nas raid5

, 1011RAID-5:Improved read and write performanceFree space: (N-1) *min (s1,s2,...)Fault tolerance: 1 disksMinimum number of disks: 3,RAID-6:Improved read and write performanceFree space: (N-2) *min (s1,s2,...)Fault Tolerance: 2 disksMinimum number of disks: 4, 4+Mixed typeRAID-10:Improved read and write performanceFree space: n*min (S1,s2,...) /2Fault tolerance: Each group of images can only be broken one piece;Minimum number of disks: 4, 4+Jbod:just a Bunch of DisksFunction: The space of multip

suitable for applications where there are fewer write operations and more read operations, such as databases and Web servers.RAID 4Similar to RAID3, but RAID4 is accessed by block (sector). There is no need for a small I/O operation, like RAID3, to involve a whole group of two hard drives (one data disk, one check disk) in the group, thus increasing the small data I/O speed.RAID 5Parity (XOR), data is stored in block-segmented striping. The checksum information is stored on all data disks.RAID5

[plain] # Copy files to the web Directory [root @ serv01 ~] # Cp/boot/*/web/# View RAID5 details [root @ serv01 ~] # Mdadm-D/dev/md5/dev/md5: Version: 1.2 Creation Time: Fri Aug 200:35:07 2013 Raid Level: raid5 Array Size: 4190208 (4.00 GiB 4.29 GB) used Dev Size: 2095104 (2046.34 MiB 2145.39 MB) Raid Devices: 3 Total Devices: 3 Persistence: Superblock is persistent Update Time: Fri Aug 2 00: 46: 462013 St

This section describes the read/write process in the raid5 module. This process is complex. The most critical function is handle_stripe. This function can be called multiple times to process one read or write operation. Of course, this function is also a core function of the raid5 module. It is also responsible for synchronization, reconstruction, and extension implementation. Before analysis, we need to pr

Use Bonnie to Test system IO speed Friday, 2004-09-17 11:33 eygle Original link: Http://www.eygle.com/unix/Use.Bonnie.To.Test.IO.speed.htm Bonnie is a minimal test system IO Performance tool, the source code is open. Author Homepage: http://www.textuality.com/bonnie/ You can also click here to download Compiling Bonnie is extremely simple, but requires you to install make and GCC (or cc) # makeoptions are ' make BSD ' and ' make SysV '-The default is ' BSD '. If you are messages about m

In data recovery, we often encounter array data recovery, some array data recovery is relatively simple, such as RAID1, RAID0, RAID5 and other simple structure of the array data recovery, this array of data recovery in the Shanghai Day Shield Data Recovery Center is extremely simple data recovery, recovery rate can reach almost 99%, But sometimes, we will meet more complex array data recovery problem, Shanghai Day Shield Data Recovery Center and every

1 Enter BIOS, click the System setting option;2 after entering, click the storage option;3 go in, there is only one option, is Avago megaraid4 after entering, click the Configure option;5 after entering, click on the clear configuration, that is, to clear the previous configurations;6 Clear Confirmation dialog box, select Yes;7 after clearing, the dialog box appears, select OK;8 after confirming, return to the following interface, choose Create Virtual Drive;9 Go in, choose Select RAID level, th

RAID5 systems are typically used for data protection in many large business situations. It must be admitted, however, that the RAID5 disk array system only allows a single hard drive to fail, and as the number of disk capacity and array width increases, the likelihood of a drive potential flaw is close to 100%. Naruto Data recovery in order to solve this problem, the RAID6 disk array system will soon be wid

safety, the capacity is halved, the speed is invariable.Q: RAID1 at least a few plates?A: RAID1 requires a minimum of two hard drives to achieve.RAID 0+1In order to achieve both high speed and security, RAID10 (or raid0+1) can be seen, the RAID10 is simply understood as a RAID0 array composed of multiple disks to mirror.Q: raid0+1 at least a few hard drives can be implemented.A: raid0+1 requires at least 4 disks.RAID 3 and RAID5Both RAID 3 and RAID5

physical hard disk can handle the IOPS is limited, such asTen k rpm-K rpm ATA——— ——— ——— theSimilarly, if an array has 120 15K rpm optical drive, then it can support the maximum iops of 120*150=18000, this is the theoretical value of the hardware limit, if the value is exceeded, the response of the hard disk may become very slow and not provide normal business. On RAID5 and RAID10, there is no difference in read ioPS, but the same business write ioPS

