Some friends want to use the VirtualBox tool to build a RAC test environment and share the storage division on their personal computers, but they do not know how to use the RAC test environment, the following section describes how to use VirtualBox to build a RAC test environment and share the storage design process.
The process is as follows:
1. Use the vboxmanage.exe tool in virtualboxto create a disk. This tool can be found in the VirtualBox installation directory.
# VBoxManage.exe createh
How to DIY a host? It can meet their own work, the game needs, but also a high value, noise, the most important thing is that the price is cheap, better quality.
This series is to let the machine 0 Foundation of the friends can easily understand, so try to avoid professional parameters
At present, the mainstream solid-state hard disk mainly SATA3 interface, a small part of u.2, m.2, PCIE. The same capacity and different interface solid-state hard drive price difference is very lar
increased, the world's largest single disk capacity reached 1TB, and 400GB and 320GB, such as large capacity has been in the market everywhere, 320GB product market has been quite mature, The price is also very reasonable. (currently on the market, the minimum capacity of hard disk 80GB, the average single GB price of about 4.5 yuan, and 320GB capacity of the hard disk, its single GB price of about 2.4 yuan.) Then, small series from a few major keywords to start, to introduce some hard drive to
Motherboard 8 Krai via kt600 + vt8237, two SATA interfaces, two ide interfaces, one IDE is connected to the hard disk, and the system Windows XP SP2 is installed; the other ide is connected to two optical drives, the master is a pioneer recorder, and the slave is a read-only optical drive.I think a hard disk is not enough because of a lot of movies and music, and I want to buy another hard disk with a larger capacity, it is used to store movies or mus
What to do when the hard drive is not found in the WinXP system installation
Reason Analysis:
The hard drive is not set correctly in 1.BIOS
If you do not set the hard drive parameters correctly in the BIOS, you will be prompted to not find the hard drive when you install it.
2. Hard Drive cable Loose
The hard drive will not be properly recognized when the computer is turned on due to loose hard cable connections.
Solution:
1 manual identification of the hard drive in the BIOS
Step 1: Aft
Reason Analysis:
The hard drive is not set correctly in 1.BIOS
If you do not set the hard drive parameters correctly in the BIOS, you will be prompted to not find the hard drive when you install it.
2. Hard Drive cable Loose
The hard drive will not be properly recognized when the computer is turned on due to loose hard cable connections.
Solution:
1 manual identification of the hard drive in the BIOS
Step 1: After restarting the computer, press the corresponding key according to the Scree
First of all, your hard drive is larger than 200G, and is stat hard drive, because most u disk PE system on stat hard disk support is not very good, so the situation will occur, the solution is as follows:
1, first after inserting a U disk, boot into the BIOS to modify the settings, view is denied to the U disk, or directly on the boot press F9 or F10, F11 motherboard, setting is not the same as the boot sequence settings, and then use the old peaches or the morning maple u disk start, do not e
want the drive to vibrate during operation,The computer's vibrating magnetic arm can also vibrate, and the head may touch the track,And the disc has been spinning, it is possible to scrape the disc.We want the hard drive to maintain a stable working state.The hard disk is actually a mechanical device, only a minute to turn 10,000 rpm,While Pathfinding is a mechanical work, the main time to fetch data from a hard drive is spent on seeking the road.Read data consumption time from hard disk: Maxim
(display unit)-s (only statistics directory itself) File|dir # # # #统计文件大小(3). When the following problem occurs when the device is uninstalled[Email protected] ~]# umount/mnt/Umount:/mnt:target is busy.(In some cases useful info about processesThe device is found by lsof (8) or fuser (1))UseFUSER-KVM Device | mount point-K kill,-V show details,-m scan deviceLsof Equipment | mount pointTo find the process that consumes the device2. Soft and Hard linksLs-i # #查看文件节点号Ln-s/file/file1 # #软链接Ln/file
level for certain differential standards. If it is not used, it can be used as I/O.6. DATA0Dedicated input feet. In the as mode, the configuration process is: CII will NCSO low level, configuration chip is enabled. CII then works with DCLK and ASDO, sending commands to the operation, and reading the address to the configuration chip. The configuration chip then sends data to CII via the data pin. The DATA foot is attached to the DATA0 foot of the CII. After the CII receives all the configuratio
CII receives all the configuration data, it releases the conf_done foot (i.e. not forcing the conf_done foot low) and the Conf_done foot is open-drain (open-drain). At this point, because the conf_done is externally connected with a 10K resistor, it becomes high. At the same time, CII stops DCLK signals. After the conf_done becomes high (and then it becomes an input pin), the initialization process begins.Therefore, conf_done this foot outside must t
early on , so you can use pipelining regardless of the version. Here is an example of using netcat: $ (printf "PING\r\nPING\r\nPING\r\n"; sleep 1) | nc localhost 6379+PONG+PONG+PONGThis time we is not paying the cost of RTT for every call, but just one time for the three commandsNot every call spends one RTT time, but one RTT time executes 3 commands. To is very explicit, with pipelining the order of operations of our very first example'll be the following:Obviously, thepipelining process is
What is SAS?
