lsi jbod

, independent of the San and NAS with a lot of hard disk to do large scale scaling.hadoop is also developed on the basis of the same horizontal expansion concept. So is Hadoop using today's popular blade servers, Sans, and virtualization technologies to improve performance like traditional services? Not really First, the features of Hadoop operations. Hadoop is very sensitive to IO performance and there will be a lot of IO operations in the process. Hadoop does not require RAID, instead, using

) is also known as RAID 0 + 1, a solution that combines storage performance and data security. It provides the same data security as RAID 1, and the storage performance is similar to RAID 0, but the storage cost is high. Take four hard disks as an example, that is, each hard disk is a group, each group stores the same data, and the two groups of data are split by a group of data. jbod, also known as spanning, is composed of hard disks of different cap

HDFS File System Optimization 1. System Perspective Storage Method. namenode adopts raid1 + 0, and datanode adopts the disk group jbod mode. In the scenario of sequential file reading, such as mapreduce, you can adjust the size of the file system pre-read cache. Set noaptime and nodiratime for File Mounting to improve File System Performance 2. HDFS Parameter Optimization DFS. namenode. handler. Count (the default value is 10 and the value is 64)DFS.

settings of the raid control card. When we install the raid control card and connect the two hard disks, the following figure will appear when the system starts up.Select "1. Set RAID configuration" in the menu and press the Enter key to go to the "set RAID configuration" page. The RAID Controller will use a period of time to identify the hard disk. Then, move the cursor to the hard disk, press the Space key to select the disk, and press the Enter key to confirm the selection, A new window is d

1. What is raid0? Raid0, which divides data into several halves and writes data to multiple disks A: A1 A2 ...... Performance improvement. At least two disks are required. Merge multiple disks into a large disk with no redundancy and parallel I/O, with the fastest speed. RAID 0 is also called a zone set. It associates multiple disks to form a large disk. When storing data, the data is segmented by the number of disks and written into these disks at the same time. Therefore, RAID 0 is the fastes

disk and Add to Array-> Accept DG-> next; (Note that if the disk is JBOD before, change it to Make Unconf Good !!!! This step is required; otherwise, the disk cannot be selected later !!!) 11. Add to SPAN-> next12. enter the raid0 option. Here, you only need to enter a select size (set the available space of raid0 in upper case). According to the green font prompt on the right, there will be available space for the current disk, therefore, when the s

: Linear: similar to Jbod. The storage space of multiple disks can be spliced together and used as one disk. Mirror: similar to an image. Snapshot: Like a VM, a Snapshot can retain the status of data when a Snapshot is created. A snapshot is another path for accessing the same data. (Mainly used for data backup) Multipath: multi-path. The multi-path must be configured by the DM module, so that the path of the data storage device can be searched throug

extend volume. 650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M02/30/88/wKioL1OoMISCyQZlAARjSwpOfLk228.jpg "Title =" image44.png "alt =" wkiol1oomiscyqzlaarjswpoflk228.jpg "/> 47. Enter a value (for example, 27.9 GB) in the maximum value and click OK. 650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M00/30/88/wKioL1OoMJXBrlZmAARinaKRpMU675.jpg "Title =" image45.png "alt =" wkiol1oomjxbrlzmaarinakrpmu675.jpg "/> 48. confirm that the disk has additional available space. (I

RaidPerformance of disks 1.定位 2.旋转 3.命令队列 4.数据库传输HBA: Host-based adapterRaid:redundent array of inexpensive Disks inexpensive disk arrayIndependent Standalone disk arrayLevel: Only used to identify the different ways of disk composition, can not replace data backup raid0：提高读写性能，没有容错能力。至少需要两块磁盘 100% raid1：至少需要两块硬盘，镜像，硬件容错能力，读性能提升，写性能下降 50% raid4：至少需要三块硬盘，允许一块盘出错，读写性能提升，（n-1）/n raid5: 至少需要三块硬盘，允许一块盘出错，读写性能提升，（n-1）/n raid6: 至少需要四块磁盘，允许两块盘出错。读写性能提升，（n-2）/n raid10：至少需要四块磁盘。允许不同组内个各坏一块盘，读写性能提升

up.In order to prevent change, just a copy of the data two copies, this technology is mirrored mirror. Another technique is the cyclic redundancy check code (RAID4), which is not used to store data on the disk, but the check code on this disk, when one of the bad, the use of checksums and other disk data to recover the data on the broken disk, so that the disk utilization is good, But a two-piece hard drive would have been a terrible break. A rich enterprise, two technology combined.Because eac

