wan failover

15.6 Upgrading AlwaysOn Failover Clusters15.6.1 PrerequisitesThe prerequisites for upgrading an FCI (failover cluster instance) are roughly the same as for upgrading a standalone instance.You cannot upgrade a standalone instance to an FCI. If you need to upgrade a standalone instance of SQL Server to an FCI, you must do so by following these steps.(1) Install the FCI.(2) Migrating the user database database

If we want to ensure high availability of SQL Server, we can adopt a Failover cluster. The simplest failover cluster is two servers, one active server and the other standby server. This is the cluster in AP mode. Another mode is the AA mode, that is, both servers are running SQL Server instances. SQL Server does not have RAC like Oracle, so it is impossible to say that the two servers run the same instanc

Label:1.failover Pre-check#如果有多个standby数据库 to see which standby received the latest redo. sql> SELECT * from V$archive_dest_status; #查看standby库接收到的最新的SCN sql> Select thread#,sequence#, Last_change#,last_time from V$standby_log; thread# sequence# last_change# last_time ---------------------------------------------- 1 7128 126385274 2 May-April -16 1 0 0 1 0 0 sql> 2. Exe

Before creating an SQL Server 2000 failover cluster, you must Configure Microsoft cluster service (MSC) and use the Cluster Administrator in Microsoft Windows NT4.0 or Windows 2000 to create at least one cluster disk resource. Before running the SQL Server installer, log on to the Cluster Administrator to locate the cluster drive, because this information is required to create a Failover cluster. 1. on the

15.5 Remove AlwaysOn Failover clusters15.5.1 PrerequisitesTo remove an AlwaysOn failover cluster, you must use the permissions of the local administrator and the permissions for all nodes that are logged on to the failover cluster.You must run the SQL Server Setup Wizard from each node of an AlwaysOn failover cluster t

=> 180, 7 failover_delay => 5 ); 8 end; 9/ PL/SQL procedure successfully completed. SQL> select name, failover_method, failover_type, goal, clb_goal from dba_services 2 where name = 'taf '; NAME FAILOVER_METHOD FAILOVER_TYPE GOAL CLB_G ------------------------------------------------------------------------ TAF BASIC SELECT LONG SQL> ho lsnrctl status .......... Service "TAF" has 1 instance (s ). Instance "GOBO4A", status READY, has 2 handler (s) for this service... The command completed su

Today, we demonstrated the switching process between switchover and failover on the virtual machine. The customer is concerned with failover. We directly turn off the virtual storage switch to simulate array faults. Failover steps are as follows: 1. select NAME,RESETLOGS_TIME,LOG_MODE,OPEN_MODE,PROTECTION_MODE,REMOTE_ARCHIVE, DATABASE_ROLE,SWITCHOVER_STATUS,FORC

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

Tags: problem eth delay NEC System Environment file RET Unable to attach load Java Oracle thin and OCI connectivity for failover of multiple databases First, Thin way This method is easy to use and is not uncommon.The URL isjdbc:oracle:thin:@ (description= (Load_balance=on)(Address= (PROTOCOL=TCP) (host=127.0.0.1) (port=1521))(Address= (PROTOCOL=TCP) (host=10.132.111.14) (port=1521))(Connect_data= (service_name=busi_db))) The load_balance=on indicates

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

Mysql high-availability architecture MHA setup and test failover MHA project website Https://code.google.com/p/mysql-master-ha/ 1. environment introduction 1. host deployment Manager: 10.10.54.154Master: 10.10.54.156Server load balancer 1: 10.10.54.155 (backup master) Server load balancer: 10.10.54.157 2. general stepsA. First, use ssh-keygen to achieve mutual key-free login between the four hostsB. install MHAmha4mysql-node, mha4mysql-manager softwa

ProspectThe company built 2012 DHCP and configured the failover, all functions OK. Suddenly found that the address pool is not enough, the original is because the rejected phone in the filter is not synced to another, resulting in a phone connection, consuming a large number of IP addresses. So how do we get this in sync? The idea is simple. Export this list before the main, and then import the new one. Just no graphical import, so use a script to let

These two days in a detailed look at the man carp document. found that the original carp can not only achieve failover (failover) cluster, through a simple configuration or can be a local LAN load balance. Carp load Balancing uses the Arpbalance function, which is understood literally as the use of ARP load balancing, that is, the second layer of the OSI7 layer model-the data link layer. Therefore, using a

Tags: mysql master-slave failover A: Environment 192.168.1.100master 192.168.1.101slave1 192.168.1.102slave2 slave1,slave2 are all connected to the master. II: Simulate master failure Close Master Instance servicemysqlstop at this point, showslavestatus\g on Slave1,slave2 will find an error: Last_ Io_error:errorreconnectingtomaster ' [emailprotected]:3307 ' -retry-time : 60retries:1 IO process and SQL process status: slave_io_running:connecting (t