.com/archives/230/

How To Create A NAS Using ZFS and Proxmox (with pictures)

Seedbox Theory:
The lowest resource utilization (read: excellent performance) seedboxes use rTorrent 48 with the ruTorrent 38 web interface over FCGI 13 (e.g. PHP) on Apache 1 or nginx 2. Most mid-range seedboxes with good performance (read: human configurable) typically use Transmission 15 or Deluge 12 instead. Lower performance, and very user friendly, seedboxes typically use uTorrent v2.2.1 2 (Windows only) or qBitTorrent 4 (cross platform). While other 4 applications 2 may support the BitTorrent 1 protocol, they are not appropriate for seedboxes. Except for rTorrent, modern seedbox quality BitTorrent clients have integrated web interfaces that offer basic functionality.

For the purposes of this tutorial, Quickbox 180 software will be used. It is essentially a well supported push-button style installer script for rTorrent/ruTorrent hosted on Github for Debian/Ubuntu. The notable features are that it actually works, unlike literally 18 everything 13 else 14, including 10 manual setup 19. An honorable mention is that while it cannot run natively, the docker version 14 of rTorrent looks promising, but non-native means it would be better to just use Transmission instead.

In case Quickbox dies at some future date, the landscape’s alternatives should now be clear.

Quickbox Resources:

Further Reading:


Quickbox Command Reference:


  • reload – Alias that restarts the seedbox services, i.e; rtorrent & irssi.
  • fixhome – Quickly adjust /home directory permissions.
  • showspace – Shows amount of space used by each user.

  • createSeedboxUser – Creates a shelled seedbox user.
  • deleteSeedboxUser – Deletes a created seedbox user and their directories (permanent).
  • changeUserpass – Change users SSH/FTP/deluge/ruTorrent password.
  • setdisk – Set your disk quota for any given user (must be implemented seperately 15).

  • upgradeDeluge – Upgrades deluge when new version is available.
  • upgradeBTSync – Upgrades btsync when new version is available.
  • upgradePlex – Upgrades Plex when new version is available.
  • upgradeJacket – Upgrades Jacket when new version is available.
  • upgradepyLoad – Upgrades pyLoad when new version is available.
  • setup-pyLoad – installs pyLoad
  • quickVPN – Something about VPNs.
  • removepackage-cron – upgrades your system to make use of systemd + (must be on Ubuntu 15.10+ or Debian 8)
  • clean_mem – flushes servers physical memory cache (helps avoid swap overflow)

Of note here is that Quickbox does not support multi-user configurations on a vanilla install. Care must be taken to manually ensure each rTorrent session is unique, with unique FCGI ports, and to set up disk quotas properly. A lazier alternative is to use containers/VMs to support multiple users and implement quotas using ZFS instead.

As root in the seedbox container…

1
2
3
4
5
whoami
cd ~
apt-get -yqq update; apt-get -yqq upgrade; apt-get -yqq install git lsb-release
git clone https://github.com/QuickBox/QB /etc/QuickBox
bash /etc/QuickBox/setup/quickbox-setup

Xen Project hypervisor
Hyper-V虚拟机的物理设备直通(Discrete Device Assignment, DDA)与显卡直通实践
Kernel Virtual Machine https://www.linux-kvm.org/page/Main_Page
https://planet.virt-tools.org/ Blogging about open source virtualization

模拟

平台虚拟化

操作系统虚拟化

hypervisor

image-20200727105448883
早期的虚拟化模型被称为Type 1,或者叫本地虚拟化(native virtualization),这种模型下hypervisor直接运行在硬件之上,在hypervisor上面是虚拟机
主机虚拟化(hosted virtualization)模式,被称为Type 2,hypervisor运行在操作系统之上,在同一平台上允许两个或更多的操作系统共存

闭源的 VMware ESXi 还是开源的 KVM

Nutanix 的 AHV(基于 KVM),同样支持 VMware 虚拟化计算平台

VMware 的 vSphere(基于 ESXi)

SmartX 的 Elf(基于 KVM),同样支持 VMware 虚拟化计算平台

KVM 作为开源的 Hypervisor 被很多厂商选用,但各家需要实现自己的虚拟化计算管理平台,除了基本的 VM 生命周期管理,还至少需要实现企业级常用的功能,如:VM HA、、虚拟分布式交换机、共享盘等

硬件虚拟化 或者叫做平台虚拟化

硬件虚拟化:完全虚拟化( full-virtualization)和半虚拟化(para-virtualization)

image-20200727142740272

Citrix的Xen

可以同时执行Type1和Type2型hypervisor,Amazon的EC2就采用Xen来进行服务器的虚拟化。

KVM

hypervisor是Linux Kernel Virtual Machine(KVM),支持本地虚拟化和主机虚拟化模型。

KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko.