, therefore has the redundancy4. Disk space utilization is (n-1)/nRAID50: Combines the disks first into RAID5, and then the combined RAID5 Group is synthesized RAID0650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/39/54/wKiom1O4zeWC7bOvAAFAg9dhsA0435.jpg "title=" R50.png "alt=" Wkiom1o4zewc7bovaafag9dhsa0435.jpg "/>RAID50 will have the following characteristics:1, because of the reason of RAID5, so need at least 6 disks to combine into RAID502, because there is the same bit check code,

: Available Space utilization: (n-2)/n At least 6 bucks. JBOD: To combine multiple small discs into a single market Performance: None Redundancy capability: None Space utilization: 100% At least 2 bucks.Logical raid: /dev/md# /dev/md1 /dev/md2 /dev/md3Md:Mdadm: Make any block device raid Modal Commands: To create a pattern: -C Dedicated options: -L: Level

performance is also significantly enhanced. Supported by RAID capabilities, AL-7121A's support for RAID is quite comprehensive, supporting not only the common raid levels of 0, 1, 3, 5,10, 6, 60,nraid, but also the current very popular JBOD to ensure that different enterprises, Different businesses offer a wide range of applications and performance-intensive storage services. Soft and soft, safe and reliable Whether the product is safe and reliabl

background, the LUN can be protected by the raid level of the array, or it can be a collection of unprotected storage (JBOD). ********************************************************************************************************* Asmlib and Udev Both Asmlib and Udev solved the problem of fixed device names. In Linux, the order in which devices are detected and enumerated is not fixed. This is not the same as in Solaris, for example, unless a disk

: Improved read and write performanceRedundancy capability: AvailableSpace utilization: (n-1)/nAt least 3 pieces of diskHow the RAID10 works:RAID10 organizes the array in a way that mirrors first and then strips back.Performance: Improved read and write performanceRedundancy capability: AvailableSpace utilization: 50%At least 4 pieces of diskIn addition to commonly used raid50,jbod two kinds of arrays, not commonly used RAID2, RAID3, RAID4 and so on."

' a.txt still think it is-n[Email protected] tmp]#[[email protected] tmp]# sed-nr ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt is not add-r?Sed:-E expression #1, char 32:unmatched) or \)[[email protected] tmp]# sed-n ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt haven't found the reason[[email protected] tmp]# sed-n ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' A.txt|xargs lsI haven't found a reason.A.txt P.txt Test.txt[[email protected] tmp]# sed-n ' 3s#^.*

the CMOS?CMOS (Complementary metel-oxide Semiconductor) is an abbreviation for complementary metal oxide semiconductors. It is meant to be a technology used in the manufacture of LSI chips or chips made from this technology. This usually refers to a read-write RAM chip on the computer's motherboard. It stores the real-time clock information and hardware configuration information of the computer system. When the system is booting the machine, it reads

:00.0[[email protected]:~] Ethtool-i VMNIC7DRIVER:BNX2XVERSION:1.78.80.V60.12FIRMWARE-VERSION:BC 7.8.55bus-info:0000:11:00.1Gets the type of driver currently used by the host bus adapter[Email protected]:~] esxcfg-scsidevs-avmhba0 lsi_mr3 link-n/a sas.500605b00cbce9e0 (0000: 07:00.0) LSI megaraid SAS Invader Controllervmhba32 iscsi_vmk online iqn.1998-01.com.vmware:594af84f-3e99-cb7d- F42F-E04F43072844-7704B070ISCSI Software Adapter-------------------

Recently tried Word2vec, GloVe and the corresponding Python version Gensim Word2vec and Python-glove, the intention is to test on a larger corpus, the natural Wikipedia corpus entered the line of sight. Wikipedia official provides a very good Wikipedia data source: https://dumps.wikimedia.org, you can easily download a variety of languages in various formats of Wikipedia data. Before using Gensim's English Wikipedia corpus and training the Lsi,lda mod

To STM32 any module before the use of its initialization, the first is to initialize the peripheral clock, you can simply look at the system clock chapter on peripheral clocks, look at the data manual is as follows: The watchdog is driven by an independent internal 40M clock, so it does not require us to configure the registers in the initialization clock. Read the data manual can know the watchdog module uses the system LSI clock, before i