[Gluster-users] Gluster on ZFS with Compression

[Frank Rothenstein]

Hi,

I'm actually doing this on a pretty much similar system. I'm using
ovirt with KVM, RAIDZ on 4 disks with LZ4 and also dedup. My brick
-nodes are also ovirt-Nodes (VM-Hosts), and have 32/48 GB RAM. ZFS may
use up to 18GB of it, so a little more than your setup. ovirt needs
rep=3, i have 3 bricks per node.
I have no complaints about speed, ovirt is using thin provisioned vm
-disks as one big file per disk, self heal operations do need their
time but with little impact as far as i have seen. Performance is all
about network speed i would say. Running VMs directly on the bricks may
improve your VMs by using L2ARC...

Frank

Am Mittwoch, den 30.09.2015, 15:00 +1000 schrieb Lindsay Mathieson:
> I'm revisiting Gluster for the purpose of hosting Virtual Machine
> images (KVM). I was considering the following configuration
> 
> 2 Nodes
> - 1 Brick per node (replication = 2)
> - 2 * 1GB Eth, LACP Bonded
> - Bricks hosted on ZFS
> - VM Images accessed via Block driver (gfapi)
> 
> ZFS Config:
> - Raid 10
> - SSD SLOG and L2ARC
> - 4 GB RAM
>  - Compression (lz4)
> 
> Does that seem like an sane layout?
> 
> Question: With the gfapi driver, does the vm image appear as a file
> on the host (zfs) file system?
> 
> 
> Background: I currently have our VM's hosted on Ceph using a similar
> config as above, minus zfs. I've found that the performance for such
> a small setup is terrible, the maintenance headache is high and when
> a drive drops out, the performance gets *really* bad. Last time I
> checked, gluster was much slower at healing large files than ceph,
> I'm hoping that has improved :)
> 
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users



 

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