Re: suggestions for postgresql setup on Dell 2950 , PERC6i controller - Mailing list pgsql-performance

From Matt Burke
Subject Re: suggestions for postgresql setup on Dell 2950 , PERC6i controller
Date
Msg-id 498BF595.7010503@icritical.com
Whole thread Raw
In response to Re: suggestions for postgresql setup on Dell 2950 , PERC6i controller  (Rajesh Kumar Mallah <mallah.rajesh@gmail.com>)
List pgsql-performance
Rajesh Kumar Mallah wrote:
>> I've checked out the latest Areca controllers, but the manual
>> available on their website states there's a limitation of 32 disks
>> in an array...
>
> Where exactly is there  limitation of 32 drives. the datasheet of
> 1680 states support upto 128drives using enclosures.

The 1680 manual:
http://www.areca.us//support/download/RaidCards/Documents/Manual_Spec/SAS_Manual.zip

Page 25:

> Note:
>
> 1. The maximum no. is 32 disk drived included in a single RAID set

Page 49:

> 1. Up to 32 disk drives can be included in a single RAID set.
> 2. Up to 8 RAID sets can be created per controller

(point 2 meaning you can't do s/w RAID over umpteen h/w RAID1 pairs)

Page 50:

> To create RAID 30/50/60 volume, you need create multiple RAID sets
> first with the same disk members on each RAID set. The max no. disk
> drives per volume set: 32 for RAID 0/1/10/3/5/6 and 128 for RAID
> 30/50/60.

...and a few more times saying the same thing

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