KVM是通过夹在内核模块可以对Linux内核进行小的修改,从而变成一个全特性的hypervisor。KVM通过应用virtio可以支持半虚拟化,在Guest系统中包括用于半虚拟化的标准Linux驱动。

KVM is open source software. The kernel component of KVM is included in mainline Linux, as of 2.6.20. The userspace component of KVM is included in mainline QEMU, as of 1.3.

KVM也是第一个完全集成在主线内核(mainline kernel)的hypervisor,由Rad Hat开发。

无论是完全虚拟化还是半虚拟化,都应用了硬件协助虚拟化(hardware-assisted virtualization)。新的AMD和英特尔CPU都集成了优化hypervisor的指令集,来增强Guest虚拟机的I/O性能。

操作系统虚拟化

操作系统虚拟化是另外一个重要的虚拟化技术,正如其名,是对操作系统本身进行虚拟化,而不是平台。在这种方式下,操作系统提供一组用户空间(User-Space userland)彼此隔离,而应用被限制在每个用户空间里面,就好像一个独立的主机。这种形式的虚拟化在虚拟主机环境中非常流行,让多个独立的用户可以共享一个操作系统。

image-20200727143126481

操作系统虚拟化依赖于可以创建和隔离用户空间(或者叫做容器或者私有虚拟服务器)的Linux内核,OS虚拟化最大的好处在于几乎没有任何开销,因为用户只是简单的共享OS和主机,而不需要通过虚拟机。而缺点在于目前我们采用的OS虚拟化解决方案缺乏灵活性,不能在任意的操作系统上实施,用户共享主机和操作系统还需要注意版本。

Linux包含很多的操作系统解决方案,具有很高的可配置性。比如OpenVZ、Linux-VServer和FreeVPS是其中三个最流行的,均支持CPU、内存网络、I/O和存储配额配置,OpenVZ还支持主机之间的在线VPSes迁移。

Linux 模拟器

Linux中最流行的两个模拟器(emulator)包括QEMU和Bochs(处理器和平台模拟器)

QEMU通过动态编码转换的模拟方式,让内核和内部用户代码可以被加速。另外,QEMU是一个很好的嵌入式平台开发工具,可以为与主机相异的CPU开发和测试代码。QEMU还可以被用来其他虚拟化解决方案来进行设备模拟

Refer:

BSD的故事 https://wiki.freebsd.org/Myths
FreeBSD is UNIX from the ‘90s
FreeBSD is good for servers, not for Desktop
that OS X is just FreeBSD with a pretty GUI
FreeBSD Makes Me Compile Everything From Sourc
DTrace and ZFS All of the Good Bits of FreeBSD Come from Solaris
iXsystems, a company that supports FreeNAS
FreeBSD Has No Drivers
After 4.x FreeBSD Went Downhill
FreeBSD Lacks Software
FreeBSD Does Not Support Virtualisation
BSD license VS GPL The BSD License Means Companies Don’t Contribute Back
ZFS on Linux project
https://itsfoss.com/why-use-bsd/
有没有人现在用FreeBSD用于生产环境的?

DS918+ DS920+
CPU Intel Celeron J3455 Quad Core 1.5 GHz (up to 2.3 GHz) 2 MB Cache Intel Celeron J4125 4-core 2.0 GHz burst up to 2.7 GHz 4 MB Cache
Benchmark 2153 3035
Socket FCBGA1296 FCBGA1090
GPU Intel HD Graphics 500 250 – 750 MHz (8GB) Intel UHD Graphics 600 250 – 750 MHz (8GB)
RAM DDR3L 4GB Non-ECC SO-DIMM (1 slot free) 1866 MT/s (Upgrade up to 8GB) 1X 4 GB DDR4 (expandable up to 8 GB) 2400 MT/s
RAM slots 2X 1X
Cache 2 x M.2 2280 NVMe SSD (drives not included) 2 x M.2 2280 NVMe SSD (drives not included)
External port • 2 x USB 3.0 port • 1 x eSATA port • 2 x USB 3.0 port • 1 x eSATA port
LAN 2 x Gigabit (RJ-45) 2 x Gigabit (RJ-45)
Encryption Yes (AES-NI) Yes (AES-NI)
Power 28.8W/ 4.25W 32.17 W / 9.69 W
Noise value 19.8 dB(A) 19.8 dB (A)
Codec h264 Decode / Encode Decode / Encode
Codec h265 8bit Decode / Encode Decode
Codec h265 10bit Decode NO
Codec VP8 Decode / Encode Decode / Encode
Codec VP9 Decode Decode / Encode
Codec VC-1 Decode Decode
Codec AVC Decode / Encode Decode / Encode
PLEX HD Yes (mostly) Yes (mostly)
PLEX 4K Yes (without transcoding) Yes (without transcoding)
Native 1080p Yes (Mostly) Yes (Mostly)
Native 4K Yes (Mostly) Yes (Mostly)
VM Support Yes, Depending on Memory Allocated Yes, Depending on Memory Allocated
Containers Yes, Depending on Memory Allocated Yes, Depending on Memory Allocated
File System EXT4 and BTRFS EXT4 and BTRFS
Backup Types NAS-to-(NAS,PC, Mac, Mobile, USB, Cloud) NAS-to-(NAS,PC, Mac, Mobile, USB, Cloud)