SAS is a new generation of SCSI technology, and the popular Serial ATA (SATA)Hard DiskSimilarly, serial technology is used to achieve higher transmission speeds and improve internal space by shortening the connection lines. SAS is a new interface developed after the parallel SCSI interface. This interface is designed to improve the efficiency, availability, and scalability of the storage system, and is provided with Serial ATA (Serial AT
Nothing left to worry about. A raid 0 is set up, and the speed is improved significantly. The speed of loading games and starting programs is improved.
First, let's make a comparison.
Single-disc speed:
Raid0 speed:What about the hard disk used? Two Seagate GB single disk
STEP/Method
1
Next let's talk about the steps, because the Board is not the same, enter and set the method is different, the following take my P55A-UD3R as an example, intel board settings are basically the same:First, when
Step method
1, the following said steps, because the board is not the same, enter and set the method is different, the following to my p55a-ud3r for example, the Intel board settings are basically the same:
First after the power is opened B I o s in the P O s T, press the
"integrated peripherals" the "pch SATA contrp mode" option to "raid (XHD), exit the BIOS program settings and save the settings results.
The following figure
2, and the
the raid (as per your preference or RAID user);
Set the block size, and then save the settings;
Load drivers by operating system after RAID Setup
The operating system is successfully installed and finished.
Siliconimage
The main board used 3112, 3114, 31,323 models of the controller, the corresponding model is as follows:
Although there are three different models, the BIOS settings are roughly the same as the raid BIOS interface, but the supported RAID modes are slightly different
involves a dual-channel memory problem, most ATX motherboards will be divided into two different colors of 4 memory slots, usually divided into two colors, adjacent to the different color of the two root cuttings groove to form a memory channel, the construction of dual-channel memory requires two memory inserted in the same color of the memory bar can build dual-channel memory.
It should be noted that the memory channel speed depends on the speed of the slowest memory module insta
A certain day of the month, is a friend to start a new SATA hard drive that day, I am alone in the computer city outside the platoon irresolute, met this gentleman, came to ask me: "Sir has for my new hard drive and the old hard drive mixed raid write a little what not?" "I said no," he told me, "Sir, write a few, many friends need to read the article of the Gentleman"
The above is not responsible for the words of the preface
What is mixed raid
To
button is pressed, the system resets again, if it is released and then pressed, the system will reset. It is possible to control the reset of the operating system by disconnecting and closing the keys.Why is the reset when bootingIn the circuit diagram, the size of the capacitor is 10uF, the size of the resistor is 10k. So according to the formula, we can calculate the capacitance to charge toThe supply voltage is 0.7 times times (the SCM power is 5V
domestic high-profile three recruitment sites, respectively , 51Job, Zhaopin and Hook network. Search keywords Unity3d, statistics of the last 2 months nationwide issued by the relevant recruitment, and the monthly wage range is divided into 2k, 2k-5k, 5k-10k, 10k-15k, 15k-25k, 25k-50k, 50K and above several levels, The results are as follows (statistical results are not based on work experience , age and
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