[Linux] basic lvm operations
Two new hard disks are added for the experiment:
[Root @ jp ~] # Fdisk-l
Disk/dev/sda: 107.3 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065*512 = 8225280 bytes
Device Boot Start End Blocks Id System
/Dev/sda1*1 255 2048256 83 Linux
/Dev/sda2 256 777 4192965 82 Linux swap/Solaris
/Dev/sda3 778 13054 98615002 + 83 Linux
Disk/dev/sdb: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 cylinders
Units = cylinders of
volume is equivalent to a partition in the traditional sense--the advantage is that its size can be resized as needed, as mentioned earlier.In this article, we will create three physical volumes using three 8 GB disks (/DEV/SDB,/DEV/SDC, and/DEV/SDD) respectively. You can either create PV directly on the entire device, or you can partition it before creating it.
Here we choose the first way, if you decide to use the second one (refer to the third pa
The SCSI_ID command emits a SCSI inquiry instruction to the device, accessing the data 0x83 the vital product data (VPD) page, which contains the Wwid and other information of the device, or the data of the page 0x80, which contains the unit serial number Serial number). The execution result of the scsi_id command (a long string of characters) is the wwid of the device and is currently mapped to/DEV/SDC (/SYS/BLOCK/
Tags: RAID set RAID emulation shared hot spareSoftware RAID--disk array with hardware disk array and software disk array, hardware disk array using disk array card to achieve effect, so that multiple disks to form a large disk, to the operating system, only see this large disk but not see those small disk, but the disk array cards expensive, Ordinary users in the learning process can not implement hardware disk array, so there is the use of software to implement the disk array function, the oper
(from the already dead time and again finally hung out of the Baidu space manually rescued, published on 2014-06-24)In order to eliminate the browser to the default CSS settings, keep the Web page in each browser look consistent, the initialization of CSS is very necessary! A lot of the time, the style incompatibility problem can be solved by CSS initialization code. Some common scenarios are listed below:1. The most resource-consuming, simplest2. Selective initialization example (synthesis)Body
; 4 fieldset, img{Border: 0;} fieldset, img{Border: 0;} fieldset, img{Border: 0;} 1. input, select, and textarea also have borders by default. Their borders are not cleared in the Reset based on the idea of graceful degradation. When the background image is modified, remember to clear the border; 5 table{Border-collapse: collapse; border-spacing: 0;} table{Border-collapse: collapse; border-spacing: 0;} table{Border-collapse: collapse; border-spacing: 0;}-6q: before, q: after{Content: ";} q: befo
Web page
When the paragraph label p should be used in the paragraph there are many abuses of the newline label BR, p used to represent the paragraph is recognized. Based on the same logic, many tags should be used to define certain textual elements, such as references, abbreviations, and computer code.
It should be remembered that although most browsers deal with these tags in different ways, it is important to remember that it is not about what the element looks like, but what it gives it.
Init
Sudoapt-getinstalliscsitarget is done immediately, and then edit the configuration file: sudovim/etc/ietd. conf is the default configuration file with detailed configuration instructions and examples. This blog first backs up the file, keeps it for future research, and then clears it and writes the following data: iSNSServer192.168.100.100iSNSAccessControlNoTargetiqn. 2009-04.co
Sudo apt-get install iscsitarget
Immediately, and then edit the configuration file:
Sudo vim/etc/ietd. conf
The defaul
company is ready to build a mail server (RHEL6 system platform) in the Internet, providing e-mail space for employees and some VIP customers all over the country. Due to the large number of users, mail storage needs a lot of space, considering the need for dynamic expansion, plan to add two SCSI hard disk and build LVM logical volume (attached to "/mailbox" directory) dedicated to storing mail data;Experimental steps:650) this.width=650; "title=" MSV@G7L7WCM8KAXWF.png "src=" http://s1.51cto.com
specific narrative. It mainly describes how to add timing constraints to your project and how to perform timing validation. First create an SDC file with the name consistent with the top layer of the project, and then add the timing constraint by following the steps below. 1. Create a clockthe first step in adding a timing constraint is to create a clock. To ensure the accuracy of the STA results, all clocks in the design must be defined and all rele
, or the toolbar icon is as follows:
(2) The compilation result is as follows:
(3) warning analysis and solution:
A) warming (4) is shown in. The specific explanations are as follows:
I. No capacitor Configuration
II. the unused pin is not set to three States. Set assignment-device and pin opitions-unused pins, as shown in:
Iii. No capacitor Configuration
Iv. Ignore
B) Critical warming (5) is shown in. The specific explanations are as follows:
I. No Io is assigned
Burn the compiled u-boot.bin to the SD card (please make sure there is no data in the SD card, this step will make all the data in the SD card or U disk lost !), Enter the U-boot directory on the terminal and run the following command:
Sudo dd If = u-boot.bin of =/dev/SDC
Here, the SD card I used, via card reader, is/dev/SDC on the computer. The specific reason is what varies with the storage devices
Procedure:
Use cfdisk to create two partitions in the USB flash drive, and use the second partition as the boot partition.0: mkfs. ext3/dev/sdc5
1: mount/dev/sdc5/tmp/boot
2: grub-install -- root-directory =/tmp/boot -- no-floppy/dev/sdc (* Note *)
Modify the menu. lst file by yourself. This is simple.**************************************** ************************************All of the above are overturned and rewritten. You must understand the theo
Attaching a CentOS disk to a hard disk and mounting it automatically upon startup
1. First, find the link to the hard disk:
Fdisk-l
2. Next, partition the hard disk.
Fdisk/dev/sdc press ENTER
Enter n, p, 1, and press ENTER twice, and then wq as prompted.
3. view the partitioned disk sdc1
Fdisk-l
4. format the partitioned Disk
Mkfs-t ext4/dev/sdc1
5. Mount after formatting
Mkdir-p/mnt/sdc mount-t
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