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Volume Shadowing

 
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Robert Gezelter
Honored Contributor

Re: Volume Shadowing

Warren,

Re Jan's recent post.

My comment about gradualism truly applies here. The exact mechanics vary, but it is often possible to use the inherent "fault surviving" facets of OpenVMS clusters to avoid seeing any downtime in this situation. This once again means that the switchover can be gradual, greatly decreasing the business risks associated with the change in hardware.

I discussed this somewhat more extensively in my OpenVMS Technical Journal paper on "Strategies for Migrating from Alpha and VAX systems to HP Integrity Servers on OpenVMS", available from http://www.rlgsc.com/publications/vmstechjournal/migrationstrategies.html

Similar strategies are appropriate when changing hardware elements of your configuration.

- Bob Gezelter, http://www.rlgsc.com
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Martin Hughes
Regular Advisor

Re: Volume Shadowing

>> So, what happened to rolling upgrades? <<

My mistake, I should have said "shutdown" not "outage". I didn't mean to imply that a cluster outage was necessary.

The point I was trying to make is that each node needs to be shutdown and reconfigured so that you can subsequently boot and write crash dumps successfully.
For the fashion of Minas Tirith was such that it was built on seven levels, each delved into a hill, and about each was set a wall, and in each wall was a gate. (J.R.R. Tolkien). Quote stolen from VAX/VMS IDSM 5.2