| From: | "Luke Lonergan" <llonergan(at)greenplum(dot)com> |
|---|---|
| To: | "Miguel" <mmiranda(at)123(dot)com(dot)sv>, "Vivek Khera" <vivek(at)khera(dot)org> |
| Cc: | "Postgresql Performance" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Best OS & Configuration for Dual Xeon w/4GB & |
| Date: | 2006-03-20 20:59:13 |
| Message-ID: | C04457A1.1F924%llonergan@greenplum.com |
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| Lists: | pgsql-performance |
Miguel,
On 3/20/06 12:52 PM, "Miguel" <mmiranda(at)123(dot)com(dot)sv> wrote:
> i have a HP dl380 g3 with array 5i controlled (1+0), these are my results
Another "known bad" RAID controller. The Smartarray 5i is horrible on Linux
- this is the first BSD result I've seen.
> Seek times:
> Full stroke: 250 iter in 1.138232 sec = 4.553 msec
> Half stroke: 250 iter in 1.084474 sec = 4.338 msec
These seem OK - are they "access times" or are they actually "seek times"?
Seems like with RAID 10, you should get better by maybe double.
> Transfer rates:
> outside: 102400 kbytes in 2.075984 sec = 49326 kbytes/sec
> middle: 102400 kbytes in 2.100510 sec = 48750 kbytes/sec
> inside: 102400 kbytes in 2.042313 sec = 50139 kbytes/sec
>
>
> is this good enough?
It's pretty slow. How many disk drives do you have?
- Luke
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