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Re: What's the best hardver for PostgreSQL 8.1?

From: David Lang <dlang(at)invendra(dot)net>
To: Luke Lonergan <LLonergan(at)greenplum(dot)com>
Cc: Frank Wiles <frank(at)wiles(dot)org>, Juan Casero <caseroj(at)comcast(dot)net>,pgsql-performance(at)postgresql(dot)org
Subject: Re: What's the best hardver for PostgreSQL 8.1?
Date: 2005-12-25 12:13:57
Message-ID: Pine.LNX.4.62.0512250412020.2807@qnivq.ynat.uz (view raw or flat)
Thread:
Lists: pgsql-performance
On Sat, 24 Dec 2005, Luke Lonergan wrote:

> David,
>
>> now hot-swap may not be supported on all interface types, that may be what
>> you have run into, but with SCSI or SATA you should be able to hot-swap
>> with the right controller.
>
> That's actually the problem - Linux hot swap is virtually non-functional for SCSI.  You can write into the proper places in /proc, then remove and rescan to get a new drive up, but I've found that the resulting OS state is flaky.  This is true of the latest 2.6 kernels and LSI and Adaptec SCSI controllers.
>
> The problems I've seen are  with Linux, not the controllers.

Thanks for the clarification, I knew that PATA didn't do hotswap, and I've 
seen discussions on the linux-kernel list about SATA hotswap being worked 
on, but I thought that scsi handled it. how recent a kernel have you had 
problems with?

David Lang

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