best raid for backup

times, dozens of times times even up to a hundredfold rate.• Provides fault-tolerant functionalityOrdinary disk drives fail to provide fault tolerance, RAID provides fault tolerance, and raid fault tolerance is built on the hardware fault tolerance of each disk drive, so it provides greater security. In many raid modes, there areMore complete mutual verification

the checksum dataNote: A minimum of three disks is required, at least one of which is used to store the checksum data, which can be repaired by part of the data and checksum data when one of the pieces is damaged. There are many applications in the enterprise, and hot backups of the disks are made in the enterprise, and when one of the disks is about to be damaged, the backup disk works to write the disk data that is about to be damaged.? RAID6, cost

Article Title: General thread-software RAID in the new Linux2.4 kernel, Part 1. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. By Daniel Robbins 　　 Installation and introduction 　　 The new Linux 2.4 kernel is available! You should immediately find an idle PC and install Linux to see what it can do! In two articles

1. Server and Storage System Server: provides compute power and service for network requests. Storage System: storage device + Storage Management System +raid Disk system, accept I/O requests. Storage Architecture: The DAS (direct Attach STorage) storage device is connected directly to the server with an interface of IDE or SCSI. NAS (Network attached Storage) network-attached storage, which uses networking technology to conn

hard disk in the disk array is damaged, use this backup hard disk as a replacement. In this case, even if the Administrator does not find any damaged hard disk, the impact on the Enterprise will not be great. Most disk array technologies support backup hard disks. When a hard disk is not working properly, the disk array immediately starts the backup hard disk. S

ways to form aHard disk group (logical hard disk) to provide data backup with higher storage performance and storage capacity than a single hard driveTechnology.In the user's opinion, the group of disks is like a hard disk, which the user can partition, formatThe different ways that make up the disk array become RAID levels (RAID levels). The

There are two ways that a disk array can be implemented, that is, "software arrays" and "hardware arrays."A software array is the Disk management function provided by the network operating system itself to configure multiple hard disks on a connected common SCSI card into a logical disk to form an array. The software array can provide data redundancy, but the performance of the disk subsystem will be reduced, some of the reduction is still relatively large, up to 30%.The hardware array is implem

, primary Partition 231.5g game Installation Download files GB G download game GB Software Installation 150G Tool Shared Hard Disk: GB documentation 331.5g various music, movies, pictures Linux: use the latest fedora20 300 M boot partition, primary partition, no raid, because grub2 does not support raid, so boot is separately divided 300 M boot backup partition,

Nbsp; 1. Environment 1. the operating system is CentOS4.4, and the mdadm software is provided by the system. the version is 1.6.0-32. hda is installed with four hard disks, sda, sdb, sdc, and sdd, which are raid 5. sdd is hot backup. II. Preparation 1. first, format the four SCSI hard disks. Input the command fdisk? I. environment1. the operating system is CentOS4.4, and the mdadm software is provided by th

partition, primary partition 231.5G Game Installation 200G Download File 200G Download Game 150G installation Software 150G Tools Shared hard disk: 100G Document 331.5G all kinds of music, movies, pictures Linux: Using the latest FEDORA20 300M boot partition, primary partition, do not use RAID, because GRUB2 visual does not support raid, so separate the boot out 300M boot

/Output Operation Per Second, that is, read/write Per Second (IO) the number of operations is mostly used in databases. It is an important parameter to measure the performance of random access. In addition, we found that the defects of modern disks: weak IO performance and poor stability. RAID, also known as Redundant Array of Independent Disks, is a Redundant Array of cheap Disks. It runs on multiple Disks in parallel to provide computer storage I/O

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

Detailed steps for quick installation of Soft RAID on Linux Physical Environment: Virtual Machine CentOS6.4Configuration: 8 GB memory, 2x2 core cpu, 3 virtual hard disks (sda, sdb, sdc, sdb, and sdc are identical) in the actual production environment, system hard disks are separated from databases and applications, which is conducive to system maintenance and data application usage. In this environment, sda is used as the system disk, and sdb + sdc is

Common hard drives: SATA General pc mainstream HDD. SCSI general servers are widely used. The IDE is older and both are available. RAID it means redundant array of inexpensive disks. is a collection of disks that are placed together to become a logical volume. Software RAID and hardware RAIDSoftware RAID performance is low, use host resources, load

Tags: data recovery RAID disk array database recoveryA customer's DS5020 fiber storage failure results in data loss, which uses 16 hard disks to form a RAID disk array. The 10th and 13th dials are dropped, and the number 6th warns that data recovery is required.RAID disk array failure conditions:The full log state of the current store is backed up by IBM Storage Manager, and the stored logs that are backed

Mount profile to mount it with the system boot[Email protected] ~]# Vi/etc/fstab/DEV/MD0/VAR/RAID5 EXT4 Defaults 0 010. What happens if one of the hard drives is broken? The system will automatically stop the hard drive, and then let the backup drive on top of the work. Under test:[Email protected] ~]# cp-r/data/package//bakcup/Let a piece of disk stop working first[Email protected] ~]# mdadm/dev/md0--FAIL/DEV/SDC1[Email protected] ~]# Cat/proc/mdsta

Application of RAID disk array RAID, which is generally translated as a Disk array and its full name is Redundant Arrays of Inexpensive Disk. It was initially conceived as a project by a research team at the University of California, Berkeley, they hope to build a cheap and highly available disk array through a large number of cheap hard disks. However, the development of

1. Server and Storage System Server: provides compute power and service for network requests. Storage System: storage device + Storage Management System +raid Disk system, accept I/O requests. Storage Architecture: DAS (direct Attach STorage) storage device connects directly to the server NAS (Network attached Storage) network-attached storage that uses networking technology to connect storage systems via a switch. SAN (S

to continue? [Y/n]: y ERROR: Raid set deletion is notsupported in "ddf1" format [Root @ web1 ~] # -- Use: dmraid-rE [Root @ web1 mapper] # dmraid-rE Do you really want to erase "ddf1" ondisk metadata on/dev/sda? [Y/n]: y ERROR: ddf1. seeking device "/dev/sda" to 38070153641984 ERROR: writing metadata to/dev/sda, offset74355768832 sectors, size 0 bytes returned 0 ERROR: erasing ondisk metadata on/dev/sda [Root @ web1 mapper] # Cannot be cleared succ

1. Create the corresponding Partition 1 [[email protected] ~] # Fdisk/dev/SDB 2 finally creates multiple partitions for raid as follows: 3 device boot start end blocks ID system 4/dev/sdb1 2048 10485759 5241856 5 Extended 5/dev/sdb5 4096 2101247 1048576 83 Linux 6/dev/sdb6 2103296 4200447 83 Linux 7/ dev/sdb7 4202496 6299647 1048576 83 Linux 8/dev/sdb8 6301696 8398847 1048576 83 Linux 2. Create a raid 1. If