Steps to convert Cache storage from JFS to JFS2

[Joe Wolken]

I support the CMOD Administration, but am looking for advice regarding the underlying steps to convert the Cache storage from JFS to JFS2.  I was hoping someone could review the summary detail I got from the UNIX support team to see if these steps make sense or need changing.  We are hoping to do this in a Non-Prod environment before replicating the steps in Prod.

Step 1 : stop the CMOD application.

step 2 : create new filesystem (JFS2 )with new name.

step 3 : rsync the data from old filesystem to new filesystem

step 4 : unmount both filesystems and update the /etc/filesystem

step 5 : Rename the lvs and mount the filesystem

step 6 : Start and validate the application.

step 7 : after validation, remove the old filesystem

 
Any advice would be appreciated.

Thanks,

[Justin Derrick]

First, before any of this I'd be running arsmaint -v (cache validation) and address - or at least document - any errors it reports.  I'd get started on doing this in prod now -- it can take a lot of time to repair manually.

For step 4/5, you don't need to rename the logical volumes, just mount the new lv at the old mountpoint.

And, of course, run the cache validation again as part of Step 7 while you're doing end-user testing.

Otherwise, the plan looks good!

-JD.