[TOC]

Wiitek SFP+ to RJ45 Copper Modules, 10GBase-T Transceiver Compatible for Cisco SFP-10G-T-S, Ubiquiti, D-Link, Supermicro, Netgear, Mikrotik, Unifi (Cat 6a/7, 30-Meter)

MikroTik 5-Port Desktop Switch, 1 Gigabit Ethernet Port, 4 SFP+ 10Gbps Ports (CRS305-1G-4S+IN)

ROS 3865U

GC110

image-20200728163723652
ROS消费级企业路由器RB1100AHx4,LACP链路聚合
https://www.benq.com/en-ap/projector/cinehome-home-cinema/w1120.html
https://www.benq.eu/en-dk/projector/cinehome-home-cinema/w1120/specifications.html
https://www.benq.com/en-ap/projector/cinehome-home-cinema/w1120.html
https://www.benq.com/en-ap/support/downloads-faq/products/projector/w1120/faq.html
https://www.benq.com/en-me/support/downloads-faq/products/projector/w1120/faq.html
https://www.benq.com/en-ap/support/downloads-faq/products/projector/w1120/manual.html
https://www.benq.com/en-ap/support/downloads-faq/products/projector/w1120/manual.html
明基(BenQ)Qcast Mirror 无线投屏器 2.4G/5G双频 高清 投影仪同屏器hdmi视频传输器 苹果安卓 无线同屏器
https://www.projectorcentral.com/projection-calculator-pro.cfm
img
这款机器本身可以直接放桌子上面使用,也可以购买吊架吊装使用。留一根HDMI线可以外接电脑或者电视盒子。本身内置音箱,如果要外接音箱的话,可以再留一根3.5mm音频线用来连接音箱哦
投影仪距离幕布越远,画面越大; 如果先确定画面大小,就能得到投影仪距离幕布的最小和最大距离;如果先确定投影仪距离幕布多远,就能得到画面尺寸。
机器安装高度具体根据您幕布高度来定哦img 机器正放的话,镜头对着幕布下沿;机器吊装(机器要倒置)的话,镜头对着幕布上沿~
img
img

除湿机 抽湿机

https://item.jd.com/100000117862.html 我们商品原厂配件是不带水管的,您有需要的话可以自行附近市场购买呢,水管内径是16mm

香港对除湿机需求量大,产品也非常领先,加上无需变压器和汇率优惠等因素,人肉带回,其他地区可以选择马云家代购。当地购买可以选择百老汇等连锁,想更便宜可以考虑上Price上找店铺。

香港出售的松下压缩式除湿机全线台湾制造,遗憾的是上一代产品,没有10倍纳米水离子、空净版没有PM2.5数显,同时安全防护减至15项,最大型号由22L降至18L(27℃,湿度60%),能耗也高了。但以上说的都是小问题,松下仍是220V里最好的除湿机之一。KDK有同款且价格更低,不介意logo的不二选择。

https://www.price.com.hk/buying-guide/dehumidifier-review

由于中高端的除湿机都要四五千元,所以建议除湿需求大且预算充足的朋友考虑带热除湿的空调(富士通Z、松下VE、三菱电机AHJZHJ),节省空间,更安静,虽然预算更高但与增加一台高端除湿机相差无几。

https://post.smzdm.com/p/apzexrx9/

大体上分为两类:压缩机式和热石式。虽然热石式除湿机的优点在于受温度湿度影响小、体积重量小、噪音小。但现在市面上的压缩式除湿机较为主流。鉴于我家的使用环境。还是在主流机型里面挑一挑吧。对于小家电,日淘总会有巨大的价格和技术优势,只是运费方面有些小贵,在日亚上面看到了三菱2016年的旗舰:MJ-180LX。

Lexar 3 in 1 card reader

https://www.lexar.com/cn/portfolio_page/professional-multi-card-3-in-1-usb-3-1-reader/

SAMSUNG 256G SD card 测试

image-20200709100757656
image-20200709100301706
http://www.starjade.cn/product/lexar.html
SD 优势是大文件 顺序的读写
SSD 优势是4K random access
image-20200709103204686
image-20200709103807002
random access image-20200709104559291
image-20200709104745592
image-20200709104203464
image-20200709104256997

When to use VDI, server-based computing, and how Citrix Ardence dynamic desktop fits into all this
Citrix HDX
XenDesktop.&text=In%20other%20words%2C%20the%20difference,a%20desktop%20or%20an%20application.](https://www.lakesidesoftware.com/blog/what-xendesktop-explaining-difference-between-xenapp-and-xendesktop#:~:text=The main difference is how,SBC (Server Based Computing).&text=In other words%2C the difference,a desktop or an application.))
https://www.citrix.com/zh-cn/glossary/what-is-desktop-virtualization.html