| 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 |
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| 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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