| From: | "Luke Lonergan" <llonergan(at)greenplum(dot)com> |
|---|---|
| To: | "Michael Stone" <mstone+postgres(at)mathom(dot)us> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Hardware/OS recommendations for large databases ( |
| Date: | 2005-11-15 18:47:59 |
| Message-ID: | BF9F6D5F.13B4E%llonergan@greenplum.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
Mike,
On 11/15/05 6:55 AM, "Michael Stone" <mstone+postgres(at)mathom(dot)us> wrote:
> On Tue, Nov 15, 2005 at 09:33:25AM -0500, Luke Lonergan wrote:
>> >write performance is now up to par with the best cards I believe. We
>> >find that you still need to set Linux readahead to at least 8MB
>> >(blockdev --setra) to get maximum read performance on them, is that your
>
> What on earth does that do to your seek performance?
We¹re in decision support, as is our poster here, so seek isn¹t the issue,
it¹s sustained sequential transfer rate that we need. At 8MB, I¹d not
expect too much damage though the default is 1.5MB.
- Luke
>
| From | Date | Subject | |
|---|---|---|---|
| Next Message | William Yu | 2005-11-15 18:57:05 | Re: Hardware/OS recommendations for large databases ( 5TB) |
| Previous Message | Luke Lonergan | 2005-11-15 18:46:12 | Re: Hardware/OS recommendations for large databases ( |