Hello everybody,
has someone used crm-fence-peer.sh for resource fencing with block-drbd
managed resources ?
Looking at the changelog I can see that in 8.3.7 it's supposed to work :
* crm-fence-peer.sh is now also usable if DRBD is managed from the xen
block helper script
But I've tried to figure out how this could be done looking at the
scripts (both block-drbd and crm-fence-peer) finding nothing that seems
related to this feature.
My drbd version is 8.3.7 (from sources)
crm is corosync 1.2.1 (from sources)
I have configured 'Xen only' resources at crm level, while drbd is
indirectly managed via block-drbd scripts.
my drbd resources are configured this way:
resource res1 {
device /dev/drbd1;
disk /dev/vhosts/res1;
meta-disk internal;
disk {
on-io-error detach;
fencing resource-only;
}
handlers {
split-brain "/usr/lib/drbd/notify-split-brain.sh root";
fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
after-resync-target "/usr/lib/drbd/crm-unfence-peer.sh";
}
syncer {
rate 40M;
}
net {
allow-two-primaries;
max-buffers 8000;
max-epoch-size 8000;
sndbuf-size 0;
}
on cl1 {
address 10.20.30.41:7789;
}
on cl2 {
address 10.20.30.42:7789;
}
}
The question is : is this supposed to work with drbd 8.3.7 ?
Or the crm-fence-peer scripts needs an explicit drbd resource in cib to
operate with ?
In second case can I still use Xen resources with drbd-block.sh adding
to cib the relative drbd resources or I need to go for a completely
crm-managed resource group?
Lastly, with this setup in case of io-error on a host with primary state
resource the manual says the resource will be detached and will "run
diskless", but I can't figure out if the process of promoting the drbd
resource to primary on the peer and starting the xen host is intended to
be automatically managed by crm-fence scripts or if I must configure
some other scripts to obtain the following result :
1) io failure on host cl1 (local disk failure) with res1=Primary on it
2) on-io-error detach detaches resource from device on cl1 - go Diskless
3) cl2 notifies crm of cl1 failure (how?)
4) crm starts res1 on cl2
Many thanks in advance.
Sauro Saltini.
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