Date: Mon, 18 Jan 1999 12:54:49 -0800 From: Bill Trost <trost@cloud.rain.com> To: current@FreeBSD.ORG Subject: Re: mounting double-ended SCSI disks Message-ID: <47216.916692889@grey.cloud.rain.com> In-Reply-To: Your message of Sat, 16 Jan 1999 02:20:06 PST. <199901161020.CAA47520@silvia.hip.berkeley.edu> References: <199901161020.CAA47520@silvia.hip.berkeley.edu>
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Satoshi Asami writes:
However, if I try to mount it from B read-only while A is mounting
it read-write, it succeeds. This looks dangerous, as A writing data
onto the disk could cause B's cache to go stale without B knowing
it.
Just about as dangerous al letting A mount it read-only, and then B
mounting it read-write. Only in this case, nobody has a chance to know
that something is amiss, and since you probably are letting this happen
automatically at OS startup, the chances of a RO mount being followed by
a RW one are about the same as the other way 'round.
You're going to have the problem regardless of whether mount pays
attention to the clean flag. If you are worried about a RO mount
getting corrupted, don't modify the partition out from under it on
another machine.
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