| From: | Gavin Flower <GavinFlower(at)archidevsys(dot)co(dot)nz> |
|---|---|
| To: | Lee Nguyen <leemobile(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Postgresql in a Virtual Machine |
| Date: | 2013-11-25 20:08:14 |
| Message-ID: | 5293AE2E.5020405@archidevsys.co.nz |
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| Thread: | |
| Lists: | pgsql-performance |
On 26/11/13 09:01, Lee Nguyen wrote:
> Hi,
>
> Having attended a few PGCons, I've always heard the remark from a few
> presenters and attendees that Postgres shouldn't be run inside a VM.
> That bare metal is the only way to go.
>
> Here at work we were entertaining the idea of running our Postgres
> database on our VM farm alongside our application vm's. We are
> planning to run a few Postgres synchronous replication nodes.
>
> Why shouldn't we run Postgres in a VM? What are the downsides? Does
> anyone have any metrics or benchmarks with the latest Postgres?
>
> Thanks!
>
> Lee Nguyen
I suspect that it is a performance and reliability issue that affects
any ACID database.
AFAIK, in a VM there is less certainty as to when a disk I/O is actually
complete and safely on the disk.
I think vm's are probably fine for testing, but not for production.
Cheers,
Gavin
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