best raid for backup

RAID overview RAID is short for RedundantArrayofInexpensiveDisk. with this technology, multiple disks can be integrated into one array and can be used as a single disk. The RAID disk array can be used to improve data read/write efficiency and data redundancy (backup) based on different technologies. when a disk in the

/mdadm.confDevice/dev/sdd5/dev/sdd6/dev/sdd7/dev/sdd8ARRAY/DEV/MD1 DEVICES=/DEV/SDD5,/DEV/SDD6,/DEV/SDD7,/DEV/SDD8(5) Creating a file systemMkfs.ext3/dev/md1(6) Mounting a RAID 5 deviceMkdir/mnt/raid5Mount/dev/md1/mnt/raid5(7) Managing RAID 5 arrays # Rebuild RAID 5 with backup diskMDADM/DEV/MD1--fail/dev/sdd6Mdadm--DE

2.The/dev/sdb {1, 2} device is/dev/sdb1 and/dev/sdb2.In this case, the system sometimes prompts that the partition is in use, but the partition can still be created successfully. You can view the raid status continuously during operations. 4. View Raid status Cat/proc/mdstat View Raid details Mdadm-D/dev/md0 5. Now that the

For a long time, we have seen a lot of competition over the performance of RAID 5 and raid 10. Even many people have come up with test data, but who is the right. Here, I will analyze the internal operating principles of these two raid types. Under what circumstances should we choose which raid mode. In order to facili

When it comes to disk arrays (raid,redundant array of independent disks), it is now almost one of the technologies that network administrators must master, especially small and medium-sized enterprises, because disk arrays are widely used and are one of the main scenarios for current data backup. However, many network administrators only in various media to see the relevant theoretical knowledge, but did no

Linux RAID card optimization and Linux raid OptimizationIntroduction Our production servers often use raid storage. But can raid alone ensure high performance and data security? The answer is no. We generally recommend using raid cards with battery protection. This ensures p

Raid, short for Redundant Arrays of Independent Disks, is cheap in Chinese ※redundant disk array. Disk arrays are also divided into software raid and hardware raid. the soft array is achieved by the software program and the CPU of the computer. because the software program is not a complete system, it can only provide the most basic

as an errorCheck out the disk information: mdadm–-detail/dev/md0Simply look at the raid scenario:The completion of the creation means that RAID5 has been automatically restored.Check to see if RAID5 is working properly!Write the data inside.Remove the faulted disk and add a new disk to the backup spare diskFirst delete the damaged disk SDDMDADM–MANAGE/DEV/MD0--REMOVE/DEV/SDD//will be broken disk SDD from

Brief Introduction to RAID Disk Arrays RAID is the abbreviation of "Redundant Array of Independent Disk". It is translated as a Redundant Array of Independent Disks, which is actually the storage, access, and backup technology of disks. Before talking about RAID, let's take a look at some basic knowledge about memory.

: Make any block device raidModal Commands:To create a pattern:-CDedicated options:-L: Level-N: Number of devices-a -c:chunk size, data shard size, default 64KB-X: Specify the number of free disks# mdadm-c/dev/md0-a yes-l 0-n 3/dev/sd{b,c,d}-Create raid0/dev/md0 three-block disk# mdadm-c/dev/md0-a yes-l 1-n 2-x 1/dev/sd{b,c,d}-Create RAID1 with free disk# Cat/proc/mdstat-View array statusManagement mode:--add,--Remove,--fail# mdadm/dev/md0--fail/dev/sdb---/dev/sdb to unavailable stateMonitor mod

Software RAID 0, software RAID Implementation of Software RAID 0 RAID 0, also known as Stripe or Striping, represents the highest storage performance in all RAID levels. RAID 0 improves storage performance by distributing continuo

For special applications such as databases, iops often becomes a bottleneck. There are not many effective methods to break through this bottleneck. The main software aspects are read/write splitting, vertical splitting, partition table technology, and cluster. The hardware is mainly raid and SSD. Usually software and hardware are optimized at the same time. Compared with the test, the hardware uses raid mor

, the initial data is interleaved in each disk chunk, and when the minimum disk space is exhausted, the remaining data is placed on the largest disk.The performance will become worse.However, the damage to RAID 0 is still very large, if a disk is broken, then the entire RAID 0 will not be used.=============================================================================================================== ===

two Arrays:/dev/md0 and/dev/md1. At the time of creation,/dev/md0 contains a hot backup disk, while/dev/md1 does not have a hot backup disk. We only need to configure two arrays in/etc/mdadm. conf to use the same spare-group. [Root @ fc5 mdadm-2.6.3] # cat/etc/mdadm. confDEVICE/dev/sdb/dev/sdc/dev/sdd/dev/sde/dev/sdf/dev/sdg/dev/sdh/dev/sdi1/dev/sdj1/dev/ sdk1 ARRAY/dev/md1 level = raid0 num-devices = 3 sp

, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectorsUnits = sectors of 1*512 = 512 bytesSector size (logical/physical): 512 bytes/512 bytesI/O size (minimum/optimal): 512 bytes/512 bytesDisk identifier: 0x466fc1b6Device Boot Start End Blocks Id System/dev/sdb1 2048 10487807 5242880 83 Linux/dev/sdb2 10487808 41943039 15727616 5 Extended/dev/sdb5 10489856 16781311 3145728 83 Linux/dev/sdb6 16783360 23074815 3145728 83 Linux/dev/sdb7 23076864 29368319 3145728 83 L