topic Re: RHEL 5.5 LVM Filter in Operating System - Linux

RHEL 5.5 LVM Filter

Mike_Swift — Tue, 22 Nov 2011 14:26:10 GMT

I have two filters in place for different boxes and i would like to know whcih one is better and why? Idea is to filter emc devices. Could someone tell me the advantage/disadvantage of using a comma before the " r " (like on the second filter as opposed to the first one?

filter = [ "a|/dev/emcpower.*|" "r|/dev/sd*|" ]

filter = [ "a|/dev/emcpower.*|", "r|.*|" ]

Thanks

Mike.

Re: RHEL 5.5 LVM Filter

Matti_Kurkela — Thu, 24 Nov 2011 04:37:11 GMT

"man lvm.conf" explicitly says "Elements must be separated by commas" when it describes the "array" syntax, which is used in the filter specification.

So only the second one is valid according to the documented syntax. The first one may or may not work; but if it works, it works because of an undocumented feature which may or may not be there in the next version/patchlevel.

Re: RHEL 5.5 LVM Filter

Mike_Swift — Mon, 28 Nov 2011 19:31:29 GMT

Thanks Matti! BTW what does the ", r" mean, meaning every devices (raw)?

Thanks

Mike