Multipath configure
Can you add multipath to an established system that is already configured with lvm? If so how?
Thanks in advance
Responses
What is your current setup? (i.e. do you have multipath paths available, but configured LVM to use /dev/sd*? And, are they fiber-channel?) I assume that your OS is on internal/local devices. In some cases you have to specifically be sure to exclude them in your /etc/multipath.conf (Dell Perc controllers, for example)
http://initrd.org/wiki/Device_Mapper_Multipath
blacklist {
device {
vendor "*"
product "PERC|Perc"
}
}
I believe you should be fine - of course, make sure that you:
* have backups (of your data and of /etc/lvm)
* review the recommended best-practices from your storage vendor on how configure /etc/multipath.conf
* plan on having an opportunity to reboot
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/pdf/DM_Multipath/Red_Hat_Enterprise_Linux-6-DM_Multipath-en-US.pdf
LVM is pretty intelligent in finding all the devices dynamically - but you may have to tweak your multipath.conf if your devices are not discovered or lvm.conf if your devices end up being excluded/ignored.
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