synology nas raid

NVRAM is a card and has no physical connection with Ram, although they all look like memory. the first type is used in low-end netapp products, and the second type is used in high-end netapp products. Ram stores data caches, while NVRAM stores operation logs. Similar to the database's archive log. Think: NVRAM is protected by a battery, but what about Ram? Data cache is installed in Ram. If it loses power, it will lose data. I have consulted many people and cannot get a clear and detail reply..

will introduce raid Raid is short for "redundant arrayof independent disk", which means "independent redundant disk array" in Chinese ". A simple explanation is to combine n hard disks with RAID Controller (hardware, software) into a single virtual large-capacity hard disk. Disk Arrays use different technologies for different applications, called

When asked whether traditional raid can be built on SSD, the first response should be "yes, but trim command support is required ". On the Internet, we can also see that many people use SSD to create raid, but basically it is configured as RAID 0 or raid 1. Few people will build RAID5. Why? The answer is very simple. I

Recently, the server encountered a small problem. I had to redo raid. I found an article on the Internet. I felt very careful. I 'd like to share it with you. Record the record when the server is reinstalled and share it with you. Hardware RAID 5: Recently, I personally assembled a 1u rack-mounted storage server with an 8-hard drive using a dual-core P4 820d processor. During the assembly process, I create

We usually have a RAID array level choice when deploying servers, and RAID technology has grown to dozens of today, but we often use only a few of our production systems, such as 0,1,5,0+1. Reader friends may be familiar with the various levels of RAID theory and can even recite it, but there may not be much psychological when it comes to choosing the

Raid:Redundant Arrays of Inexpensive DisksIndependentBerkeley:a Case for redundent Arrays of inexpensive Disks RAIDImproved IO capability:Parallel disk read and write;Increased durability;Disk redundancy to achieveLevel: Multiple disk organizations work together in different ways;How the raid is implemented:External disk array: Adapter capability with expansion cardsOn-chip RAID: Motherboard integrated

Detailed explanation of Hard Disk RAID technologyI. Raid DefinitionRAID (Redundant Array ofindependent disk independent redundant disk array) technology was proposed by the University of California at Berkeley in 1987, initially to combine small cheap disks to replace large expensive disks, at the same time, it is hoped that the disk will not cause data access losses when it becomes invalid, and a certain l

RAID 0 RAID 0 is also called a zone set. It concatenates more than two disks to form a large-capacity disk. When data is stored, segments are distributed and stored in these disks. Because read/write operations can be performed concurrently, RAID 0 is the fastest speed at all levels. However, RAID 0 has neither redunda

Introduction One of the most common techniques to improve either DataReliabilityOr DataPerformance(Or both) isCalled RAID (Redundant Array of Inexpensive Disks). The concept was developed in1977 by DavidPatterson, Garth Gibson, and Randy KatzAs a way to use several inexpensiveDisks to create a single disk from the perspective of the OS while alsoAchieving enhanced reliability or performance or both. Before anyone erupts and says that raidDoes not St

RaidRedundant array of independent hard disks (RAID, redundant array of independent Disks), formerly redundant Array of inexpensive disks (redundant array of inexpensive Disks), referred to as disk arrays.Divided into raid-0,raid-1,raid-2,raid-3,

Tags: restart create hard disk tail SHA support No disk array UIDI. LVM vs. RAID features LVM RAID LVM for dynamic capacity expansion RAID supports dynamic capacity expansion LVM does not support disk acceleration RAID supports disk acceleration

Do you know the RAID initialization process? The RAID system is an effective means to protect the stored data. During RAID creation, a very long system initialization process often exists. Why is there such an operation during RAID initialization? What is the impact of this operation on SSD? From the perspective of tec

Data security is one of the most important problems people use in computers. Typically, a hard disk mirroring technique is used in a server environment to achieve a dual backup of the data. Also, we can use this technology in a Linux environment. In the Linux environment, the use of raidtools tools, not only can be two hard disk mirroring, but also can make soft RAID0, RAID1, RAID5. Said to be soft raid, because the

Raid,redundant Arrays of the abbreviation for independent disks, redundant array of independent disks, referred to as disk array. The disk array is actually divided into soft array (Software RAID) and hard array (hardware RAID). Soft array: That is, through software programs and the computer's CPU to provide operational capabilities. Because the software progra

What is RAID? RAID is an abbreviation for the English Redundant array of independent disks, which translates into Chinese as a redundant array of independent disks, or simply a disk array. Simply put, RAID is a technology that combines multiple separate hard disks (physical hard disks) into a single hard drive group (logical hard disk) in a different way, provi

1. What is raid0? Raid0, which divides data into several halves and writes data to multiple disks A: A1 A2 ...... Performance improvement. At least two disks are required. Merge multiple disks into a large disk with no redundancy and parallel I/O, with the fastest speed. RAID 0 is also called a zone set. It associates multiple disks to form a large disk. When storing data, the data is segmented by the number of disks and written into these disks at t

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

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

RAID (Redundant array of independent Disks): Redundant array of independent disks. The initial purpose of RAID was to address the need for small and medium-sized businesses to use SCSCI hard drives for financial reasons, and to combine multiple IDE disks with a mechanism that would allow IDE disks to improve read and write performance to some extent, using a disk that is cheaper than the IDE. Of course, it

Disk array (RAID) instances RAID Technology classification Soft RAID Technology Hard RAID Technology The difference between RAID and LVM Why choose to use raid