postgres-xc-general Mailing List for Postgres-XC

Hi Koichi,

Not specifically PostgreSQL, using mysql, and we haven't benchmarked... 
We run an email marketing company (we basically DDOS ourselves by 
sending mails fast and receiving clicks back) and have about 20 pizzabox 
servers in one rack. Each pizzabox has about 5 VMs, most have an active 
db instance.

Using asynchronous DRBD, via a 1Gbps VPLS, we sync to the second 
location so we have a hot-standby for a server. The average traffic in 
our usecase is 100Mbps and we peak around 400Mbps during backups (the 
backupserver is also mirrored of course). I have _never_ seen issues 
with DRBD is this setting (and we failover regularly for maintenance of 
the hosts; only the VMs are synced). We used to have synchronous 
replication when the hosts were coupled together; no issues either. I 
have to say that our data is not required to be of 'bank quality' (using 
mysql/myisam will guarantee  that).

I have seen many more issues from upgrading from Debian Lenny to Debian 
Squeeze on our Dell R310. I/O performance seems to have lowered 
significantly, say 20% or 30% (more I/O related incidents since update). 
These are gut numbers because I have a hard time reproducing this (it 
only occurs when many users do many different things). We have not 
located that issue (to any driver, hw and/or kernel changes).

However. We basically are not using 50% of our hardware and it hurts my 
need for optimization.

David

On 11/06/2012 01:55 AM, Koichi Suzuki wrote:
> Does anybody has performance data for DRBD with PostgreSQL?   The
> following reports that the throughput will become almost half.
>
> http://archives.postgresql.org/pgsql-performance/2007-09/msg00118.php
>
> The article is posted about five years ago, though.
>
> Regards;
> ----------
> Koichi Suzuki
>
>
> 2012/11/6 Vladimir Stavrinov <vst...@gm...>:
>> On Mon, Nov 05, 2012 at 07:22:54PM +0300, Vladimir Stavrinov wrote:
>>
>>> solution is alliance of drbd + pacemaker + corosync. It is  very
>> Forgot to add in this team ipvs.
>>
>>
>> *****************************
>> ###  Vladimir Stavrinov
>> ###  vst...@gm...
>> *****************************
>>
>>
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