failover scenarios

equivalent to var other = {name: "Tom", showName: function () {alert (this. name) ;}} other. showName (); // Tom [Compound scenario 2] Var name = 2; var a = {name: 3, fn: (function () {alert (this. name) ;}) (), fn1: function () {alert (this. name) ;}}. fn; // 2 [this in the anonymous function points to the Global Object]. fn1 (); // 3 [this of the internal function of the object points to the current object that calls the function] [Compound scenario 3] Var name = "Bob"; var nameObj = {na

After Node 1 is reboot, why is the resource of Node 1 not failover to node 2? Symptom: the customer asked a question, that is, during the reboot process of Node 1, through monitoring, there was no After Node 1 is reboot, why is the resource of Node 1 not failover to node 2? Symptom: the customer asked a question, that is, during the reboot process of Node 1, through monitoring, there was no After Node

The failover processing process bitsCN.com after the master database of db0101 is down in 48 nodes groups online Failover processing after 48 nodes in the online group and db0101 master database are down When a call is received, db0101 is Down and an error is reported: (1) Error 500,503,504 Error on the application page (2) email alert db0201 is down now! 1. Initial Determination of symptoms Ping ipv222

11g Dataguard standby cut into the main library and restored to the original standby environment after the test is completed#######################Overview:11204 single machine to implement DG, because the local requirements (read-write mode) to open standby, and then the original production environment can not have any impact, still external services;The idea is that: Standby direct failover to primary db, then the original DG relationship is destroy

1. Switch: User actively switch;2. Failover: Main Library failure, forced to switch; Switchover: General switchover switch are planned to switch, characterized by switching, will not lose any data, and this process is reversible, the entire dataguard environment will not be destroyed, All physical and logical standby in the original Dataguard environment can continue to work.Before you make a physical standby switch for Dataguard, you need to be awar

Before you create a SQL Server 2000 failover cluster, you must configure Microsoft Cluster Service (MSCS) and use the Cluster Administrator in Microsoft Windows NT4.0 or Windows 2000 to create at least one cluster disk resource. Before running SQL Server Setup, note the location of the cluster drive in the Cluster Administrator because this information is required to create a new failover cluster. Only SQL

A failover cluster must meet certain requirements of the hardware, software, and network infrastructure, and it requires an administrative account with the appropriate domain permissions. Specifically as follows: (i) Hardware requirements for failover clusters In a failover cluster, the following hardware is required: (1) Server: It is recommended that you use

This topic explains how to use the Failover Cluster Management tool or Cluster.exe to evict a node from a Windows Server 2008 failover cluster. After a node is exited from the cluster, the node cannot host the clustered mailbox server. If, for any reason, you attempt to evict a node from a failover cluster, you can use the last procedure in this topic to force t

Problem Database mirroring has become a popular feature in SQL Server 2005. With the following simple steps, using the SQL Server Management suite or running some T-SQL commands, you can easily create database mirroring in one or more of your databases. One of the configuration options for database mirroring is high availability mode. With this option, the principal, mirror, and witness three servers are placed in the appropriate location. This is the only option that allows automatic troublesh

We've written a lot of SQL Server-related articles in the near future, in order to improve the usability of the service, we think of the deployment AlwaysOn, the previous environment just deployed SQL Server Failover Cluster, so decided to put the cloud in a SQL Server to configure AlwaysOn, the idea is to add a node to the local SQL Server Failover cluster, then place the new home node in the Azure cloud a

#关闭保护模式, disable remote direct access to requirepass 654321 #本地访问需要密码 masterauth 654321 # Backup sync access requires password slave-read-only Yes #备端只读 # Configure Redis Sentinel to configure monitoring for the primary instance only. Sentinel can obtain information from the instance through the master instance. # Basic parameter description: Port 26379 #Sentinel Service port Sentinel monitor Myredis 192.168.1.xxx 6379 1 #监控 People group name/ip/Port/ The number of failure judgements (wh

= "Wkiol1tdjkisrhltaahrywrz6cy384.jpg"/>go to one of the file servers and link the shared disk. Configure the iSCSI initiator on the server , link the shared disk, enter the host name of the emulated virtual disk in the target, two file servers to link the shared disk, and then enter two servers respectively, install the required roles such as file services; After the role is added, The failover cluster feature is then added for two servers respective

How can I use the flashback database feature to restore the replicasuard environment after a failover ?, FailoverdataguardThe 11g slave uard standby is cut into the master database. After the test is completed, it is restored to the original standby environment.#######################Overview:11204 if a single machine implements dg on a single machine, standby needs to be enabled because of the local requirement (read/write mode). In this case, the or

Role Switching between Data Guard master and slave databases is divided into the following two types:1) SwitchoverSwithchover is generally designed to switch roles, such as upgrading. It is usually lossless, that is, there will be no data loss.Its execution is divided into two phases:1. convert Primary to Standby2. Convert Standby (one) to Primary2) FailoverFailover means that because a Primary fault cannot be recovered in a short time, Standby has to act as a Primay. If it is in the highest-per

[Oracle] role switching between Data Guard-Switchover and Failover Data Guard master/Slave databases can be divided into the following two types: 1) SwitchoverSwithchover is generally artificially scheduled for role switching, such as upgrading. It is usually lossless, that is, there will be no data loss. The execution of StandbyStandby is divided into two phases: converting Primary to StandbyStandby (one) to Primary2) FailoverFailover means that beca

Simulate a failover 1. Stop the listener of the standby database [oracle @ rhel132 ~] $ Lsnrctl stop2. the master database needs to be restarted. (If the listener is disabled in the slave database, the communication between the master database and the slave database is still not broken. It is a persistent connection ), after that, perform the switch logfile several times: SQL> shutdown immediate; Database closed. databasedismounted. ORACLE instanceshu

with 4 extra bytes in the G)] ARP message and removes an extra unicast GARP packet to the router. rediscovery Notes: After upgrading to 11.2.0.3, after vip failover, the ip address is not pingable from a different subnet on Linux. (This problem is seen only on Linux) Workaround After vip failover, run command/sbin/arping-U-c 3-I To update the ARP table of router. Please note: The ab

2 svr1 192.168.2.100 heartbeat 3 192.168.1.100 host node IP address 4 svr2 192.168.2.101 heartbeat 5 192.168.1.101 host node IP address 6 Bizcluster 192.168.1.99 Biztalk cluster IP Address the same IP address can be used in a Windows Cluster 7 dtccluster 1

Keepalived + redis implement high-availability automatic failover and keepalivedfailoverKeepalived + redis for high-availability automatic failoverInstall redis and keepalived on server A (10.0.11.2) and server B (10.0.12.2)A is the default master and B is the slave (add SLAVEOF 10.0.11.2 6379 TO THE redis configuration file ).Redis on A and B All enable localization policies. Appendonly yesContents of the keepalived configuration file for server A --

Apsara stack Software announced on September May 18 that, the US Patent and Trademark Office has officially approved the "System and Method for fiber Channel failure switching systems and solutions Through Port Spoofing technology (Fail-Over Through Port Spoofing) the U.S. patent number is 6,715,098. The application for this patent further reinforces the leading position of Apsara stack in the disaster recovery and business continuity field of the storage market. Apsara stack software developmen