best raid for backup

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Recover lost raid devices in Linux

Recently, I encountered a headache. the Linux File Server I maintained suddenly collapsed for no reason. Many files in the root file system disappear. All data is stored on a raid device, but mdadm. conf in/etc/does not exist. UUID is lost. This raid has 1 TB of data on it, and the backup server has insufficient space and not all of the backups. It is strange

Can TRIM operations be performed in RAID?

Can TRIM operations be performed in RAID? I wonder if you have considered the following question: can TRIM operations be supported in RAID? Imagine how to unmap the data block in the SSD by using the TRIM command after the RAID is created on the SSD and the application software (File System) runs directly on the RAID s

On RAID write penalty (write penalty) and IOPS calculation (reprint)

IntroducedOften when discussing the performance of different RAID protection types, the conclusion will be that RAID-1 provides better read and write performance, RAID-5 read performance is good, but write performance is not as high as raid-1,raid-6 protection level, but wri

Implementation of soft RAID under Linux

Raid:Common RAID levels:RAID 0:Operating mode: The data is striped first, and then stored to the hard disk.Space utilization: 100%Whether redundancy is supported: noPerformance: Disk IO increased (depending on the number of disks)Requires at least 2 disksRAID 1:Operating mode: There is a disk for the mirror diskSpace utilization: 1/2Whether redundancy is supported: YesPerformance: Write performance degraded, read performance unchangedRequires at least

RAID Technology Introduction and summary

Brief introductionRAID is a noun that we can often see. But because rarely can experience in the actual environment, so it is difficult to have a very clear understanding and grasp of its principle. This article will introduce and summarize the raid technology in order to clarify its concept as much as possible.RAID is all called Redundant Array of independent disks (redundant array of independent Disks), the basic idea is to combine a number of relat

Megacli learning and r710 available RAID card categories)

-getbbustatus-aall | grep 'relative state of charge' [view charging progress percentage]The change in the tape status, from disk pulling to disk insertion.Device | normal | damage | rebuild | normalVirtual Drive | OPTIMAL | degraded | OPTIMALPhysical drive | online | failed-> unconfigured | rebuild | online R710 available RAID card category Internal:Perc h200 (6 GB/second)Perc h700 (6 GB/sec) with 512 MB battery b

LSI SAS1068 RAID Array card graphics and text configuration tutorial _ server Other

1. Install all SAS hard drive, boot up 2, the post process appears Ctrl + C prompts, press CTRL + C into LSI Logic Config Utility ... Start SAS configuration 3, select the "SAS 1068" channel, press. 4, RAID select "Raid Properties", press RAID Properties: Creating, managing arraysSAS topology: View Physical disk and

Linux Raid and LVM management

1. Disk Management#提示没有partprobeYum-y Install parted#新硬盘新建分区 and change the type to Linux Raid AutoDetect#非交互方式, note that there is a enter key between 1 and TFDISK/DEV/SDE Fdisk.txt:NP11TFdW#新建分区, note that there is a return enter between 1 and WFDISK/DEV/SDF Fdisk.txt:NP11WQ#将磁盘格式化为ext4文件系统Mkfs.ext4/dev/sde#2. Radi Management#以两块硬盘做raid0,-l0 says Raid0,-n2 says raid with 2 hard drives#-a answer all prompt

RAID and Mdadm command two

Hardware RAID: The motherboard contains a RAID card, to enable the raid must enter the BIOS boot RAID card function, and in the designated RAID level and the hard disk, when we enable hardware RAID, when we install the operating s

Disk Management-RAID 10

Disk Management mdash; RAID10 what is RAID10RAID10/01 is subdivided into RAID1 + 0 or RAID0 + 1. RAID1 + 0 is the first mirror and then split the data, and then all the hard disks are divided into two groups, which are regarded as the lowest combination of RAID0, and then the two groups are considered as the operation of raid1. RAID 0 + 1 is... Disk Management-RAID 10 What is

Do you know the Write Hole problem in RAID?

Do you know the Write Hole problem in RAID? In the RAID system, there will be a problem called Write Hole. What is the problem? What is the impact on users? How can we solve this problem in the open-source RAID system? How does one solve these problems? From the perspective of R D, storage Engineer Wu analyzed the problem and looked at its nature and solutions.

Implementation of blog 8:raid array

The composition principle of RAID arrays:1.raid:redundant Arrays of independent Disks independent redundant disk array1) Improved IO capability and increased durability2) Level: Multiple disk organizations work together in different ways3) How the raid is implemented:External disk array: Provides adaptive capability through an extended adapterInternal raid (soft

Install CentOS in Soft/hard RAID

Recently, we have a server that requires RAID. So today we will discuss how to install CentOS to RAID.There was a lot of nonsense in the front, mainly taking notes for yourself. laruence quickly clicked the upper right corner of the cross.First, because the motherboard chip is not supported, the cold blog did not successfully install hard RAID. For hard RAID, the

RHEL6.3x86 _ 64 soft RAID Experiment

Arrays are divided into soft RAID and hard RAID. Soft RAID is implemented by the system based on partitions. Hard RAID is a hard disk operation object, with RAID cards to implement the system environment: RHEL6.3x86 _ 64 This section describes the first step of Soft

RAID classification Description (from MongoDB authoritative guide)

RAID (Redundant array of independent disk, redundant array of independent disks, formerly known as Redundant Array of inexpensivedisk, redundant array of inexpensive disks) is a technique that allows us to use multiple disks as a single piece of disk. You can use it to raiseHigh-disk reliability or performance, or both. A set of disks that use RAID technology is called a

Several RAID Modes

Several RAID Modes 1. RAID0 That is, Data Stripping Data sharding technology. RAID 0 can connect multiple hard disks into a larger hard disk group to improve disk performance and throughput. RAID 0 has no redundancy or error repair capability. It is low in cost and requires at least two disks. Generally, RAID 0 is used

Q & A on raid and bbu

In the past few days, the write policy of the RAID card is switched back to WT from WB. If "Learn cycle" occurs during business peaks, it will seriously affect the performance of the database. After the problem is solved, sort out your understanding of these problems. I will not describe the megacli command set I have used. There are a lot of information about it on the Internet. We recommend related articles by Tan and ye from Chinese documents. I wi

Raid in glusterfs

I have never understood the concept of raid. I just read it over the past two days. Raid is short for "Redundant Array of Independent Disks". It means an independent redundant disk array, disk Arrays use different technologies for different applications, known as raid level, and each level represents different technologies. Currently, the industry-recognized stan

WINDOWS 2008r2 Domain Server password forgotten or modified by others, and the server does RAID 5 resolution

WINDOWS 2008R2 The domain server password is forgotten or modified by others, and the server does RAID 5 SolvePrepare in advance: A, download the server RAID card driver on the USB stick. B, find a copy of the same version of the operating disc1. Use the same version of the operating system installation CD as the local machine to boot from the CD. (Remember not to insert any USB stick device) If you insert

RAID Technology-research experience

Raid--redundant Array of Inexpensive DisksRedundant array of Inexpensive disksRedundancy is not superfluousRAID is the combination of multiple physical hard disks in different ways to form a hard disk group. Provides higher storage performance than a single hard drive and provides data backup technology.RAID resolution issues: storage performance and data security issues.RAID level:0,1,5,6,10,01Classificati

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