More than 8 firewire devices?
From: Johann Horvat (horvat.johann_at_gmx.net)
Date: 02/28/05
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Date: Mon, 28 Feb 2005 11:21:15 +0100
Hi there!
I'm using Debian Sarge, kernel 2.6.x, several mainboards wit P-IV's and
several IEEE1394 host controllers with maxtor one-touch (160 or 250 GB
devices).
For example: Fujitsu-Siemens D1688 with 6 Adaptec Fireconnect 4300 (->
18 IEEE1394 connectors + 1 from mainboard)
But something seems to limit it up to 8 devices, if I connect 9 or more,
that doesn't work...
Maybe the controller used indide the maxtor devices?
What am I doing wrong??
Thanx Johann
I sent this request to linux1394-user@lists.sourceforge.net and got this
answer (Thanx to Stefan Richter!!):
#Date: Wed, 23 Feb 2005 10:52:30 +0100
#From: Stefan Richter <stefanr@s5r6.in-berlin.de>
#Reply-To: linux1394-user@lists.sourceforge.net
#To: linux1394-user@lists.sourceforge.net
#Subject: Re: More than 8 devices?
#
#The spec allows up to 63 PHYs on every 1394 bus (1 PHY per disk except
#for dual-disk bridges, 1 PHY of the host adapter, some PHYs for hubs)
#and as much 1394 buses as the available PCI bus(es) allow. Of course
#there will be bandwidth bottlenecks of the 1394 and PCI buses during
#concurrent disk access. But the 1394 drivers should support this out of
#the box.
#
#However the sbp2 driver needs to create a virtual SCSI host for each
#disk. Maybe there is a limitation WRT device files? This may have to do
#with existing device files or devfs or a fixed maximum number of hosts
#in the main scsi driver... Such limit should be possible to extend. I
#dimly remember that there were discussions about some limitation in the
#past but do not know what the reason and cure were
What do you say?
Thanx Johann
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