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Date:      Tue, 7 Dec 1999 21:02:20 -0500
From:      Greg Lehey <grog@mojave.sitaranetworks.com>
To:        "Justin T. Gibbs" <gibbs@FreeBSD.ORG>, Matthew Dillon <dillon@apollo.backplane.com>
Cc:        Julian Elischer <julian@whistle.com>, Mike Smith <msmith@FreeBSD.ORG>, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject:   Re: cvs commit: src/sys/kern kern_shutdown.c
Message-ID:  <19991207210220.00705@mojave.sitaranetworks.com>
In-Reply-To: <199912071505.IAA00369@caspian.plutotech.com>; from Justin T. Gibbs on Tue, Dec 07, 1999 at 08:05:24AM -0700
References:  <199912070829.AAA75674@apollo.backplane.com> <199912071505.IAA00369@caspian.plutotech.com>

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On Tuesday,  7 December 1999 at  8:05:24 -0700, Justin T. Gibbs wrote:
>> :This is basically what we decided was needed in discussion with Kirk to
>> :make Soft Updates safe. (The whole point).
>> :
>> :Julian
>>
>>    The disk can lie about whether it has written data to the disk without
>>    messing softupdates up, but it cannot reorder writes that the system has
>>    told it must be ordered.  SCSI has a tag to guarentee ordering (or not),
>>    but I don't know if IDE has the same sort of feature.
>>
>>						-Matt
>
> My understanding is that the ordered tag may go away in the near SCSI
> future.  I think this is absurd personally, but the makers of cheap
> disks are making a big push for this.

Given its weaknesses, I'm not too concerned.

Greg
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