Greetings,
I come here about once a year looking for help understanding LVM filtering with
DRBD. I've read the relevant sections of the DRBD User Guide, visited various
web sites, and spoken to people in the list, but I'm still looking for a simple
rule of thumb.
Basically, here is what I've come to understand:
1. If DRBD lives *above* an LVM volume, then the default LVM filtering
settings are fine; no changes are required to lvm.conf. The LVs will remain
active on all DRBD nodes, and an LVM resource agent is not required.
1. If DRBD lives *below* or *between* LVM volumes, then:
* set global_filter to reject the DRBD backing devices
* set write_cache_state = 0
* set use_lvmetad = 0
* set volume_list to include block devices required to boot
* remove /etc/lvm/cache/.cache.
* run lvscan
* regenerate initrd
* reboot
* Use a cluster resource agent to activate/de-activate LVs as required
by cluster operation
Please feel free to correct any mistakes.
--Eric
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