We did investigate that for reduntant MQservers, the do have logs and queues in ordinary files, and if using duplicate redundant servers, this is a problem.
The HA-solution is complicated with lots of error sources (humans mostly) Our solution was : Always run MQ in only one of the two servers. When the servers boot, it first run a script, - vmcp LINK to a dasd write-mode with the files used on it - make it online - activate lvm volume - mount it The server that comes first can LINK, the other one can not. If it can, it can start MQ. Both servers have scripts to make the MQ LVM files online or offline. So we can easily and fast switch active MQ-server. The WAS servers (also two) is instructed to communicate with only the 'active' MQ server. Since a failure is so rare, this is done manually, only takes a couple of minutes. Works fine, is stable, and we run at full I/O speed, no NFS-locking or other network traffic. /Tore _________________________________________________ Tore Agblad System programmer, Volvo IT certified IT Architect Volvo Information Technology Infrastructure Mainframe Design & Development, Linux servers Dept 4352 DA1S SE-405 08, Gothenburg Sweden Telephone: +46-31-3233569 E-mail: [email protected] http://www.volvo.com/volvoit/global/en-gb/ -----Original Message----- From: Linux on 390 Port [mailto:[email protected]] On Behalf Of Marcy Cortes Sent: den 13 juli 2011 21:07 To: [email protected] Subject: Clustered file systems Will we ever have a posix compliant clustered file system for Linux on z? Is anyone else finding apps that need them and therefore can't be hosted on z? Marcy ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
