zeldor.biz

Linux, programming and more

Pacemaker: fix timeout warnings

by 3 Comments

Sometimes if you add a new resource or change something in your cluster configuration you get some warnings like this one.

Or if you run a configuration syntax check:

1

root@node1:~# crm configure verify
1
2
3
4
5
6
7

crm(live)configure# verify 
WARNING: mount_srv: default timeout 20s for start is smaller than the advised 60
WARNING: mount_srv: default timeout 20s for stop is smaller than the advised 60
WARNING: drbd_r0: default timeout 20s for start is smaller than the advised 240
WARNING: drbd_r0: default timeout 20s for stop is smaller than the advised 100
WARNING: pingnet: default timeout 20s for start is smaller than the advised 60
WARNING: pingnet: default timeout 20s for monitor_0 is smaller than the advised 60

Solution: define new operations, use the same times 240s and 100s
op start interval=”0″ timeout=”240s”
op stop interval=”0″ timeout=”100s”

Config snippet:

1
2
3
4
5

primitive drbd_r0 ocf:linbit:drbd \
        params drbd_resource="drbd0" \
        op monitor interval="120s" \
        op start interval="0" timeout="240s" \
        op stop interval="0" timeout="100s"

Really dirty fix (set global timeouts):

1

crm configure property default-action-timeout="240"

DRBD set sync speed

by 1 Comment

The default sync rate is normally defined in your drbd configuration (mostly /etc/drbd.conf)

1
2
3

syncer {
    rate 100M; 
}

If you are setting up a virtual machine on drbd cluster you need to produce more I/O and your physical machines are under heavy load. You can stop some services or you can reduce the sync rate.

Set temporary sync rate:
You need to issue this command only on one of your nodes!

1

root@drbd-node1:~# drbdsetup /dev/drbd0 syncer -r 10M

Enjoy the easy solution;)

File systems part III – cluster filesystems

by Leave a Comment


GFS2 – the Global File System
Very responsive on large files.

It allows a cluster of computers to simultaneously use a block device that is shared between them (with FC, iSCSI, NBD, etc…). GFS reads and writes to the block device like a local filesystem, but also uses a lock module to allow the computers coordinate their I/O so filesystem consistency is maintained.
[Read more…]