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Article Title: how to restore Raid hard disks damaged by Raid tools. 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. Test environment: VMware 1, 6.0 Rad Hat Linux 9.0 Raidtools 1.00.3 Raid1 has been implemented Configuration file/etc/raidtab
, 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
Array of Independent Disks ).To put it simply, RAID is an independent hard disk (physical hard disk: After observation, the blade server provided by the customer has four hot-swappable hard disks, each of which is 500 GB) A hard disk group (logical hard disk) is formed in different ways to provide higher storage performance than a single hard disk and Data Backup technology.
redundancy capabilityFree space: 1*min (S1,s2 ... Determined by the minimum hard disk space)Applicable field: Finance, finance and other high-availability, high-security data storage environment; RAID-4 Data are stored in sequence on multiple hard disks, a separate hard disk to do redundant backup, fault tolerance has been raised. However, independent hard disk access pressure is large, there
Tags: Impact of capability computing book security Raid 4: At least three hard disks are required and a disk is designed to store verification codes. However, when data is requested to be written, data is first written to other disks, when the disk is verified, the verification code is calculated and then written to the disk. Then, the verification code is repeatedly written to other disks, and the verification code is repeatedly written to the di
Data security is one of the most important issues in the use of computers. Generally, Hard Disk Mirroring technology is used in the server environment to achieve dual data backup. We can also use this technology in Linux. In Linux, Raidtools can be used to mirror not only two hard disks, but also soft RAID 0, RAID 1, and RAI
may cause raid failure, unable to recover the data itself. 7, human error operation: Data recovery is a significant part of the disaster can be avoided, but there will always be a situation: unrelated people mistakenly pull the raid in the hard drive, did not prepare spare parts disk, not in time to change the disk, to raid dust to forget the original order, ac
RAID is an abbreviation for "Redundant array of independent disk", which translates to redundant arrays called stand-alone disks, which is actually the storage, access, and backup technology of the disk. Before you talk about RAID, learn the basics of memory in a nutshell.1. Memory baseWhen it comes to memory, as the name implies, is used to store data, there are
knowledge. I am afraid of knowing the problem when I start to learn materials and solve it. what impressed me most is: when the customer came to me, he told me that the server had already been RAID, but I was a bit blind. If I didn't know what this was, I simply understood it as READ, only by looking for such information can we know that RAID is the real thing. RAID
First, RAID: Independent redundant disk array ;Also known as a redundant array of inexpensive disks (redundant array of inexpensive disk), multiple independent physical disks are combined in different ways to form a virtual disk.Ii. Why RAID is used in the production environment? What are the advantages of RAID? 1. The advantages of
= 16/dev/md0 notice: -- chunk is specified at creation and stribe is specified in format, stribe = chunk/stribe RAID 1: Image, fault tolerance, read performance, at least 2, multiples of 2, utilization (100/n) % test: mdadm -- create/dev/md0 -- level = 1 -- raid-devices = 2/dev/sda4, 5 RAID 5: distributed parity strip, fault tolerance, performance, if a disk is
In Linux, how does one set RAID 10 to ensure high-performance and fault-tolerant disk input/output? (1) RAID 10, also known as RAID 1 + 0 or image strip) array combines the features of RAID 0 and RAID 1 to provide high-performance, fault-tolerant disk input/output operation
I. fault description of RAID data recovery Fault descriptionThe total storage space of hp fc msa2000 is composed of eight 450 gb sas hard disks, of which seven are a RAID 5 array, and the remaining one is used as a hot backup disk. Two hard disks are damaged in the RAID 5 array, and only one hot spare disk is activated
Disk Synchronization. Old Version1) restart the host press the CTRL-C to ENTER the configuration menu, place the cursor on the first channel, and press 2) Select device properties to find the hard disk and press 3) select processing PROPERTIES and press 4) Select the first hard disk, the third column of the mirror pair item, and press-/+ to set it to PRIMARY.5) Select the second hard disk, and set the mirror pair item in the third column to SECONDE by-/+.6) Press ESC, select save change then ex
Principle of RAID5 Data recovery algorithmTo understand the principle of RAID5 data recovery first to know RAID5, "distributed parity of the independent disk structure" is what we call the RAID5 data recovery has a concept to understand, that is, "parity check." We can simply understand it as an "XOR operation" in binary operations, usually using an XOR identity. The rule for this operation is that if the values are the same, the result is 0, and if the results are different, the result is 1.For
disk faults. We recommend that you run all the databases in ARCHIVELOG mode without considering the RAID architecture. Oracle also recommends regular Oracle backup. Remember, the I/O subsystem consists of many components, including controllers, channels, and disk adapters, and the SCSI adapter-any crash of these components will cause irreparable disk errors to your database. Now let's take a look at the mo
difference between it and RAID 3 is that it verifies whether data is evenly distributed to each hard disk. RAID 5 has the advantages of data security, fast read/write speed, and high space utilization. It is widely used, but the disadvantage is that if one hard disk fails, the performance of the entire system will be greatly reduced. Raid 1,
sequentially, so the amount of data per disk is reduced! According to this situation, the more the RAID-0 the better , because each disk is responsible for a lower amount of data, which means that the data can be dispersed so that more than one disk to store, of course, it will become better ! apparently the whole the capacity of the RAID is also getting larger. However, if there is a serious risk in this
Disk/dev/sde: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065*512 = 8225280 bytes Device Boot Start End Blocks Id System 1. create Soft RAID 1. create a raid partition [root@www.linuxidc.com ~] # Fdisk/dev/sdb The number of cylinders for this disk is set to 1044. there is nothing wrong with that, but this is larger than 1024, and cocould in certain setups ca
*512 = 8225280 bytes Device Boot Start End Blocks Id System Disk/dev/sdd: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065*512 = 8225280 bytes Device Boot Start End Blocks Id System Disk/dev/sde: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065*512 = 8225280 bytes Device Boot Start End Blocks Id System 1. create Soft RAID 1. create a
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