[EMAIL PROTECTED] wrote:
>
> Hi,
>
> I've been fooling around with raid-tools in combination with the promise
> ultra/66 controller together with a couple of IBM desk-star 22 Gb disks.
>
> And I really like what I see.
>
> My main concern now is about how far these things will scale.
>
> When reading /usr/src/linux/Documentation/devices.txt it seems to be limited
> support for having *many* ide hard disks. The MAKEDEV script seems to concur.
> When using the "general ide udma" patch I found the scripts
> MAKEDEV-IDE{45,67} which is good. No extended documentation suggesting how
> many ide disks that are supported
>
> But, if I would like to have a server using let's say, 5 ultra/66
> controllers, and the motherboard itself has 4 ide channels. This would give
> me 14 ide channels, and a maximum of 28 hard disks (No, I don't intend to use
> that many. 1 disk / ide channel for performance reasons).
>
> How many ide disks is it possible to use under linux, and how many is it
> "recommended" to use?
>From /usr/src/linux/drivers/block/ide.h:
/*
* This is the multiple IDE interface driver, as evolved from hd.c.
* It supports up to four IDE interfaces, on one or more IRQs (usually
14 & 15).
* There can be up to two drives per interface, as per the ATA-2 spec.
*
* Primary i/f: ide0: major=3; (hda) minor=0; (hdb)
minor=64
* Secondary i/f: ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b)
minor=64
* Tertiary i/f: ide2: major=33; (hde) minor=0; (hdf)
minor=64
* Quaternary i/f: ide3: major=34; (hdg) minor=0; (hdh)
minor=64
*/
--
Lee Heath (aka MadHat)
"The purpose of life is not to see how long you can keep doing it. It's
to see how well you can do it. There are things worse than death, and
chief among them is living without honor." -- Woodchuck, DC-stuff list
