[Gluster-users] Replica 2 heal blocks virtual machines

[Ravishankar N]

https://www.mail-archive.com/gluster-users@gluster.org/msg19152.html maybe?


On 03/20/2015 01:37 PM, Alexander Marx wrote:
> Dear List!
>
> I am running a proxmox cluster (3 nodes).
> 2 of them are acting as glusterfs servers (Version 3.6.2-2) and have a 
> 16 TB share (XFS) each
>
> I am running virtual machines on the cluster and i have a really big 
> vm fileserver running (2 virtual disks a 1 TB).
> Now i had to reboot one of the nodes and it came up right after 5 
> minutes. At this time, the vm fileserver was running.
>
> After the node came back up, it took a few minutes, then the vm got 
> unresponsible. The Disks of the two glusternodes where blinking and
> a selfheal was started.
>
> Is there a way to make the selfheal process NOT blocking the vm? Is 
> there an option to let gluster do the selfheal in background?
>
> I have no options configured in either /etc/gluster/glusterd.vol or 
> any volumes, just plain glusterfs installation.
>
> The nodes are all connected via 10Gbit ethernet and i have only one 
> network cable on each server and a 10Gbit switch.
>
> The pure raid performance is good so far, i can write to mounted 16TB 
> partition (raid5, 4 6TB HDD) with dd with about 400-500 MB/sec
> I can also write to mounted glustervolume /mnt/pve/gluster with about 
> 200 MB/sec.
>
> Are there any tuning options to make the glusterfs faster and let it 
> do the heal nonblocking in background?
>
> We are running about 12 Windows terminalservers on this cluster and 
> several linux machines (DB,Mail and so on)
>
> It is really bad if the whole system "hangs" when a heal is running.
>
> Thank you
>
> Alex
>
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