Re: Advice on RAID card - Mailing list pgsql-performance

From Dave Cramer
Subject Re: Advice on RAID card
Date
Msg-id ABE6B997-2C1E-43B1-9F18-28F54B1620FE@fastcrypt.com
Whole thread Raw
In response to Re: Advice on RAID card  (Michael Ben-Nes <miki@canaan.co.il>)
Responses Re: Advice on RAID card
Re: Advice on RAID card
Re: Advice on RAID card
List pgsql-performance
I would think software raid would be quite inappropriate considering
postgres when it is working is taking a fair amount of CPU as would
software RAID. Does anyone know if this is really the case ?

Dave
On 25-Sep-05, at 6:17 AM, Michael Ben-Nes wrote:

> I would consider Software Raid
>
>
> PFC wrote:
>
>
>>
>>     Hello fellow Postgresql'ers.
>>
>>     I've been stumbled on this RAID card which looks nice. It is a
>> PCI-X SATA  Raid card with 6 channels, and does RAID  0,1,5,10,50.
>>     It is a HP card with an Adaptec chip on it, and 64 MB cache.
>>
>>     HP Part # : 372953-B21
>>     Adaptec Part # : AAR-2610SA/64MB/HP
>>
>>     There' even a picture :
>>     http://megbytes.free.fr/Sata/DSC05970.JPG
>>
>>     I know it isn't as good as a full SCSI system. I just want to
>> know if  some of you have had experiences with these, and if this
>> cards belong to  the "slower than no RAID" camp, like some DELL
>> card we often see mentioned  here, or to the "decent performance
>> for the price" camp. It is to run on a  Linux.
>>
>>     Thanks in advance for your time and information.
>>
>> ---------------------------(end of
>> broadcast)---------------------------
>> TIP 4: Have you searched our list archives?
>>
>>               http://archives.postgresql.org
>>
>
>
> --
> --------------------------
> Canaan Surfing Ltd.
> Internet Service Providers
> Ben-Nes Michael - Manager
> Tel: 972-4-6991122
> Cel: 972-52-8555757
> Fax: 972-4-6990098
> http://www.canaan.net.il
> --------------------------
>
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
>       choose an index scan if your joining column's datatypes do not
>       match
>
>


pgsql-performance by date:

Previous
From: Michael Ben-Nes
Date:
Subject: Re: Advice on RAID card
Next
From: Mike Rylander
Date:
Subject: Re: Advice on RAID card