On Mon, Apr 27, 2009 at 9:49 PM, kelsey hudson <khud...@drjays.com> wrote:
> [..trimming people who are on the list..]
>
> er krishna wrote:
>
>> Thanks, to all of you for this information. So now, what I can conclude
>> that we can connect 24 SATA hard disk having 2 TB capacity. Please confirm
>> weather we can reach beyond this limit.
>>
>
> you can always use multiple controller boards, and many of the controller
> boards support sata/sas expanders. These break out a single SAS/SATA
> connector into multiple host connectors, as SAS and SATA are buses, not
> ports.
>
> in the case of SAS, you can basically have 128 fanout expanders and 128
> edge expanders per host connector. That gets you 16384 disks per physical
> SAS connector.
>>>> This is clear and thanks for it. But Can SATA hard disks be connected
on SAS controller ? I don't hink our AoE will serve with SAS disks. Please
confirm it.
>
>
> In the case of SATA, you can get a 15-device breakout expander. This
> expander cannot be cascaded like SAS, so you're limited to 15 devices per
> connector (total).
>>> Just asking, here I am not clear. How many connectors I can connect ?
Each connector will have 15 disks capacity. Is there any way to connect more
than one connectors, what will be the maximum limit according to the
available solution in market. I am not concerned about theoretical limits.
>
>
> Note, however, that if you're using a "dumb" controller, it leaves it up to
> the OS to talk to the expander; in the case of Linux the expander support is
> rather weak. If you're using an intelligent controller like one of the Areca
> or 3ware RAID boards, the expander code is built-in to the firmware on the
> controller and abstracted away from the OS (as it should be -- if you're
> dealing with that many disks you want something with a more intelligent
> interrupt handler than x86, certainly).
>
> regards,
>
> --
> Kelsey Hudson
> Sr. Systems Administrator, DrJays.com
> 9180 Camino Santa Fe, San Diego, CA 92121
> 888.437.5297x134 (desk) 619.852.6374 (cell)
>
>
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