[Gluster-users] Write performance in a replicated/distributed setup with KVM?

[Harald Hannelius]

On Fri, 2 Mar 2012, Bryan Whitehead wrote:

> I'd try putting all hostnames in /etc/hosts. Also, can you post ping times
> between each host ?

They are in /etc/hosts.

# ping6 -c3 alcippe
PING alcippe(alcippe) 56 data bytes
64 bytes from alcippe: icmp_seq=1 ttl=64 time=0.160 ms
64 bytes from alcippe: icmp_seq=2 ttl=64 time=0.088 ms
64 bytes from alcippe: icmp_seq=3 ttl=64 time=0.150 ms

--- alcippe ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.088/0.132/0.160/0.034 ms

  # ping6 -c3 aethra
PING aethra(aethra.arcada.fi) 56 data bytes
64 bytes from aethra.arcada.fi: icmp_seq=1 ttl=64 time=0.154 ms
64 bytes from aethra.arcada.fi: icmp_seq=2 ttl=64 time=0.158 ms
64 bytes from aethra.arcada.fi: icmp_seq=3 ttl=64 time=0.164 ms

--- aethra ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.154/0.158/0.164/0.015 ms

# ping6 -c3 adraste
PING adraste(adraste) 56 data bytes
64 bytes from adraste: icmp_seq=1 ttl=255 time=0.165 ms
64 bytes from adraste: icmp_seq=2 ttl=255 time=0.155 ms
64 bytes from adraste: icmp_seq=3 ttl=255 time=0.187 ms

--- adraste ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.155/0.169/0.187/0.013 ms

As said before, I don't think there's a problem with the LAN. Trust me, I 
would know about it :)

> 
> 
> On Fri, Mar 2, 2012 at 8:55 AM, Harald Hannelius <harald.hannelius at arcada.fi>
> wrote:
>
>       On Fri, 2 Mar 2012, Brian Candler wrote:
>
>       On Fri, Mar 02, 2012 at 05:25:18PM +0200, Harald Hannelius
>       wrote:
>             I'll have to test with just a two-way replica,
>             and see if I get
>             better performance out of that. I'm gonna loose
>             the capability to
>             have one node at the other site then
> 
>
>       Ah... are these nodes separated by a WAN? Synchronous
>       replication is pretty
>       sensitive to latency.  You might want to look at
>       geo-replication instead
>       (which I've not tested)
> 
> 
> No, it's a 1 Gbps LAN. The other "site" is within LAN-range.
> 
> --
> 
> Harald Hannelius | harald.hannelius/a\arcada.fi | +358 50 594 1020
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> 
> 
>

-- 

Harald Hannelius | harald.hannelius/a\arcada.fi | +358 50 594 1020