Filter disks that underlie the Multipath devices.
"When you create an LVM logical volume that uses active/passive multipath arrays as the underlying
physical devices, you should include filters in the lvm .conf to exclude the disks that underlie the
multipath devices. T his is because if the array automatically changes the active path to the passive path when it receives I/O, multipath will failover and failback whenever LVM scans the passive path if these
devices are not filtered. For active/passive arrays that require a command to make the passive path
active, LVM prints a warning message when this occurs."
I don't quite understand this. Why should we filter this since we have a blacklist in multipath.conf file and filter what?
Can anyone help me understand this?
And also how to configure multipath to active/passive or active/active mode? what is the default mode?
Thanks in advance.
Last edited by hilou; 08-05-2013 at 11:04 PM.