raid 10 array

, they are often written in Discrete mode. Ixdba. Net Community ForumNext, assume that we want to convert a number 2 to a number 4. For RAID5, there are actually four Io operations,Read 2 and check 6 first, and a read hit may occur.Then calculate the new verification in the cache.Write new number 4 and new verification 8For raid10, we can see that for a single operation, only two Io is required for raid10, and four Io is required for RAID5.However, here I ignore RAID5, when there are two read o

application of the disk array is mainly to consider the following points: Data security and reliability: Refers to the security of the network data, but when the disk is damaged, whether the data can be safe to rescue or use it; Capacity: Multiple disks can be combined, so a single file system can have considerable capacity. The key is to ensure that the reliability and security of the data (integrity) is the focus of

best to use the same capacity of the same speed of the hard disk, the effective capacity of the RAID 5 mode is the smallest capacity in the array of hard disk capacity in the number of hard drives minus one, the number of hard drives here to subtract one because one of the hard disk to hold the verification information. RAID 5 Doubles the speed and ensures the s

Raid 10: Make at least four hard disks into RAID 1. If there are four hard disks, there will be two to rand1 disks. If there are eight hard disks, there will be four to raid 1 disks, the biggest purpose of raid1 is to ensure high data security and high read/write speed, but to sacrifice half of the disk space. If the n

, and starts synchronizing the disk. Old version 1 Restart the host press ctrl-c into the configuration menu, the cursor on the 2 Select DEVICE PROPERTIES to find hard drive, press 3) Select Mirroring PROPERTIES Press 4 Select the first hard drive, the third column mirror pair item, and set it to primary by the-/+ number. 5 Select the second hard drive, the third column Mirror pair, and press the-/+ number to set it to seconde 6 Press ESC, select "SAVE change THEN EXIT This menu", press 7 Press

is similar to raid-0. 5. At least 3 disks, disk utilization N-1 Blocks Insufficient: The data write efficiency does not necessarily increase, because the data to be written to RAID 5 must pass the calculated check code (parity ). Therefore, the write performance is significantly related to the system hardware. Especially when a software disk array is used, the c

generates mutually backed up data on paired Independent Disks. When raw data is busy, data can be directly copied from the image, so RAID 1 can improve read performance. Raid 1 is the most costly disk array, but provides high data security and availability. When a disk fails, the system can automatically switch to the image disk to read and write data without re

RAID 10 (also called a raid 1+0 or mirrored stripe) array combines the functionality features of RAID 0 and RAID 12 to provide high-performance, fault-tolerant disk input/output operations. In

backed up on a pair of independent disks. When raw data is busy, the data can be read directly from the mirrored copy, so RAID 1 can improve read performance. RAID 1 is the highest unit cost in a disk array, but provides a high level of data security and availability. When a disk fails, the system can automatically switch to read and write on the mirrored disk w

RAID technology mainly includes RAID 0 ~ Raid 50 and other specifications have different focuses. common specifications include: 　　RAID 0: RAID 0 continuously splits data by bit or byte and reads/writes data on multiple disks in parallel. Therefore,

RaidDevice State0 8 21 0 active sync/dev/sdb51 8 22 1 active sync/dev/sdb6Simulate disk damage (Management Mode)[Root @ local ~] # Mdadm/dev/md1 -- fail/dev/sdb5Mdadm: set/dev/sdb5 faulty in/dev/md1Remove the damaged hard disk: (-r = -- remove)[Root @ local ~] # Mdadm/dev/md1-r/dev/sdb5Mdadm: hot removed/dev/sdb5Replace the new disk (consistent with the partition of the broken disk)[Root @ local ~] # Mdadm/dev/md1-a/dev/sdb7Mdadm: added/dev/sdb7Stop a disk