Date: Thu, 10 Oct 2002 18:45:22 +0200 (CEST) From: Attila Nagy <bra@fsn.hu> To: hackers@freebsd.org Subject: Sharing a SCSI bus between some computers Message-ID: <Pine.LNX.4.44.0210101808560.3631-100000@scribble.fsn.hu>
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Hello,
Due to the lack of enough "networking power" I started to think about
alternatives.
I would like to ask your thoughts on the following setup:
+----------+ +----------+ +----------+
+ BOX1 +-------+ SCSI BOX +------+ BOX2 +
+----------+ +----++----+ +----------+
||
+----++----+
+ BOX3 +
+----------+
BOX[1-3] would be a PC with a SCSI adapter. SCSI BOX is an external SCSI
RAID array.
The line between the boxes is a single SCSI cable, on which the devices
access the bus (it would be a correct chain, with a terminator on each
end).
The question is:
what will happen if BOX3 mounts the filesystem from the SCSI BOX RW and
BOX[1-2] mount it RO?
In the case BOX[1-2] it is only necessary to read from the array, nothing
more.
I've seen a similar setup on Sun hardware, where the disk array was used
by two computers. RW/RO, as in this case.
Does anybody have experiences regarding this? Is it possible/necessary to
hack some kind of locking into the SCSI driver? The adapters are made by
Adaptec (aic7xxx).
Thanks,
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Attila Nagy e-mail: Attila.Nagy@fsn.hu
Free Software Network (FSN.HU) phone @work: +361 210 1415 (194)
cell.: +3630 306 6758
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