Detailed RAID Disk utilization one. RAID definitionRAID (Redundant array of independent disks independent redundant disk array) technology is the University of California, Berkeley, 1987, originally to combine small low-cost disk to replace large expensive disk, At the same time you want to disable the disk will not make access to data loss and develop a level of data protection technology. RAID is a redundant array of inexpensive disks that appear as a stand-alone, large storage device under t

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 prompts for YesMdadm-c/dev/md0-a YES-L0-N2/DEV/SDB/DEV/SDCmdadm-a Yes--create/dev/md0-v--raid-de

some unimportant data2>. RAID1:How you work: Store your source data on disk in a mirrored way. The same data is available on multiple disks. Implement fault tolerance.Features: 1> Read and write performance improvement, write performance slightly decreased 2> free space: 1*min (s1,s1,..) 3> have redundancy ability 4> minimum number of disks 2Application Scenario: Store data that is important and speed requirements for data read and write3>. RAID4:Working mode: at least three Disk , which has a

down Yes 1*disk 2 bucks. Raid4 Improve Improve Available (fixed plate) (n-1) disk 3 bucks. XOR or operation Raid5 Improve Improve Have (take turns) (n-1) disk 3 bucks. Raid5+0 Raid10 Improve Improve Yes N/2disk 4 bucks. With a lot of Raid0+1

Disk Management is important for an OPS engineer. How to manage the data, you can not do without raid.Content:1. Common Types of RAID: RAID0 (Strip)650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/4C/2D/wKioL1Q3uY-j5MMgAACbfrJJtok640.jpg "title=" 1.PNG " alt= "Wkiol1q3uy-j5mmgaacbfrjjtok640.jpg"/> RAID1 (Mirror)650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/4C/2D/wKioL1Q3ufyiOkzaAACQkt6mi1k438.jpg "title=" 2.PNG " alt= "Wkiol1q3ufyiokzaaacqkt6mi1k438.jpg"/>

[Data Recovery issues] RAID has different organizational scenarios, there are JBOD,RAID0,RAID1,RAID5,RAID6,RAID10,RAID01,ADG, and so on, what are the scenarios that apply to the environment? Answer There are 3 major problems with raid to solve: capacity consolidation, IO performance, storage security The JBOD is a low-end raid structure, sometimes the same as Windows spanned volume, is 1 or several hard drives connected to the end of the structure

system is relatively idleNologging option (nologging is not available if Dataguard is available)Large sort_ared_size or Pga_aggregate_target larger 5: What do you know about raid1+0 and RAID5?Unlike raid 0+1, RAID 10 (or RAID 1+0) is a RAID 1 array that consists of a hard disk drive and then a RAID 0 array between RAID 1 arrays.The RAID 10 mode has the same good data transfer performance as the raid 0+1 mode, but is more reliable than the raid 0+1. T

automatically removes the spare disk from the/dev/md0 group and adds it to/dev/md1. [Root @ fc5 mdadm-2.6.3] #. /mdadm -- monitor -- mail = root @ localhost -- syslog -- program =/root/md. sh -- delay = 300/dev/md * -- daemonise 8105 [root @ fc5 mdadm-2.6.3] #. /mdadm/dev/md1-f/dev/sdi1mdadm: set/dev/sdi1 faulty in/dev/md1 [root @ fc5 mdadm-2.6.3] #. /mdadm-D/dev/md1/dev/md1: Version: 00.90.03 Creation Time: Mon Aug 23 00:10:00 1999 Raid Level: raid5

greatly improves data reading. RAID-5 has a Data Reading Speed similar to RAID-0, and the disk space utilization is also higher than RAID 1. It is a compromise between RAID-0 and RAID-1. It is a storage solution that combines storage performance, data security, and storage costs. Because the storage cost is relatively low, it is a widely used solution.The data distribution in the RAID-5 array is similar to that in RAID-0. The data is also distributed to each hard disk, but Raid-5 does not have

filesystem will be automaticallychecked every 24 mounts or 180 days, whichever comes first. use tune2fs-c or-I to override. step 8 Mount [plain] # Mount web [root @ serv01 ~] # Mount/dev/myvg/mylv01/web # mount data [root @ serv01 ~] # Mount/dev/myvg/mylv02/data # view disk information [root @ serv01 ~] # Df-h Filesystem Size Used Avail Use % Mounted on/dev/sda2 9.7G 1.1G 8.1G 12%/tmpfs 188 M 0 188 M 0%/dev/shm/dev/sda1 194 M 25 M 160 M 14%/boot/dev/sda5 4.0G 137 M 3.7G 4%/opt/dev/sr0 3.4G 3.4G