[DRBD-user] DRBDv9 - some questions

Gandalf Corvotempesta gandalf.corvotempesta at gmail.com
Thu Sep 28 14:31:55 CEST 2017

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Hi to all,
Some questions about DRBDv9 (i'm really new to DRBD and DRBDv9 seems
to be a major refactor):

Let's assume a 3-node cluster

a) should I use RAID or creating resources on raw-disks would be ok?
b) can I use ZFS on top of DRBD ?
c) what if I have to aggragate multiple resources to increase spaces ?
Can I use LVM with something like this:

pvcreate /dev/drbd0
pvcreate /dev/drbd1
vgcreate vg0 /dev/drbd0 /dev/drbd1
lvcreate .......

to create a single LV on top of 2 drbd resources ?

d) what If node0.disk0 on resource0 will fail and node0.disk1 on
resource1 don't?
My LV spawning both resource will still work as expect but in a little
bit slow mode as drbd has to fetch missing data (due to failed disk0)
from one of the other peer ?

e) AFAIK drbd is a network block device, to access this "block device"
should I put an NFS/iSCSI/Whatever in front of it or are there
something integrated in drbd ? (Like NFS inside Gluster)

f) a 3node cluster is still subject to splitbrain ?



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