| From: | Markus Schiltknecht <markus(at)bluegap(dot)ch> |
|---|---|
| To: | Hannu Krosing <hannu(at)skype(dot)net> |
| Cc: | Fujii Masao <fujii(dot)masao(at)oss(dot)ntt(dot)co(dot)jp>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Replication |
| Date: | 2006-08-23 11:09:36 |
| Message-ID: | 44EC3770.5070400@bluegap.ch |
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| Lists: | pgsql-hackers |
Hannu Krosing wrote:
> But any sync _replication_ system will have severe impact on
> performance. My guess is that for a full sync replication, going from 1
> server to 2 will actually lower performance andsome small gains would be
> possible only starting from 3rd server.
Only testing will show concrete results, but for sure such a general
answer does not make much sense. It all depends very much on the type of
your load. Especially the read/write ratio is very important. Another
important factor is the amount of conflicting transactions.
> My quess is based on using standard 100Gb ethernet. It may be possible
> to do better on some more advanced interconnects like myrinet.
100Gb ethernet already sounds very advanced... ;-)
Regards
Markus
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