Re: Postgresql Performance on an HP DL385 and

Steve,

If this is an internal RAID1 on two disks, it looks great.

Based on the random seeks though (578 seeks/sec), it looks like maybe it's 6
disks in a RAID10?

- Luke

On 8/16/06 7:10 PM, "Steve Poe" <steve(dot)poe(at)gmail(dot)com> wrote:

> Everyone,
>
> I wanted to follow-up on bonnie results for the internal RAID1 which is
> connected to the SmartArray 6i. I believe this is the problem, but I am
> not good at interepting the results. Here's an sample of three runs:
>
> scsi disc
> array ,16G,47983,67,65492,20,37214,6,73785,87,89787,6,578.2,0,16,+++++,
> +++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
> scsi disc
> array ,16G,54634,75,67793,21,36835,6,74190,88,89314,6,579.9,0,16,+++++,
> +++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
> scsi disc
> array ,16G,55056,76,66108,20,36859,6,74108,87,89559,6,585.0,0,16,+++++,
> +++,+++++,+++,+++++,+++,+++++,+++,+
>
> This was run on the internal RAID1 on the outer portion of the discs
> formatted at ext2.
>
> Thanks.
>
> Steve
>
> On Thu, 2006-08-10 at 10:35 -0500, Scott Marlowe wrote:
>> On Thu, 2006-08-10 at 10:15, Luke Lonergan wrote:
>>> Mike,
>>>
>>> On 8/10/06 4:09 AM, "Michael Stone" <mstone+postgres(at)mathom(dot)us> wrote:
>>>
>>>> On Wed, Aug 09, 2006 at 08:29:13PM -0700, Steve Poe wrote:
>>>>> I tried as you suggested and my performance dropped by 50%. I went from
>>>>> a 32 TPS to 16. Oh well.
>>>>
>>>> If you put data & xlog on the same array, put them on seperate
>>>> partitions, probably formatted differently (ext2 on xlog).
>>>
>>> If he's doing the same thing on both systems (Sun and HP) and the HP
>>> performance is dramatically worse despite using more disks and having faster
>>> CPUs and more RAM, ISTM the problem isn't the configuration.
>>>
>>> Add to this the fact that the Sun machine is CPU bound while the HP is I/O
>>> wait bound and I think the problem is the disk hardware or the driver
>>> therein.
>>
>> I agree. The problem here looks to be the RAID controller.
>>
>> Steve, got access to a different RAID controller to test with?
>>
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>