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Ceph crush the question to read over and over again, the relevant chapters of the CEPH source analysis book are summarized as follows:4.2.1 Hierarchical Cluster MapExample 4-1 Cluster map definitionHierarchical cluster map defines the static

The CEpH experiment environment has been used within the company for a period of time. It is stable to use the Block devices provided by RBD to create virtual machines and allocate blocks to virtual machines. However, most of the current environment

Stability Problem of sorting algorithmBefore the written test, the interview, has been asked about the common ranking algorithm stability model problem, sometimes often is more choice, although have seen a lot of such problems, but each time is not

Large summary of sorting algorithmsSorting algorithm is the most basic and most commonly used algorithms, but also the major listed companies will often be asked to interview the knowledge Point, different sorting algorithms in different scenarios

Ceph environment setup (2)1. There are three layout hosts: node1, node2, and node3. Each host has three osdks, as shown in figure. osd1, and 8 are SSD disks, 4 is the SATA disk. Each of the three hosts has a Monitor and an MDS. We use osd1, 3, and 4

Sql> Select substr (' Liuyuehui ', 3) as first_name from dual;First_Name--------------UyuehuiSql> Select substr (' Liuyuehui ', 1) as first_name from dual;First_Name------------------LiuyuehuiSql> Select substr (' Liuyuehui ', 0) as first_name from

The use case is simple, I want to use both SSD disks and SATA disks within the same machine and ultimately create pools pointing to SSD or SATA disks. in order to achieve our goal, we need to modify the crush map. my example has 2 SATA disks and 2

Using system;Using system. Text. regularexpressions;Using system. collections; Namespace ccnuhome. toolsobject{/// /// Regular summary./// Public class regular{Public regular (){//// Todo: add the constructor logic here//} Public String

5Use other synchronization Technologies Another synchronization mechanism is the monitor, which Ruby implements in the monitor. RB library. This technology is more advanced than mutex. In particular, mutex locks cannot be nested, but listener

Version control tips for API developmentChszs, reprint need to indicate. Blog home:Http://blog.csdn.net/chszsWhen designing and building APIs, versioning of the APIs is very important.You must ensure that the new API does not cause damage to